HomeMy Public PortalAboutOrd. 1691ORDINANCE NO. 1691
AN ORDINANCE OF THE CITY OF LYNWOOD ADOPTING THE 2016 EDITIONS OF
THE CALIFORNIA BUILDING CODE, THE CALIFORNIA RESIDENTIAL BUILDING
CODE, THE CALIFORNIA GREEN BUILDING STANDARDS CODE, THE
CALIFORNIA ELECTRICAL CODE, THE CALIFORNIA FIRE CODE, THE
CALIFORNIA PLUMBING CODE, AND THE CALIFORNIA MECHANICAL CODE,
MAKING CERTAIN AMENDMENTS BASED UPON LOCAL CONDITIONS, AND
AMENDING THE LYNWOOD MUNICIPAL CODE TO REFLECT SUCH CHANGES
THE CITY COUNCIL DOES ORDAIN AS FOLLOWS:
SECTION 1: Findings. The City Council finds as follows:
A. The City may adopt model codes by reference pursuant to Government Code §§
50022.2, et seq.;
B. Health and Safety Code § 17958 requires the City to adopt certain codes that are
set forth in Health and Safety Code § 17922 and published in the California Code
of Regulations;
.C. In accordance with Health and Safety Code § 17958.7, it is in the public interest
to adopt the most recent codes published by the California Building Standards
Commission;
D. Notice of public hearing to consider the adoption of the codes was published
pursuant to Government Code § 6066 and on January 27, 2017, a duly noticed
public hearing was held regarding the adoption of the Codes;
E. Pursuant to § 50022.6 of the Government Code, at least one copy of all codes
adopted by reference were filed with the City Clerk of the City and were available
for public inspection for at least fifteen (15) days preceding the date of the
hearing;
F. Pursuant to Government Code § 50022.9, the City Council intends to incorporate
by reference, with local amendments, the following 2016 codes in their entirety
as if set forth in full herein:
The California Building Code, California Residential Building ,Code, and
California Green Building Standards Code, 2016 Editions, as published in
Title 24, Parts 2, 2.5, 11 and 12 of the California Code of Regulations;
2. The California Electrical Code, 2016 Edition, as published in Title 24, Part 3 of
the California Code of Regulations;
3. The California Fire Code, 2016 Edition, as published in Title 24, Part 9 of the
California Code of Regulations;
4. The California Plumbing Code, 2016 Edition, as published in Title 24, Part 5
of the California Code of Regulations; and
5. The California Mechanical Code, 2016 Edition, as published in Title 24, Part 4
of the California Code of Regulations; and
6. The California Energy Code, 2016 Edition, as published in Title 24, Part 6 of
the California Code of Regulations.
SECTION 2: In accordance with Health and Safety Code § 17958.7, the City
Council finds that there are local climatic, geographic, and topographic conditions
justifying the various local amendments to the California Building Standards Code. The
City Council finds and determines that certain building, standards established by these
Codes are inadequate for use and enforcement in the City of Lynwood because of
unique geological conditions prevailing within the City. Such geological conditions affect
the potential consequences of soil strength loss due to known liquefaction zones within
the City and the nearby location of earthquake faults, resulting in the possibility of
tremendous loss of life and structures within the City unless appropriate building
standards are adopted. The lessons learned from previous earthquakes, such as the
Northridge and Whittier earthquakes, have been refined with studies and tests that have
continued since the last code adoption cycle. The results of these studies and tests
necessitate adoption of further amendments to the structural requirements of the
California Building Standards Code. The proposed structural amendments are detailed
in the sections of the Lynwood Municipal Code adopted by this ordinance which amend
the California Building Standards Code.
SECTION 3: Chapter 11 of the Lynwood Municipal Code ("LMC') is amended to
read as follows:
11-1 Building Code - Adopted by Reference; Where Filed
Chapters 1 through 35, and Appendix Chapters B, C, F, H, I, and J of California Code of
Regulations Title 24, Part 2 (the 2016 California Building Code) are adopted by
reference as the Building Code of the City of Lynwood.
In accordance with California Government Code Section 50022.6, one (1) copy of the
chapters and appendices must remain on file with the Building Official within the
Department of Planning and must be at all times maintained by the Building Official for
use and examination by the public.
PJ-
SECTION 4: Chapter 11 Building and Housing, Section 11-6 (Electrical Code)
and 11-6.1 (Electrical Code Adopted) of the Lynwood Municipal Code are hereby
amended to read as follows:
11-6 Electrical Code
11-6.1 Electrical Code Adopted:
Except as provided herein, the 2016 edition of the California Electrical Code, as
promulgated and published by the National Fire Protection Association, Inc., including
any California amendments and adopted annexes thereof, is hereby adopted by
reference as though fully set forth herein, and shall constitute and is hereby established
as "The Electrical Code of the City of Lynwood" ("electrical code" herein). A copy of the
2016 edition of the California Electrical Code has been deposited in the office of the City
Clerk and shall at all times be maintained by the City Clerk for use and examination by
the public.
SECTION 5: Chapter 11 Building and Housing, Section 11-9 (Plumbing Code)
and 11-9.1 (Plumbing Code Adopted) of the Lynwood Municipal Code are hereby
amended to read as follows:
11-9 Plumbing Code
11-9.1 Plumbing Code Adopted:
Except as provided herein, the 2016 edition of the California Plumbing Code, as
promulgated and published by the International Association of Plumbing and
Mechanical Officials, including any California amendments and adopted appendices
thereof, is hereby adopted - by reference as though fully set forth herein, and shall
constitute and is hereby established as "The Plumbing Code of the City of Lynwood"
("plumbing code" herein). A copy of the 2016 edition of the California Plumbing Code
has been deposited in the office of the City Clerk and shall at all times be maintained by
the City Clerk for use and examination by the public.
SECTION 6: Chapter 11 Building and Housing, Section 11-10 (Mechanical Code)
and 11-10.1 (Mechanical Code Adopted) of the Lynwood Municipal Code are hereby
amended to read as follows:
11-10 Mechanical Code
11-10.1 Mechanical Code Adopted:
Except as provided herein, the. 2016 edition of the California Mechanical Code, as
promulgated and published by the International Association of Plumbing and
Mechanical Officials, including any California amendments and adopted appendices
thereof, is hereby adopted by reference as though fully set forth herein, and shall
constitute and is hereby established as "The Mechanical Code of the City of Lynwood"
("mechanical code" herein). A copy of the 2016 edition of the California Mechanical
3
Code has been deposited in the office of the City 'Clerk and shall at all times be
maintained by the City Clerk for use and examination by the public.
SECTION 7: Chapter 11 Building and Housing, Section 11-18 (Appendix Chapter
Al of the California Building Conservation Code) and 11-18.1 (Appendix Chapter Al of
the California Building Conservation Code Adopted) of the Lynwood Municipal Code are
hereby amended to read as follows:
11-8 Appendix Chapter Al of the California Existing Building Code
11-18.1 Appendix Chapter Al of the California Existing Building Code Adopted:
Except as hereinafter provided, appendix chapter Al of the California Existing Building
Code, as contained in part 10 of title 24 of the California Code of Regulations is adopted
by reference and incorporated herein as though fully set forth and shall constitute
appendix chapter Al of the existing building code of the city. A copy of that California
Existing Building Code has been deposited in the office of the City Clerk and shall be, at
all times, maintained by the city clerk for use and examination by the public.
SECTION 8: Chapter 11 Building and Housing, Section 11-21 (Residential
Code), Section 11-21.1 (Residential Code Adopted) and Section 11-21.2 (Amendments
to the Residential Code) of the Lynwood Municipal Code are hereby amended to read
as follows:
11-21 Residential Code
11-21.1 Residential Code Adopted:
Except as provided herein, the 2016 edition of the California Residential Code, as
promulgated and published by the International Code Council, and including any
California amendments or adopted appendices, is hereby adopted by reference as
though fully set forth herein, and shall constitute and is hereby established as "The
Residential Code of the City of Lynwood" ("residential code" herein). A copy of the 2016
edition of the California Residential Code has been deposited in the office of the City
Clerk and shall at all times be maintained by the City Clerk for use and examination by
the public.
SECTION 9: Chapter 11 Building and Housing, Section 11-22 (Green Building
Standards Code) and 11-21.1 (Green Building Standards Code Adopted) of the
Lynwood Municipal Code are hereby amended to read as follows:
11-22 Green Building Standards Code
11-22.1 Green Building Standards Code Adopted:
Except as provided herein, the mandatory provisions of the 2016 edition of the
California Green Building Standards Code is hereby adopted by reference as though
fully set forth herein, and shall constitute and is hereby established as "The Green
Building Standards Code of the City of Lynwood" ("green code" herein). A copy of the
4
2016 edition of the California Green Building Standards Code has been deposited in the
office of the City Clerk and shall at all times be maintained by the City Clerk for use and
examination by the public.
SECTION 10: Environmental Assessment. The City Council determines that this
ordinance is exempt from review under the California Environmental Quality Act
(California Public Resources Code §§ 21000, et seq., "CEQA") and the regulations
promulgated thereunder (14 California Code of Regulations §§ 15000, et seq., the
"CEQA Guidelines") because it consists only of minor revisions and clarifications to an
existing code of construction -related regulations and specification of related procedures
and will not have the effect of deleting or substantially changing any regulatory
standards or findings required. Therefore, the adoption of this Ordinance does not have
the potential to cause significant effects on the environment and is exempt from further
review under CEQA Guidelines §15061(b)(3). In addition, this ordinance is an action
being taken for enhanced protection of the environment and is exempt from further
review under CEQA Guidelines § 15308.
SECTION 11: Construction. This Ordinance must be broadly construed in order
to achieve the purposes stated in this Ordinance. It is the City Council's intent that the
provisions of this Ordinance be interpreted or implemented by the City and others in a
manner that facilitates the purposes set forth in this Ordinance.
SECTION 12: Enforceability. Repeal of any provision of the Lynwood Municipal
Code does not affect any penalty, forfeiture, or liability incurred before, or preclude
prosecution and imposition of penalties for any violation occurring before this
Ordinance's effective date. Any such repealed part will remain in full force and effect for
sustaining action or prosecuting violations occurring before the effective date of this
Ordinance.
SECTION 13: Validity of Previous Code Sections. If this entire Ordinance or its
application is deemed invalid by a court of competent jurisdiction, any repeal or
amendment of the LMC or other city ordinance by this Ordinance will be rendered void
and cause such previous LMC provision or other the city ordinance to remain in full
force and effect for all purposes.
SECTION 14: Severability. If any part of this Ordinance or its application is
deemed invalid by a court of competent jurisdiction, the city council intends that such
invalidity will not affect the effectiveness of the remaining provisions or applications and,
to this end, the provisions of this Ordinance are severable.
SECTION 15: Publication. The City Clerk is directed to certify the passage and
adoption of this Ordinance; cause it to be entered into the City of Lynwood's book of
original ordinances; make a note of the passage and adoption in the records of this
meeting; and, within fifteen (15) days after the passage and adoption of this Ordinance,
cause it to be published or posted in accordance with California law..
5
SECTION 16: The City Clerk shall certify as to the adoption of this Ordinance
following the City Council's second reading and to cause it to be published as required
by law.
SECTION 17: Filing with Building Standards Commission. The City Clerk must
file a certified copy of this Ordinance with the California Building Standards
Commission.
First read at a regular meeting of the City Council held on the 24th day of January, 2017
and adopted and ordered published at a regular meeting of said Council on the 17th day
of February, 2017.
PASSED, APPROVED and ADOPTED this 7th day of February, 2017.
ATTEST:
Maria Quinonez, City Clerk
APPROVED AS TO FORM:
JAA UA
David A. Garcia, City Attorney
Maria T. Santillan-Bess, Mayor
APPROVED AS TO CONTENT:
RIEMANNIAN,
..-
STATE OF CALIFORNIA )
COUNTY OF LOS ANGELES )
I, the undersigned, City Clerk of the City of Lynwood, do hereby certify that the above
and foregoing Ordinance was duly adopted by the City Council of the City of Lynwood at
its regular meeting held on the 7th day of February, 2017.
AYES: COUNCIL MEMBERS ALATORRE, HERNANDEZ, MAYOR PRO TEM
SOLACHE, AND MAYOR SANTILLAN-BEAS
NOES: NONE
ABSENT: COUNCIL MEMBER CASTRO
ABSTAIN: NONE
f . X Z-17
Maria Quinonez, City Clerk
STATE OF CALIFORNIA )
COUNTY OF LOS ANGELES )
I, the undersigned, City Clerk of the City of Lynwood, and Clerk of the City Council of
said City, do hereby certify that the above and foregoing is a full, true and correct copy
of Ordinance No. 1691 in my office and that said Ordinance was adopted on the date
and by the vote therein stated. Dated this 7t" day of February, 2017.
DOWXN ,tW-Y ., I OFF& . M, F1111 -A4
Maria -Clerk
7
INTERNATIONAL
CODE COUNCIL®
2016 EDITION OF THE
LOS ANGELES REGION UNIFORM CODE PROGRAM
RE�f
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RECOMMENDED CODE AMENDMENTS TO THE
2016 EDITION OF THE CALIFORNIA BUILDING CODE,
CALIFORNIA RESIDENTIAL CODE, AND
CALIFORNIA GREEN BUILDING STANDARDS CODE
PREPARED BY:
ICC LOS ANGELES BASIN CHAPTER'S
GREEN AND SUSTAINABILITY COMMITTEE
STRUCTURAL COMMITTEE
Final Version: August 6, 2016
Updated Version: August 23, 2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
PREFACE
In 1957 our founding members established one of the earliest chapters of the International Conference of
Building Officials. Today the Chapter has grown to over eighty-nine Southern California jurisdictions, plus
consulting firms and other members of the construction industry. ICBO merged with two other building
official organizations to create the International Code Council. The Los Angeles Basin Chapter officially
became an ICC Chapter in December 2002.
The Los Angeles Basin Chapter has been very active throughout the years in leading an effort to create
uniformity of building codes and regulations in the greater Los Angeles region as well as addressing
policy issues of interest to building officials and the construction industry.
One such effort to promote uniformity of building regulations is through the Los Angeles Regional Uniform
Code Program ("LARUCP"). The LARUCP program began in July 1999 with the purpose of developing
uniform interpretations and handouts to serve as guidelines for building officials, contractors, engineers
and architects in the consistent application of the codes. The mission of the program was to minimize the
number of and to develop uniformity in local code amendments to the California codes for adoption by
jurisdictions in the greater Los Angeles region and beyond.
Leading the efforts to creating uniformity of building codes and regulations within the region are the
dedicated members of the Los Angeles County Building and Safety Division, City of Los Angeles
Department of Building and Safety, City of Long Beach Building and Safety Bureau, and other
jurisdictional members and partners in the greater Los Angeles region. Through the coordination of the
ICC Los Angeles Basin Chapter's Fire -Life Safety Committee, Structural Committee, Green and
Sustainability Committee, and Administration Committee, the following regulatory streamlining tasks to be
completed are:
1. Create uniformity of building standards code that can be adopted in most of the jurisdictions in the
greater Los Angeles region;
2. Reduce the total number of local technical amendments to the model code in the greater Los Angeles
region;
3. Receive support from many, if not all, of the 89 jurisdictions in the greater Los Angeles region;
4. Obtain active participation from a majority of the jurisdictions in the greater Los Angeles region in
formulating and implementing the program; and
5. With construction valuation of over $5 billion in the region, conservatively assuming that the program
produces a 1 % construction cost savings, achieve an estimated cost saving of $50 million per year in
the greater Los Angeles region.
DISCUSSION
Sections 13145.3, 17922, 17958 and 18941.5 of the California Health and Safety Code requires that the
latest California Building Standards Codes apply to local construction 180 days after they become
effective at the State level. The California Building Standards Commission has adopted the 2016 Edition
of the California Building Code, California Residential Code, and California Green Building Standards
Code. State Law requires that these Codes become effective at the local level on January 1, 2017.
Sections 17958.5 and 17958.7 of the California Health and Safety Code requires that local code
amendments to the California Building Standards Codes and other regulations, including but not limited
to, green building standards, be enacted only when an express finding is made that such modifications or
changes are reasonably necessary because of local climatic, geological, topographical or environmental
conditions.
2016 Edition of the California Building Code Page 2 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
The ICC Los Angeles Basin Chapter's Structural Committee and Green Building Standards Committee
are recommending that the 2016 Edition of the LARUCP Recommended Code Amendments contained in
this document, some of which continues amendments enacted during the previous code adoption cycle,
be considered for local code adoption for the following reasons:
To protect the community within the greater Los Angeles region from a vast array of fault systems
capable of producing major earthquakes and/or climate systems capable of producing major winds,
fire and rain related disaster.
2. To ensure and encourage energy efficiency and sustainable practices are incorporated into building
designs and constructions.
The 2016 Edition of the LARUCP Recommended Code Amendments have been widely circulated and
discussed over the past several months with various local jurisdictional members, SEAOSC Building
Code Committee, design professionals in the construction industry, and other interested groups or
individuals. The proposed code language along with the reasons and findings are detailed in this
document for each of the recommended code amendments to the 2016 Edition of the California Building
Standards Code.
STATEMENT ON USE OF DOCUMENT
The primary purpose of the ICC Los Angeles Basin Chapter's Committees is to serve and benefit its
members. To this end, the Committees provide a forum for the exchange, consideration, and discussion
of ideas and proposals that are relevant to the construction industry and the consensus of which forms
the basis for the proposed amendments contained in this document.
By making available the recommendations in this document, the Los Angeles Basin Chapter's
Committees do not insure any jurisdiction using the information it contains against any liability arising
from that use. The Committees disclaims liability for any injury to persons or to property, or other
damages of any nature whatsoever, whether special, indirect, consequential or compensatory, directly or
indirectly resulting from the publication, use of, or reliance on this document. The Committees makes no
guaranty or warranty as to the accuracy or completeness of any information provided herein. Any
jurisdiction using this document should rely on their own independent judgment and exercise reasonable
care in any given circumstances. Each jurisdiction adopting the proposed amendments contained in this
document should make an independent, substantiating .investigation of the validity of that information for
their particular use.
ACKNOWLEDGEMENT
The ICC Los Angeles Basin Chapter would like to express its gratitude and appreciation to all the
participating committee members and correspondents that spent countless hours over the past several
months assisting in the review, discussion, evaluation and drafting of the proposed recommended code
amendments to the 2016 Edition of the California Building Code, California Residential Code and
California Green Building Standards Code. Special thanks go out to the following individuals without
whose support and effort the recommendations presented herein would not be possible.
Aleia Long, County of Los Angeles Building and Safety Division
Armen Sarkisian, City of Los Angeles Building and Safety Department
Charles Russell, VCA Code Group
Clint Lee, County of Los Angeles Building and Safety Division
Colin Leung, City of Glendale Building and Safety Division
Eric Lim, County of Los Angeles Building and Safety Division
Gregory Bowser, City of Long Beach Building and Safety Bureau
2016 Edition of the California Building Code Page 3 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
James Gorbin, City of Torrance Building and Safety Division
James Lai, SEAOSC Seismology Committee
Jeff Li, County of Los Angeles Building and Safety Division
Jonathan Lam, County of Los Angeles Building and Safety Division
Joshua Hussey, County of Los Angeles Building and Safety Division
Kentaro Nishimura, County of Los Angeles Building and Safety Division
Kristin Norman, County of Los Angeles Building and Safety Division
Mehrasa Khanpour, City of Santa Monica Building and Safety Division
Miroslav Lhotsky, City of Glendale Building and Safety Division
Osama Younan, City of Los Angeles Building and Safety Department
Philip Yin, City of Long Beach Building and Safety Bureau
Razmig Shamim, County of Los Angeles Building and Safety Division
Sarkis Hairapetian, City of Glendale Building and Safety Division
Sarkis Nazerian, City of Pasadena Building and Safety
Shahen Akelyan, City of Los Angeles Building and Safety Department
Tom Van Dorpe, SEAOSC Light -Frame Systems Committee
Truong Huynh, City of Long Beach Building and Safety Bureau
Victor Cuevas, City of Los Angeles Building and Safety Department
UPDATED VERSION
Whenever there is an updated version to this document, a symbol in the margins indicate where changes
have been made.
IThis symbol indicates that a change has been made.
2016 Edition of the California Building Code Page 4 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
EXPRESS TERM LANGUAGE
LOCAL GOVERNMENT AMENDMENTS UNDER THE BUILDING STANDARDS LAW:
Pursuant to Sections 17958.5 and 17958.7 of the California Health and Safety Code, the Building
Standards Law takes a straightforward approach to amendments by local governments. Local code
amendments are permitted under the following conditions:
• The governing body of the local government must make express findings that amendments to the
building standard contained in California Codes of Regulation Title 24 are necessary because of local
climatic, geological, topographical or environmental conditions.
• The local government amendments must provide a more restrictive building standard than that
contained in California Codes of Regulation Title 24
• The amendments are not effective until copies of both the express findings and the amendments, with
the amendments expressly marked and identified as to the applicable findings, have been filed with
the California Building Standards Commission.
LEGEND FOR PROPOSING AMENDMENTS TO PROPOSED BUILDING STANDARDS:
1. Existing California amendments or code language being modified: All such language shown in italics,
modified language is underlined or shown in strikeout.
2. Model code language with new California amendments: Model code language shown in Arial 10
fonts; California amendments to the model code texts shown underlined and in italics.
3. Proposed amended or adopted text: All language shown in underline.
4. Repealed text: All language shown in s+�„ e- it.
2016 Edition of the California Building Code Page 5 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
TABLE OF CONTENT
8
TITLE/DESCRIPTION
PAGE
Preface
2
Discussion
2
Statement on Use of Document
3
Acknowledgement
3
Express Term Language
5
Table of Content
6
PART
8
Summary of Recommended LARUCP Amendments to the 2016 CBC
9
2016 LARUCP 15-01 Amend CBC Section 1507.3.1 Deck Requirements
10
2016 LARUCP 16-01 Add CBC Section 1613.5.2 Structural Separation
11
2016 LARUCP 16-02 Add CBC Section 1613.5.3 Values for Vertical Combinations
12
2016 LARUCP 16-03 Add CBC Section 1613.5.4 Wood Diaphragms
13
2016 LARUCP 16-04 Add CBC Section 16.13.5.5 Maximum SDS Value in Determination of CS
14
and E„
2016 LARUCP 16-05 Add CBC Section 1613.7 Seismic Design Provisions for Hillside Buildings
15
2016 LARUCP 16-06 Add CBC Section 1613.8 Suspended Ceilings
22
2016 LARUCP 17-01 Amend CBC Section 1704.6 Structural Observations
24
2016 LARUCP 17-02 Amend CBC Section 1704.6.1 Structural Observations for Seismic
26
Resistance
2016 LARUCP 17-03 Amend CBC Section 1705.3 Special Inspections for Concrete
27
Construction
2016 LARUCP 17-04 Amend CBC Section 1705.12 Special Inspections for Seismic Resistance
28
2016 LARUCP 18-01 Amend CBC Section 1807.1.4 Permanent Wood Foundation Systems
30
2016 LARUCP 18-02 Amend CBC Section 1807.1.6 Prescriptive Design of Concrete and
31
Masonry Foundation Walls
2016 LARUCP 18-03 Amend CBC Section 1809.3 Stepped Footings
32
2016 LARUCP 18-04 Amend CBC Section 1809.7 and Table 1809.7 Prescriptive Footings for
33
Light Frame Construction
2016 LARUCP 18-05 Amend CBC Section 1809.12 Timber Footings
34
2016 LARUCP 18-06 Amend CBC Section 1810.3.2.4 Timber
35
2016 LARUCP 19-01 Amend CBC Section 1905.1.7 Minimum Reinforcement
36
2016 LARUCP 19-02 Amend CBC Section 1905.1 and Add Sections 1905.1.9 thru 19.05.1.11
38
Reinforcement
2016 LARUCP 23-01 Amend CBC Section 2304.10.1 Fastener Requirements
40
2016 LARUCP 23-02 Amend CBC Section 2304.12.5 Wood Retaining Walls
41
2016 LARUCP 23-03 Amend CBC Section 2305.4 Quality of Nails
42
2016 LARUCP 23-04 Add CBC Section 2305.5 Hold -Down Connectors
43
2016 LARUCP 23-05 Amend CBC Section 2306.2 Wood -Frame Diaphragms
44
2016 LARUCP 23-06 Amend CBC Section 2306.3 Wood -Frame Shear Walls
46
2016 LARUCP 23-07 Add CBC Section 2307.2 Wood -Frame Shear Walls
48
2016 LARUCP 23-08 Amend CBC Table 2308.6.1 Wall Bracing Requirements
49
2016 LARUCP 23-09 Amend CBC Section 2308.6.5.1 Alternative Bracing
51
2016 LARUCP 23-10 Amend CBC Section 2308.6.8.1 Foundation Requirements
54
2016 LARUCP 23-11 Amend CBC Section 2308.6.9 Attachment of Sheathing
56
PART II
57
Summary of Recommended LARUCP Amendments to the 2016 CRC
58
2016 LARUCP R3-01 Amend CRC Section R301.1.3.2 Woodframe Structures
60
2016 LARUCP R3-02 Amend CRC Section R301.1.4 Slopes Steeper Than 33%
61
2016 LARUCP R3-03 Amend CRC Section R301.2.2.2.5 Building Irregularities
62
2016 Edition of the California Building Code Page 6 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
TITLE/DESCRIPTION
PAGE
2016 LARUCP R3-04 Add CRC Section R301.2.2.3.8 Anchorage of M.E.P. Components and
64
Equipment
98
2016 LARUCP R4-01 Amend CRC Section R401.1 Foundation Application
65
2016 LARUCP R4-02 Amend CRC Sections R403.1.2, R403.1.3.6, R403.1.5 General Footings
67
2016 LARUCP R4-03 Amend CRC Section R404.2 Wood Foundation Walls
69
2016 LARUCP R5-01 Amend CRC Section R501.1 Application
70
2016 LARUCP R5-02 Amend CRC Section R503.2.4 Openings In Horizontal Diaphragms
71
2016 LARUCP R6-01 Amend CRC Table R602.3(1) Fastener Schedule
73
2016 LARUCP R6-02 Amend CRC Table R602.3(2) Alternate Attachment
75
2016 LARUCP R6-03 Amend CRC Table R602.10.3(3) Bracing Requirement
76
2016 LARUCP R6-04 Amend CRC Table R602.10.4 Intermittent Bracing Method
79
2016 LARUCP R6-05 Amend CRC Figure R602.10.6.1 Alternate Braced Wall Panel
81
2016 LARUCP R6-06 Amend CRC Figure R602.10.6.2 Portal Frame
84
2016 LARUCP R6-07 Amend CRC Table R602.10.5 Braced Wall Panels
86
2016 LARUCP R6-08 Amend CRC Section R602.10.2.3 Minimum Number of Braced Wall
88
Panels
2016 LARUCP R6-09 Amend CRC Figure R602.10.6.4 Method CS -PF
89
2016 LARUCP R6-10 Amend CRC Section R606.4.4 Parapet Walls
91
2016 LARUCP R6-11 Amend CRC Section R606.12.2.2.3 Reinforcement Requirements for
92
Masonry Elements
2016 LARUCP R6-12 Amend CRC Section R602.3.2 Single Top Plate
93
2016 LARUCP R8-01 Add CRC Section R803.2.4 Openings in Horizontal Diaphragms
94
2016 LARUCP R10-01 Amend CRC Section R1001.3.1 Vertical Reinforcing
95
PART III
96
Summary of Recommended LARUCP Amendments to the 2016 CALGreen
97
2016 LARUCP G1-16 Add CALGreen Section 101.12 Fee for Mandatory Measures
98
2016 LARUCP G2-16 Add CALGreen Section 101.12.1 Fee for TIER Measures
99
2016 LARUCP G3-16 Amend CALGreen Section 202 Sustainability Definition
100
2016 LARUCP G4-16 Amend CALGreen Section 301.1 Scope
101
2016 LARUCP G5-16 Amend CALGreen Section 301. 1.1 Additions & Alteration
102
2016 LARUCP G6-16 Amend CALGreen Section 5.408.3 Excavated Soil and Land Clearing
104
Debris
112
PART IV
105
Summary of Recommended LARUCP Amendments to the 2016 CALGreen
106
2016 LARUCP GA1-16 Amend CALGreen Section A4.105.2 Reuse of Materials
107
2016 LARUCP GA2-16 Amend CALGreen Section A4106.5 Cool Roof for Reduction of Heat
108
Island Effect
2016 LARUCP GA3-16 Amend CALGreen Section A4.303.4 Nonwater Supplied Urinals and
110
Waterless Toilets
2016 LARUCP GA4-16 Amend CALGreen Section A4.404.3 Building Systems
111
2016 LARUCP GA5-16 Amend CALGreen Section A4.405.1 Prefinished Building Materials
112
2016 LARUCP GA6-16 Amend CALGreen Section A4.405.4 Use of Building Materials From
113
Rapidly Renewable Sources
2016 LARUCP GA7-16 Amend CALGreen Section A4.407.1 Drainage Around Foundation
114
2016 LARUCP GA8-16 Amend CALGreen Section A5.106.4.1 Short Term Bicycle Parking
115
2016 LARUCP GA9-16 Amend CALGreen Section A5.106.4.3 Changing Rooms
116
2016 LARUCP GA10-16 Amend CALGreen Section A5.106.6.1 Reducing Parking Capacity
117
2016 LARUCP GA11-16 Amend CALGreen Section A5.406.1 Choice of Materials
118
2016 Edition of the California Building Code Page 7 of 118
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
PART I
LARUCP RECOMMENDED CODE AMENDMENTS TO THE
2016 EDITION OF THE CALIFORNIA BUILDING CODE
2016 Edition of the California Building Code Page 8 of 118
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SUMMARY OF RECOMMENDED LARUCP AMENDMENTS TO THE 2016 CBC
(N) 2016
LARUCP
NO.
(E) 2013
LARUCP
NO.
TITLE/DESCRIPTION
STATUS
15-01
15-01
Amend CBC Section 1507.3.1 Deck Requirements
R
16-01
16-01
Add CBC Section 1613.5.2 Structural Separation
M
16-02
16-02
Add CBC Section 1613.5.3 Values for Vertical Combinations
M
16-03
16-03
Add CBC Section 1613.5.4 Wood Diaphragms
M
16-04
Add CBC Section 1613.5.5 Maximum SDS Value in Determination of
CS and E„
N
16-05
16-04
Add CBC Section 1613.7 Seismic Design Provisions for Hillside
Buildings
R
16-06
16-05
Add CBC Section 1613.8 Suspended Ceilings
M
17-01
17-01
Amend CBC Section 1704.6 Structural Observations
M
17-02
17-02
Amend CBC Section 1704.6.1 Structural Observations Seismic
Resistance
M
17-03
17-03
Amend CBC Section 1705.3 Special Inspections for Concrete
Construction
R
17-94
AmeRd GBG Table 1795.3 SpeGial InspeGtiOR fOF GORG
Genstrustfen
D
17-04
17-05
Amend CBC Section 1705.12 Special Inspections for Seismic
Resistance
M
4-96
D
18-01
18-01
Amend CBC Section 1807.1.4 Permanent Wood Foundation System
M
18-02
18-02
Amend CBC Section 1807.1.6 Prescriptive Design of Concrete and
Masonry Foundation Walls
R
18-03
18-03
1 Amend CBC Section 1809.3 Stepped Footings
M
18-04
18-04
Amend CBC Section 1809.7 and Table 1809.7 Prescriptive Footings
for Light Frame Construction
R
18-05
18-05
Amend CBC Section 1809.12 Timber Footings
M
18-06
18-06
Amend CBC Section 1810.3.2.4 Timber
M
49-01
Almpnd CRrcpnt I POE 1 2 Wig" Pop
D
19-01
19-02
Amend CBC Section 1905.1.7 Minimum Reinforcement
M
19-02
19-03
Amend CBC Section 1905.1 and Add Sections 1905.1.9 thru
19.05.1.11 Reinforcement
M
23-01
23-01
Amend CBC Section 2304.10.1 Fastener Requirement
M
23-02
23-02 1
Amend CBC Section 2304.12.5 Wood Retaining Walls
M
23-03
23-03
Add CBC Section 2305.4 Quality of Nails
R
23-04
23-04
Add CBC Section 2305.5 Hold-down Connectors
R
23-05
23-05
Amend CBC Section 2306.2 Wood -Frame Diaphragms
M
23-06
23-06
Amend CBC Section 2306.3 Wood -Frame Shear Walls
M
23-07
23-06
Add CBC Section 2307.2 Wood -Frame Shear Walls
M
23-08
23-09 1
Amend CBC Table 2308.6.1 Wall Bracing Requirements
M
23-09
23-08
Amend CBC Sections 2308.6.5, Figure 2308.6.5.1 and Figure
2308.6.5.2 Alternative Bracing
M
23-10
23-07
Amend CBC Section 2308.6.8.1 Foundation Requirements
M
23-11
23-10
Amend CBC Section 2308.6.9 Attachment of Sheathing
M
FOOTNOTE:
1. R = Retain and update existing amendment, M = Modify existing amendment, D = Delete existing 2013 LARUCP amendment,
N = New amendment proposed.
2016 Edition of the California Building Code Page 9 of 118
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 15-01. Section 1507.3.1 of the 2016 Edition of the California Building Code is amended to
read as follows:
1507.3.1 Deck requirements. Concrete and clay the shall be installed only over solid sheathing OF
spaced structural sheathing boards.
RATIONALE:
Section 1507.3.1 is amended to require concrete and clay tiles to be installed only over solid structural
sheathing boards. The change is necessary because there were numerous observations of tile roofs
pulling away from wood framed buildings following the 1994 Northridge Earthquake. The SEAOSC/LA
City Post Northridge Earthquake committee findings indicated significant problems with the roofs was due
to inadequate design and/or construction. Therefore, the amendment is needed to minimize such
occurrences in the event of future significant earthquakes.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the 1994 Northridge Earthquake, the 1987 Whittier
Narrows Earthquake, the 1971 San Fernando Earthquake and the 1933 Long Beach Earthquake. This
amendment will reduce the failure of concrete and clay tile roofs during a significant earthquake and is in
accordance with the scope and objectives of the California Building Code.
2016 Edition of the California Building Code Page 10 of 118
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2016 LARUCP 16-01. Section 1613.5.2 is added to Chapter 16 of the 2016 Edition of the California
Building Code to read as follows:
1613.6.2 Structural Separation. Modify ASCE 7 Section 12.12.3 Equation 12.12-1 as follows:
SM = Cax (12.12-1)
e
RATIONALE:
The inclusion of the importance factor in this equation has the unintended consequence of reducing the
minimum seismic separation distance for important facilities such as hospitals, schools, police and fire
stations from adjoining structures. The proposal to omit the importance factor from Equation 12.12-1 will
ensure that a safe seismic separation distance is provided. This proposed amendment is a continuation of
an amendment adopted during previous code adoption cycles.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the 1994 Northridge Earthquake, the 1987 Whittier
Narrows Earthquake, the 1971 San Fernando Earthquake and the 1933 Long Beach Earthquake. The
proposed modification to omit the importance factor in the equation ensures that a safe seismic
separation distance is maintained for important facilities from adjoining structures and therefore need to
be incorporated into the code to assure that new buildings and structures and additions or alterations to
existing buildings or structures are designed and constructed in accordance with the scope and objectives
of the California Building Code.
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2016 LARUCP 16-02. Section 1613.5.3 is added to Chapter 16 of the 2016 Edition of the California
Building Code to read as follows:
1613.5.3 Values for Vertical Combinations. Modify ASCE 7 Section 12.2.3.1 Exception 3 as follows:
3. Detached one- and two-family dwellings up to two stories in height of light frame construction.
RATIONALE:
Observed damages to one and two family dwellings of light frame construction after the Northridge
Earthquake may have been partially attributed to vertical irregularities common to this type of occupancy
and construction. In an effort to improve quality of construction and incorporate lesson learned from
studies after the Northridge Earthquake, the proposed modification to ASCE 7-10 Section 12.2.3.1
Exception 3 by limiting the number of stories and height of the structure to two stories will significantly
minimize the impact of vertical irregularities and concentration of inelastic behavior from mixed structural
systems. This proposed amendment is a continuation of an amendment adopted during previous code
adoption cycles.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the 1994 Northridge Earthquake. The proposed
modification to limit mixed structural system to two stories is intended to improve quality of construction by
reducing potential damages that may result from vertical irregularities of the structural system in buildings
subject to high seismic load and therefore need to be incorporated into the code to assure that new
buildings and structures and additions or alterations to existing buildings or structures are designed and
constructed in accordance with the scope and objectives of the California Building Code.
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2016 LARUCP 16-03. Section 1613.5.4 is added to Chapter 16 of the 2016 Edition of the California
Building Code to read as follows:
1613.5.4 Wood Diaphraqms. ModifV ASCE 7 Section 12.11.2.2.3 as follows:
12.11.2.2.3 Wood Diaphragms. In wood diaphragms, the continuous ties shall be in addition to the
diaphragm sheathing. Anchorage shall not be accomplished by use of toe nails or nails subject to
withdrawal nor shall wood ledgers or framing be used in cross -grain bending or cross -grain tension.
The diaphragm sheathing shall not be considered effective as providing ties or struts required by this
section.
For structures assigned to Seismic Design Category D, E or F, wood diaphragms supporting
concrete or masonry walls shall comply with the following:
1. The spacing of continuous ties shall not exceed 40 feet. Added chords of diaphragms may be
used to form subdiaphragms to transmit the anchorage forces to the main continuous crossties.
2. The maximum diaphragm shear used to determine the depth of the subdiaphragm shall not
exceed 75% of the maximum diaphragm shear.
RATIONALE:
A joint Structural Engineers Association of Southern California (SEAOSC), Los Angeles County and Los
Angeles City Task Force investigated the performance of concrete and masonry construction with flexible
wood diaphragm failures after the Northridge earthquake. It was concluded at that time that continuous
ties are needed at specified spacing to control cross grain tension in the interior of the diaphragm.
Additionally, there was a need to limit subdiaphragm allowable shear loads to control combined
orthogonal stresses within the diaphragm. Recognizing the importance and need to continue the
recommendation made by the task force while taking into consideration the improve performances and
standards for diaphragm construction today, this proposal increases the continuous tie spacing limit to 40
ft in lieu of 25 ft and to use 75% of the allowable code diaphragm shear to determine the depth of the sub -
diaphragm in lieu of the 300 plf and is deemed appropriate and acceptable. Due to the frequency of this
type of failure during the past significant earthquakes, various jurisdictions within the Los Angeles region
have taken this additional step to prevent roof or floor diaphragms from pulling away from concrete or
masonry walls. This proposed amendment is a continuation of an amendment adopted during previous
code adoption cycles.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the 1994 Northridge Earthquake. The proposed
modification to require special anchorage of the diaphragm to the wall and limit the allowable shear will
address special needs for concrete and masonry construction with flexible wood diaphragm and therefore
need to be incorporated into the code to assure that new buildings and structures and additions or
alterations to existing buildings or structures are designed and constructed in accordance with the scope
and objectives of the California Building Code.
2016 Edition of the California Building Code Page 13 of 118
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2016 LARUCP 16-04. Section 1613.5.5 is added to Chapter 16 of the 2016 Edition of the California
Building Code to read as follows:
1613.5.5 Maximum Sos Value in Determination of C, and E,,. Modify ASCE 7 Section 12.8.1.3 as
follows:
12.8.1.3 Maximum C Value in Determination of G.. Far regular Stru uotu lre6 five stories or less above
the base, , Gs Oell1ana �J fed in Seetien 11.2 d with eried j—T, of nV.lelj��rg n,itted to he
�J1 T01T- lG
evaluated using the larger of either C equal t 1.5 or p en99 t of the value o
uf C rrmined peF
S, os deter
Conti on 11 A 1 er 11 4.7.
12.8.1.3 Maximum Sos Value in Determination of CS and E,,. The value of C. and E„ are permitted
to be calculated using a value of S equal to 1.0 but not less than 70% of SDs as defined in Section
11.4.4, provided that all of the following criteria are met:
1. The structure does not have irregularities, as defined in Section 12.3.2:
2. The structure does not exceed five stories above the lower of the base or grade plane as
defined in Section 11.2, and, where present, each mezzanine level shall be considered a
story for the purpose of this limit;
3. The structure has a fundamental period, T, that does not exceed 0.5 seconds, as determined
using Section 12.8.2:
4. The structure meets the requirements necessary for the redundancy factor, p, to be permitted
to be taken as 1.0, in accordance with Section 12.3.4.2;
5. The site soil properties are not classified as Site Classes E or F. as defined in Section 11.4.2:
and
6. The structure is classified as Risk Category I or II, as defined in Section 1.5.1.
RATIONALE:
Amendment in the California Building Code is made to be consistent with ASCE 7-16, and is further
amended herein to be consistent with ASCE 7-16 Supplement1. The modification is necessary to avoid
misinterpretation on the intent of the five story limit for which the SDS cap is applicable where there is
flexible structure above a rigid podium base. The addition of "grade plane" clarifies the intent that the
base is measured from the lowest structure in those instances where there is a vertical combination of
two systems. Many of such combinations of systems will not satisfy exclusion 1, in which the structure
must meet the definition of "regular" based on ASCE 7 Section 12.3.2. This modification provides safe
design requirements in the selection of building period to calculate seismic base shear in building design
accounting for dynamic story mass distribution throughout the inelastic range of ground motion. This
amendment does not prevent designing of five levels of light frame wood construction on top of a
concrete podium by using the calculated SDS without the 70% cap.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings constructed over and near a vast array of fault systems capable of producing major
earthquakes, including but not limited to the 1994 Northridge Earthquake. Currently mezzanines do not
have to be considered as a floor level for Heights and Areas limits of Chapter 5 of the IBC. When applying
the story height allowing SDS to be equal to 1.0, but not less than 70% of calculated SDS, the five story
height limitation needs to consider mezzanines as individual floor levels due to added mass, overturning
forces and variation in shear wall stiffness at the mezzanine floor levels, and therefore needs to be
incorporated into the code to assure that new buildings and additions to existing buildings are designed
and constructed in accordance with the scope and objectives of the California Building Code.
2016 Edition of the California Building Code Page 14 of 118
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 16-05. Section 1613.7 is added to Chapter 16 of the 2016 Edition of the California
Building Code to read as follows:
1613.7 Seismic Design Provisions for Hillside Buildings.
1613.7.1 Purpose. The purpose of this section is to establish minimum regulations for the design and
construction of new buildings and additions to existing buildings when constructing such buildings on
or into slopes steeper than one unit vertical in three units horizontal (33.3°/x). These regulations
establish minimum standards for seismic force resistance to reduce the risk of iniury or loss of life in
the event of earthquakes.
1613.7.2 Scope. The provisions of this section shall apply to the design of the lateral -force -resisting
system for hillside buildings at and below the base level diaphragm. The design of the lateral -force -
resisting system above the base level diaphragm shall be in accordance with the provisions for
seismic and wind design as required elsewhere in this division.
Exception: Non -habitable accessory buildings and decks not supporting or supported from the
main building are exempt from these regulations.
1613.7.3 Definitions. For the purposes of this section certain terms are defined as follows:
BASE LEVEL DIAPHRAGM is the floor at, or closest to, the top of the highest level of the
foundation.
DIAPHRAGM ANCHORS are assemblies that connect a diaphragm to the adjacent foundation at
the uphill diaphragm edge.
DOWNHILL DIRECTION is the descending direction of the slope approximately perpendicular to
the slope contours.
FOUNDATION is concrete or masonry which supports a building, including footings, stem walls,
retaining walls, and grade beams.
FOUNDATION EXTENDING IN THE DOWNHILL DIRECTION is a foundation running downhill
and approximately perpendicular to the uphill foundation.
HILLSIDE BUILDING is any building or portion thereof constructed on or into a slope steeper than
one unit vertical in three units horizontal (33.3%). If only a portion of the building is supported on
or into the slope, these regulations apply to the entire building.
PRIMARY ANCHORS are diaphragm anchors designed for and providing a direct connection as
described in Sections 1613.7.5 and 1613.7.7.3 between the diaphragm and the uphill foundation.
SECONDARY ANCHORS are diaphragm anchors designed for and providing a redundant
diaphragm to foundation connection, as described in Sections 1613.7.6 and 1613.7.7.4.
UPHILL DIAPHRAGM EDGE is the edge of the diaphragm adjacent and closest to the highest
ground level at the perimeter of the diaphragm.
UPHILL FOUNDATION is the foundation parallel and closest to the uphill diaphragm edge.
1613.7.4 Analysis and Desiqn.
1613.7.4.1 General. Every hillside buildinq within the scope of this section shall be analyzed,
designed, and constructed in accordance with the provisions of this division. When the code -
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prescribed wind design produces greater effects, the wind design shall govern, but detailing
requirements and limitations prescribed in this and referenced sections shall be followed.
1613.7.4.2 Base Level Diaphragm -Downhill Direction. The following provisions shall apply to
the seismic analysis and design of the connections for the base level diaphragm in the downhill
direction.
1613.7.4.2.1 Base for Lateral Force Design Defined. For seismic forces acting in the
downhill direction, the base of the building shall be the floor at or closest to the top of the
highest level of the foundation.
1613.7.4.2.2 Base Shear. In developing the base shear for seismic design, the response
modification coefficient (R) shall not exceed 5 for bearing wall and building frame systems.
The total base shear shall include the forces tributary to the base level diaphragm including
forces from the base level diaphragm.
1613.7.5 Base Shear Resistance -Primary Anchors.
1613.7.5.1 General. The base shear in the downhill direction shall be resisted through primary
anchors from diaphragm struts provided in the base level diaphragm to the foundation.
1613.7.5.2 Location of Primary Anchors. A primary anchor and diaphragm strut shall be
provided in line with each foundation extending in the downhill direction. Primary anchors and
diaphragm struts shall also be provided where interior vertical lateral -force -resisting elements
occur above and in contact with the base level diaphragm. The spacing of primary anchors and
diaphragm struts or collectors shall in no case exceed 30 feet (9144 mm).
1613.7.5.3 Design of Primary Anchors and Diaphragm Struts. Primary anchors and
diaphragm struts shall be designed in accordance with the requirements of Section 1613.7.8.
1613.7.5.4 Limitations. The following lateral -force -resisting elements shall not be designed to
resist seismic forces below the base level diaphragm in the downhill direction:
1. Wood structural panel wall sheathing,
2. Cement plaster and lath,
3. Gypsum wallboard, and
4. Tension only braced frames.
Braced frames designed in accordance with the requirements of Section 2205.2.1.2 may be
used to transfer forces from the primary anchors and diaphragm struts to the foundation
provided lateral forces do not induce flexural stresses in any member of the frame or in the
diaphragm struts. Deflections of frames shall account for the variation in slope of diagonal
members when the frame is not rectangular.
1613.7.6 Base Shear Resistance -Secondary Anchors.
1613.7.6.1 General. In addition to the primary anchors required by Section 1613.7.5, the base
shear in the downhill direction shall be resisted through secondary anchors in the uphill
foundation connected to diaphragm struts in the base level diaphragm.
Exception: Secondary anchors are not required where foundations extending in the downhill
direction spaced at not more than 30 feet (9144 mm) on center extend up to and are directly
connected to the base level diaphragm for at least 70% of the diaphragm depth.
1613.7.6.2 Secondary Anchor Capacity and Spacing. Secondary anchors at the base level
diaphragm shall be designed for a minimum force equal to the base shear, including forces
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tributary to the base level diaphragm, but not less than 600 pounds per lineal foot (8.76 kN/m)
based on Allowable Stress Design (ASD) levels. The secondary anchors shall be uniformly
distributed along the uphill diaphragm edge and shall be spaced a maximum of 4 feet (1219 mm)
on center.
1613.7.6.3 Design. Secondary anchors and diaphragm struts shall be designed in accordance
with Section 1613.7.8.
1613.7.7 Diaphragms Below the Base Level -Downhill Direction. The following provisions shall
apply to the lateral analysis and design of the connections for all diaphragms below the base level
diaphragm in the downhill direction.
1613.7.7.1Diaphragm Defined. Every floor level below the base level diaphragm shall be
designed as a diaphragm.
1613.7.7.2 Design Force. Each diaphragm below the base level diaphragm shall be designed for
all tributary loads at that level using a minimum seismic force factor not less than the base shear
coefficient.
1613.7.7.3 Design Force Resistance -Primary Anchors. The design force described in Section
1613.7.7.2 shall be resisted through primary anchors from diaphragm struts provided in each
diaphragm to the foundation. Primary anchors shall be provided and designed in accordance with
the requirements and limitations of Section 1613.7.5.
1613.7.7.4 Design Force Resistance -Secondary Anchors.
1613.7.7.4.1 General. In addition to the primary anchors required in Section 1613.7.7.3, the
design force in the downhill direction shall be resisted through secondary anchors in the uphill
foundation connected to diaphragm struts in each diaphragm below the base level.
Exception: Secondary anchors are not required where foundations extending in the
downhill direction, spaced at not more than 30 feet (9144 mm) on center, extend up to
and are directly connected to each diaphragm below the base level for at least 70% of
the diaphragm depth.
1613.7.7.4.2 Secondary Anchor Capacity. Secondary anchors at each diaphragm below
the base level diaphragm shall be designed for a minimum force equal to the design force but
not less than 300 pounds per lineal foot (4.38 kN/m) based on Allowable Stress Design
(ASD) levels. The secondary anchors shall be uniformly distributed along the uphill
diaphragm edge and shall be spaced a maximum of 4 feet (1219 mm) on center.
1613.7.7.4.3 Design. Secondary anchors and diaphragm struts shall be designed in
accordance with Section 1613.7.8.
1613.7.8 Primary and Secondary Anchorage and Diaphragm Strut Design. Primary and
secondary anchors and diaphragm struts shall be designed in accordance with the following
provisions:
1. Fasteners. All bolted fasteners used to develop connections to wood members shall be
provided with square plate washers at all bolt heads and nuts. Washers shall be minimum
0.229 inch by 3 inches by 3 inches (5.82 mm by 76 mm by 76 mm) in size. Nuts shall be
tightened to finger tight plus one half (1/2) wrench turn prior to covering the framing.
2. Fastening. The diaphragm to foundation anchorage shall not be accomplished by the use of
toenailing, nails subject to withdrawal, or wood in cross -grain bending or cross -grain tension.
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3. Size of Wood Members. Wood diaphragm struts collectors, and other wood members
connected to primary anchors shall not be less than 3 inch (76 mm) nominal width. The
effects of eccentricity on wood members shall be evaluated as required per Item 9.
4. Design. Primary and secondary anchorage, including diaphragm struts, splices, and
collectors shall be designed for 125% of the tributary force.
5. Allowable Stress Increase. The one-third allowable stress increase permitted under Section
1605.3.2 shall not be taken when the working (allowable) stress design method is used.
6. Steel Element of Structural Wall Anchorage System. The strength design forces for steel
wit
elements of the structural wall anchorage system, h the exception of anchor bolts and
reinforcing steel, shall be increased by 1.4 times the forces otherwise required.
7. Primary Anchors. The load path for primary anchors and diaphragm struts shall be fully
developed into the diaphragm and into the foundation. The foundation must be shown to be
adequate to resist the concentrated loads from the primary anchors.
8. Secondary Anchors. The load path for secondary anchors and diaphragm struts shall be fully
developed in the diaphragm but need not be developed beyond the connection to the
foundation.
9. Symmetry. All lateral force foundation anchorage and diaphragm strut connections shall be
symmetrical. Eccentric connections may be permitted when demonstrated by calculation or
tests that all components of force have been provided for in the structural analysis or tests.
10. Wood Ledgers. Wood ledgers shall not be used to resist cross -grain bending or cross -grain
tension.
1613.7.9 Lateral -Force -Resisting Elements Normal to the Downhill Direction.
1613.7.9.1 General. In the direction normal to the downhill direction, lateral-force-resistin
elements shall be designed in accordance with the requirements of this section.
1613.7.9.2 Base Shear. In developing the base shear for seismic design, the response
modification coefficient (R) shall not exceed 5 for bearing wall and building frame systems.
1613.7.9.3 Vertical Distribution of Seismic Forces. For seismic forces actinq normal to the
downhill direction the distribution of seismic forces over the height of the building using Section
12.8.3 of ASCE 7 shall be determined using the height measured from the top of the lowest level
of the building foundation.
1613.7.9.4 Drift Limitations. The story drift below the base level diaphragm shall not exceed
0.007 times the story height at strength design force level. The total drift from the base level
diaphragm to the top of the foundation shall not exceed 3/4 inch (19 mm). Where the story height
or the height from the base level diaphragm to the top of the foundation varies because of a
stepped footing or story offset, the height shall be measured from the average height of the top of
the foundation. The story drift shall not be reduced by the effect of horizontal diaphragm stiffness.
1613.7.9.5 Distribution of Lateral Forces.
1613.7.9.5.1 General. The design lateral force shall be distributed to lateral -force -resisting
elements of varying heights in accordance with the stiffness of each individual element.
1613.7.9.5.2 Wood Structural Panel Sheathed Walls. The stiffness of a stepped wood
structural panel shear wall may be determined bV dividing the wall into adjacent rectangular
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elements, subject to the same top of wall deflection. Deflections of shear walls may be
estimated by AWC SDPWS Section 4.3.2. Sheathing and fastening requirements for the
stiffest section shall be used for the entire wall. Each section of wall shall be anchored for
shear and uplift at each step. The minimum horizontal length of a step shall be 8 feet (2438
mm) and the maximum vertical height of a step shall be 2 feet 8 inches (813 mm).
1613.7.9.5.3 Reinforced Concrete or Masonry Shear Walls. Reinforced concrete or
masonry shear walls shall have forces distributed in proportion to the rigidity of each section
of the wall.
1613.7.9.6 Limitations. The following lateral force -resisting -elements shall not be designed to
resist lateral forces below the base level diaphragm in the direction normal to the downhill
direction:
1. Cement plaster and lath,
2. Gypsum wallboard, and
3. Tension -only braced frames.
Braced frames designed in accordance with the requirements of Section 2205.2.1.2 of this
Code may be designed as lateral -force -resisting elements in the direction normal to the
downhill direction, provided lateral forces do not induce flexural stresses in any member of
the frame. Deflections of frames shall account for the variation in slope of diagonal members
when the frame is not rectangular.
1613.7.10 Specific Design Provisions.
1613.7.10.1 Footings and Grade Beams. All footings and grade beams shall comply with the
following:
1. Grade beams shall extend at least 12 inches (305 mm) below the lowest adiacent grade
and provide a minimum 24 inch (610 mm) distance horizontally from the bottom outside
face of the grade beam to the face of the descending slope.
2. Continuous footings shall be reinforced with at least two No. 4 reinforcing bars at the top
and two No. 4 reinforcing bars at the bottom.
3. All main footing and grade beam reinforcement steel shall be bent into the intersecting
footing and fully developed around each corner and intersection.
4. All concrete stem walls shall extend from the foundation and reinforced as required for
concrete or masonry walls.
1613.7.10.2 Protection Against Decay and Termites. All wood to earth separation shall comply
with the following:
1. Where a footing or grade beam extends across a descending slope, the stem wall, grade
beam, or footing shall extend up to a minimum 18 inches (457 mm) above the highest
adiacent grade.
Exception: At paved garage and doorway entrances to the building, the stem wall
need only extend to the finished concrete slab, provided the wood framing is
protected with a moisture proof barrier.
2. Wood ledgers supporting a vertical load of more than 100 pounds per lineal foot (1.46
kN/m) based on Allowable Stress Design (ASD) levels and located within 48 inches
(1219 mm) of adjacent grade are prohibited. Galvanized steel ledgers and anchor bolts,
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with or without wood nailers, or treated or decay resistant sill plates supported on a
concrete or masonry seat, may be used.
1613.7.10.3 Sill Plates. All sill plates and anchorage shall comply with the following:
1. All wood framed walls, including nonbearing walls, when resting on a footing, foundation,
or grade beam stem wall, shall be supported on wood sill plates bearing on a level
surface.
2. Power -driven fasteners shall not be used to anchor sill plates except at interior
nonbearing walls not designed as shear walls.
1613.7.10.4 Column Base Plate Anchorage. The base of isolated wood posts (not framed into a
stud wall) supporting a vertical load of 4,000 pounds (17.8 kN) based on Allowable Stress Design
(ASD) levels or more and the base plate for a steel column shall comply with the following:
1. When the post or column is supported on a pedestal extending above the top of a footing
or grade beam, the pedestal shall be designed and reinforced as required for concrete or
masonry columns. The pedestal shall be reinforced with a minimum of four No. 4 bars
extending to the bottom of the footing or grade beam. The top of exterior pedestals shall
be sloped for positive drainage.
2. The base plate anchor bolts or the embedded portion of the post base, and the vertical
reinforcing bars for the pedestal, shall be confined with two No. 4 or three No. 3 ties
within the top 5 inches (127 mm) of the concrete or masonry pedestal. The base plate
anchor bolts shall be embedded a minimum of 20 bolt diameters into the concrete or
masonry pedestal. The base plate anchor bolts and post bases shall be galvanized and
each anchor bolt shall have at least 2 galvanized nuts above the base plate.
1613.7.10.5 Steel Beam to Column Supports. All steel beam to column supports shall be
Positively braced in each direction. Steel beams shall have stiffener plates installed on each side
of the beam web at the column. The stiffener plates shall be welded to each beam flange and the
beam web. Each brace connection or structural member shall consist of at least two 5/8 inch
(15.9 mm) diameter machine bolts.
RATIONALE:
Due to the difficulty of fire suppression vehicles accessing winding and narrow hillside properties and the
probabilities for future earthquakes in the Los Angeles region, this technical amendment is required to
address the special needs for buildings constructed on hillside locations. A joint Structural Engineers
Association of Southern California (SEAOSC) and both the Los Angeles County and Los Angeles City
Task Force investigated the performance of hillside building failures after the Northridge earthquake.
Numerous hillside failures resulted in loss of life and millions of dollars in damage. These criteria were
developed to minimize the damage to these structures and have been in use by both the City and County
of Los Angeles for several years with much success. This proposed amendment is a continuation of an
amendment adopted during previous code adoption cycles.
FINDINGS:
Local Topographical and Geological Conditions — The greater Los Angeles region is a densely populated
area having buildings and structures constructed over and near a vast array of fault systems capable of
producing major earthquakes, including but not limited to the recent 1994 Northridge Earthquake.
Additionally, the topography within the Los Angeles region includes significant hillsides with narrow and
winding access that makes timely response by fire suppression vehicles challenging and difficult. The
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proposed modification establishes design parameters to better mitigate and limit property damage that
are the results of increased seismic forces which are imparted upon hillside buildings and structures and
therefore need to be incorporated into the code to assure that new buildings and structures and additions
or alterations to existing buildings or structures are designed and constructed in accordance with the
scope and objectives of the California Building Code.
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2016 LARUCP 16-06. Section 1613.8 is added to Chapter 16 of the 2016 Edition of the California
Building Code to read as follows:
1613.8 Suspended Ceilings. Minimum design and installation standards for suspended ceilings shall be
determined in accordance with the requirements of Section 2506.2.1 of this Code and this section.
1613.8.1 Scope. This part contains special requirements for suspended ceilings and lighting systems.
Provisions of Section 13.5.6 of ASCE 7 shall apply except as modified herein.
1613.8.2 General. The suspended ceilings and lighting systems shall be limited to 6 feet (1828 mm)
below the structural deck unless the lateral bracing is designed by a licensed engineer or architect.
1613.8.3 Sprinkler Heads. All sprinkler heads (drops) except fire -resistance -rated floor/ceiling or
roof/ceiling assemblies, shall be designed to allow for free movement of the sprinkler pipes with
oversize rings, sleeves or adaptors through the ceiling tile. Sprinkler heads and other penetrations
shall have a 2 inch (50mm) oversize ring, sleeve, or adapter through the ceiling tile to allow for free
movement of at least 1 inch (25mm) in all horizontal directions. Alternatively, a swing joint that can
accommodate 1 inch (25 mm) of ceiling movement in all horizontal directions is permitted to be
provided at the top of the sprinkler head extension.
Sprinkler heads penetrating fire -resistance -rated floor/ceiling or roof/ceiling assemblies shall comply
with Section 714 of this Code.
1613.8.4 Special Requirements for Means of Egress. Suspended ceiling assemblies located along
means of egress serving an occupant load of 30 or more shall comply with the following provisions.
1613.8.4.1 General. Ceiling suspension systems shall be connected and braced with vertical
hangers attached directly to the structural deck along the means of egress serving an occupant
load of 30 or more and at lobbies accessory to Group A Occupancies. Spacing of vertical hangers
shall not exceed 2 feet (610 mm) on center along the entire length of the suspended ceiling
assembly located along the means of egress or at the lobby.
1613.8.4.2 Assembly Device. All lay -in panels shall be secured to the suspension ceiling
assembly with two hold-down clips minimum for each tile within a 4 -foot (1219 mm) radius of the
exit lights and exit signs.
1613.8.4.3 Emergency Systems. Independent supports and braces shall be provided for light
fixtures required for exit illumination. Power supply for exit illumination shall comply with the
requirements of Section 1008.3 of this Code.
1613.8.4.4 Supports for Appendage. Separate support from the structural deck shall be
provided for all appendages such as light fixtures, air diffusers, exit signs, and similar elements.
RATIONALE:
The California Building Code has little to no information regarding the safe design and construction
requirements for ceiling suspension systems subject to seismic loads. It is through the experience of prior
earthquakes, such as the Northridge Earthquake, that this amendment is proposed so as to minimize the
amount of bodily and building damage within the spaces in which this type of ceiling will be installed. This
proposed amendment complements ASCE 7-10 Chapter 13 Section 13.5.6.2.2 and the cited reference to
ASTM E580. The amended requirements retained herein are a continuation of portions of an amendment
adopted during the previous code adoption cycles.
FINDINGS:
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Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings constructed over and near a vast array of fault systems capable of producing major
earthquakes, including but not limited to the 1994 Northridge Earthquake. The proposed modification
requiring safe design and construction requirements for ceiling suspension systems to resist seismic
loads is intended to minimize the amount of damage within a building and therefore need to be
incorporated into the code to assure that new buildings and additions to existing buildings are designed
and constructed in accordance with the scope and objectives of the California Building Code.
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2016 LARUCP 17-01. Section 1704.6 of the 2016 Edition of the California Building Code is amended to
read as follows:
1704.6 Structural Observations. Where required by the provisions of Section 1704.6.1 or 1704.6.2, the
owner or the owner's authorized agent shall employ a registe,-ea desigR pFefessme ' structural observer
to perform structural observations. Structural observation does not include or waive the responsibility for
the inspections in Section 110 or the special inspections in Section 1705 or other section of this code.
The structural observer shall be one of the following individuals:
1. The registered design professional responsible for the structural design, or
2. A registered design professional designated by the registered design professional responsible for
the structural design.
Prior to the commencement of observations, the structural observer shall submit to the building
official a written statement identifying the frequency and extent of structural observations.
building effiGial a written statement that the site vi-sit.s have beep made and ideRtify any repGrted
The owner or owner's authorized agent shall coordinate and call a preconstruction meeting between
the structural observer, contractors, affected subcontractors and special inspectors. The structural
observer shall preside over the meeting. The purpose of the meeting shall be to identify the major
structural elements and connections that affect the vertical and lateral load resisting systems of the
structure and to review scheduling of the required observations. A record of the meeting shall be included
in the report submitted to the Building Official.
Observed deficiencies shall be reported in writing to the owner or owner's authorized agent, special
inspector, contractor and the Building Official. Upon the form prescribed by the Building Official, the
structural observer shall submit to the Building Official a written statement at each significant construction
stage stating that the site visits have been made and identifying any reported deficiencies which, to the
best of the structural observer's knowledge, have not been resolved. A final report by the structural
observer which states that all observed deficiencies have been resolved is required before acceptance of
the work by the Building Official.
RATIONALE:
The language in Section 1704.6 of the California Building Code permits the owner to employ any
registered design professional to perform structural observations with minimum guideline. However, it is
important to recognize that the registered design professional responsible for the structural design has
thorough knowledge of the building he/she designed. By requiring the registered design professional
responsible for the structural design or their designee who were involved with the design to observe the
construction, the quality of the observation for major structural elements and connections that affect the
vertical and lateral load resisting systems of the structure will greatly be increased. Additional
requirements are provided to help clarify the role and duties of the structural observer'and the method of
reporting and correcting observed deficiencies to the building official. This proposed amendment is a
continuation of an amendment adopted during previous code adoption cycles.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the 1994 Northridge Earthquake. The proposed
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modification to require the registered design professional in responsible charge for the structural design to
observe the construction will help ensure acceptable standards of workmanship is provided and to
improve the quality of the observation and therefore need to be incorporated into the code to assure that
new buildings and structures and additions or alterations to existing buildings or structures are designed
and constructed in accordance with the scope and objectives of the California Building Code.
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2016 LARUCP 17-02. Section 1704.6.1 of the 2016 Edition of the California Building Code is amended to
read as follows:
1704.6.1 Structural observations for seismic resistance. Structural observations shall be provided for
those structures assigned to Seismic Design Category D, E or F, where one or more of the following
conditions exist:
1. The structure is classified as Risk Category III or IV in accordance with Table 1604.5.
2. The height of the structure is greater than 75 feet (22860 mm) above the base.
3. The structure is -assigned to Seismic Design GategeFy-E, is classified as Risk Category I or II in
accordance with Table 1604.5, and is greater than s
-b0f- � stGries abGve grade plane a
lateral design is required for the structure or portion thereof.
Exception: One-story wood framed Group R-3 and Group U Occupancies less than 2,000
square feet in area, provided the adjacent grade is not steeper than 1 unit vertical in 10 units
horizontal (10% sloped), assigned to Seismic Design Category D.
4. When so designated by the registered design professional responsible for the structural design.
5. When such observation is specifically required by the building official.
RATIONALE:
With the higher seismic demand placed on buildings and structures in this region, the language in Section
1704.6.1 of the California Building Code would permit many low-rise buildings and structures with
complex structural elements to be constructed without the benefit of a structural observation. By requiring
a registered design professional to observe the construction, the quality of the observation for major
structural elements and connections that affect the vertical and lateral load resisting systems of the
structure will greatly be increased. An exception is provided to permit simple structures and buildings to
be excluded. This proposed amendment is a continuation of an amendment adopted during previous
code adoption cycles.
FINDINGS:
Local Geological Conditions - The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the 1994 Northridge Earthquake. The proposed
modification to require the registered design professional in responsible charge for the structural design to
observe the construction will help ensure acceptable standards of workmanship is provided and to
improve the quality of the observation and therefore need to be incorporated into the code to assure that
new buildings and structures and additions or alterations to existing buildings or structures are designed
and constructed in accordance with the scope and objectives of the California Building Code.
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2016 LARUCP 17-03. Section 1705.3 of the 2016 Edition of the California Building Code is amended to
read as follows:
1705.3 Concrete Construction. The special inspections and tests for concrete construction shall be
performed in accordance with this section and Table 1705.3.
Exceptions: Special inspections and tests shall not be required for:
1. Isolated spread concrete footings of buildings three stories or less above grade plane that are
fully supported on earth or rock, where the structural design of the footing is based on a specified
compressive strength, fc, no greater than 2.500 pounds per square inch (psi) (17.2 Mpa)
regardless of the compressive strength specified in the construction documents or used in the
footing construction.
2. Continuous concrete footings supporting walls of buildings three stories or less above grade
plane that are fully supported on earth or rock where:
2.1. The footings support walls of light -frame construction;
2.2. The footings are designed in accordance with Table 1809.7; or
2.3. The structural design of the footing is based on a specified compressive strength, f c, no
greater than 2,500 pounds per square inch (psi) (17.2 Mpa), regardless of the compressive
strength specified in the construction documents or used in the footing construction.
3. Nonstructural concrete slabs supported directly on the ground, including prestressed slabs on
grade, where the effective prestress in the concrete is less than 150 psi (1.03 Mpa).
64. Concrete patios, driveways and sidewalks, on grade.
RATIONALE:
Results from studies after the 1994 Northridge Earthquake indicated that a lot of the damage was
attributed to a lack of quality control during construction resulting in poor performance of the building or
structure. Therefore, the proposed amendment requires special inspection for concrete with a
compressive strength greater than 2,500 pounds per square inch. This proposed amendment is a
continuation of an amendment adopted during previous code adoption cycles.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the 1994 Northridge Earthquake. The proposed
modification to require special inspection for concrete with a compressive strength greater than 2,500 psi
to improve quality of control during construction and therefore need to be incorporated into the code to
assure that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Building Code.
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2016 LARUCP 17-04. Exception 3 of Section 1705.12 of the 2016 Edition of the California Building Code
is amended to read as follows:
1705.12 Special inspections for seismic resistance. Special inspections for seismic resistance shall be
required as specified in Sections 1705.12.1 through 1705.12.9, unless exempted by the exceptions of
Section 1704.2.
Exception: The special inspections specified in Sections 1705.12.1 through 1705.12.9 are not
required for structures designed and constructed in accordance with one of the following:
1. The structure consists of light -frame construction; the design spectral response acceleration
at short periods, SDS, as determined in Section 1613.3.4, does not exceed 0.5; and the
building height of the structure does not exceed 35 feet (10 668 mm)
2. The seismic force -resisting system of the structure consists of reinforced masonry or
reinforced concrete; the design spectral response acceleration at short periods, SDS, as
determined in Section 1613.3.4, does not exceed 0.5; and the building height of the structure
does not exceed 25 feet (7620 mm)
3. The structure is a detached one- or two-family dwelling not exceeding two stories above
grade plane, is not assigned to Seismic Design Category D, E or F and does not have any of
the following horizontal or vertical irregularities in accordance with Section 12.3 of ASCE 7:
3.1 Torsional or extreme torsional irregularity.
3.2 Nonparallel systems irregularity.
3.3 Stiffness -soft story or stiffness -extreme soft story irregularity.
3.4 Discontinuity in lateral strength -weak story irregularity.
RATIONALE:
In Southern California, very few detached one- or two-family dwellings not exceeding two stories above
grade plane are built as "box -type" structures, especially those in hillside areas and near the oceanfront.
Many steel moment frames or braced frames and/or cantilevered columns within buildings can still be
shown as "regular" structures by calculations. With the higher seismic demand placed on buildings and
structures in this region, the language in Section 1705.12 Exception 3 of the California Building Code
would permit many detached one- or two-family dwellings not exceeding two stories above grade plane
with complex structural elements to be constructed without the benefit of special inspections. By requiring
special inspections, the quality of major structural elements and connections that affect the vertical and
lateral load resisting systems of the structure will greatly be increased. The exception should only be
allowed for detached one- or two-family dwellings not exceeding two stories above grade plane assigned
to Seismic Design category A, B and C.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the 1994 Northridge Earthquake. The proposed
modification to require special inspections for detached one- or two-family dwellings not exceeding two
stories above grade plane assigned to Seismic Design Category D, E and F will help ensure that
acceptable standards of workmanship and quality of construction are provided and therefore needs to be
incorporated into the code to assure that new buildings and structures and additions or alterations to
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existing buildings or structures are designed and constructed in accordance with the scope and objectives
of the California Building Code.
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2016 LARUCP 18-01. Section 1807.1.4 of the 2016 Edition of the California Building Code is amended to
read as follows:
1807.1.4 Permanent wood foundation systems. Permanent wood foundation systems shall be
designed and installed in accordance with AWC PWF. Lumber and plywood shall be treated in
accordance with AWPA U1 (Commodity Specification A, Use Category 4B and Section 5.2) and shall be
identified in accordance with Section 2303.1.9.I. -Perm anent wood foundation systems shall not be used
for structures assigned to Seismic Design Category D, E or F.
RATIONALE:
No substantiating data has been provided to show that wood foundation systems are effective in
supporting buildings and structures during a seismic event while being subject to deterioration caused by
the combined detrimental effects of constant moisture in the soil and wood -destroying organisms. Wood
foundation systems not properly treated and protected against deterioration, have performed very poorly
and have led to slope failures. Most contractors are typically accustomed to construction in dry and
temperate weather in the Southern California region and are not generally familiar with the necessary
precautions and treatment of wood that makes it suitable for both seismic events and wet applications.
The proposed amendment takes the precautionary steps to reduce or eliminate potential problems that
may result in using wood foundation systems that experience relatively rapid decay due to the fact that
the region does not experience temperatures cold enough to destroy or retard the growth and proliferation
of wood -destroying organisms. This proposed amendment is a continuation of an amendment adopted
during previous code adoption cycles.
FINDINGS:
Local Climatic and Geological Conditions — The greater Los Angeles region is a densely populated area
having buildings and structures constructed over and near a vast array of fault systems capable of
producing major earthquakes, including but not limited to the 1994 Northridge Earthquake. In addition, the
region is within a climate system capable of producing major winds, fire and rain related disasters,
including but not limited to those caused by the Santa Ana winds and EI Nino (or La Nina) subtropical -like
weather. This region is especially susceptible to more active termite and wood attacking insects and
microorganisms. The proposed modification to prohibit the use of wood foundation systems as well as
limit prescriptive design provisions in an effort to mitigate potential problems or deficiencies due to the
proliferation of wood -destroying organisms and therefore needs to be incorporated into the code to
assure that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Building Code.
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2016 LARUCP 18-02. Section 1807.1.6 of the 2016 Edition of the California Building Code is amended to
read as follows:
1807.1.6 Prescriptive design of concrete and masonry foundation walls. Concrete and masonry
foundation walls that are laterally supported at the top and bottom shall be permitted to be designed and
constructed in accordance with this section. Prescriptive design of foundation walls shall not be used for
structures assigned to Seismic Design Category D. E or F.
RATIONALE:
With the higher seismic demand placed on buildings and structures in this region, it is deemed necessary
to take precautionary steps to reduce or eliminate potential problems that may result by following
prescriptive design provisions that does not take into consideration the surrounding environment. Plain
concrete performs poorly in withstanding the cyclic forces resulting from seismic events. In addition, no
substantiating data has been provided to show that under -reinforced foundation walls are effective in
resisting seismic loads and may potentially lead to a higher risk of failure. It is important that the benefit
and expertise of a registered design professional be obtained to properly analyze the structure and take
these issues into consideration. This proposed amendment is a continuation of an amendment adopted
during previous code adoption cycles.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the 1994 Northridge Earthquake. The proposed
modification to prohibit prescriptive design provisions for foundation walls as plain concrete have
performed poorly in withstanding the cyclic forces resulting from seismic events and to require the walls to
be designed by a registered design professional to ensure that the proper analysis of the structure takes
into account the surrounding condition and therefore need to be incorporated into the code to assure that
new buildings and structures and additions or alterations to existing buildings or structures are designed
and constructed in accordance with the scope and objectives of the California Building Code.
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2016 LARUCP 18-03. Section 1809.3 of the 2016 Edition of the California Building Code is amended to
read as follows:
1809.3 Stepped footings. The top surface of footings shall be level. The bottom surface of footings shall
be permitted to have a slope not exceeding one unit vertical in 10 units horizontal (10 -percent slope).
Footings shall be stepped where it is necessary to change the elevation of the top surface of the footing
or where the surface of the ground slopes more than one unit vertical in 10 units horizontal (10 -percent
slope).
For structures assigned to Seismic Design Category D, E or F, the stepping requirement shall also
apply to the top surface of grade beams supporting walls. Footings shall be reinforced with four No. 4
bars. Two bars shall be place at the top and bottom of the footings as shown in Figure 1809.3.
REC01'] EM: a > b
a
b S 10'
�--NUN, 2-e4 REBAR {TOP & BOTTi}Nl
�b
-BOTTOM PLATE (rYP.)
GRADE
111111� lilt 131;;-1--
=[lll;✓=Illy
M1111M °=I111M
STEPPED FOLIN9 ATIONS
FIGURE 1809.3
STEPPED FOOTING
RATIONALE:
With the higher seismic demand placed on buildings and structures in this region, precautionary steps are
proposed to reduce or eliminate potential problems that may result for under reinforced footings located
on sloped surfaces. Requiring minimum reinforcement for stepped footings is intended to address the
problem of poor performance of plain or under -reinforced footings during a seismic event. This proposed
amendment is a continuation of an amendment adopted during previous code adoption cycles.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to require minimum reinforcement in stepped footings is intended to improve performance of
buildings and structures and therefore need to be incorporated into the code to assure that new buildings
and structures and additions or alterations to existing buildings or structures are designed and
constructed in accordance with the scope and objectives of the California Building Code.
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2016 LARUCP 18-04. Section 1809.7 and Table 1809.7 of the 2016 Edition of the California Building
Code are amended to read as follows:
1809.7 Prescriptive footings for light -frame construction. Where a specific design is not provided,
concrete or masonry -unit footings supporting walls of light -frame construction shall be permitted to be
designed in accordance with Table 1809.7. Prescriptive footings in Table 1809.7 shall not exceed one
story above grade plane for structures assigned to Seismic Design Category D, E or F.
TABLE 1809.7
PRESCRIPTIVE FOOTINGS SUPPORTING WALLS OF
LIGHT -FRAME CONSTRUCTION a, b, c, d, e
NUMBER OF FLOORS SUPPORTED
BY THE FOOTING f
WIDTH OF FOOTING
(inches)
THICKNESS OF
FOOTING (inches)
1
12
6
2
15
6
3
18
8%
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm
a. Depth of footings shall be in accordance with Section 1809.4.
b. The ground under the floor shall be permitted to be excavated to the elevation of the top of the footing.
C.
Intprapr ;t- 0 -hp Fong walls shall be peFFRitted to be suppeked by iselated f9etiRgs. The feeting vAdth and leRgth shall be
NA.4rp thp i.A.drith sheym ap this table, and fe0tiRgS shall be spaGed net mere thim R faRt OR . Not Adopted.
d. See Section 1908 for additional requirements for concrete footings of structures assigned to Seismic Design Category
C, D, E or F.
e. For thickness of foundation walls, see Section 1807.1.6.
f. Footings shall be permitted to support a roof addition to the stipulated number of floors. Footings supporting roof only
shall be as required for supporting one floor.
Q PlaiR . .ete f09tiRgS fGF r_...,,., o_3 , e shall be . .,hied to be 6 inrhe- thirk
RATIONALE:
No substantiating data has been provided to show that under -reinforced footings are effective in resisting
seismic loads and may potentially lead to a higher risk of failure. Therefore, this proposed amendment
requires minimum reinforcement in continuous footings to address the problem of poor performance of
plain or under -reinforced footings during a seismic event. With the higher seismic demand placed on
buildings and structures in this region, precautionary steps are proposed to reduce or eliminate potential
problems that may result by following prescriptive design provisions for footing that does not take into
consideration the surrounding environment. It was important that the benefit and expertise of a registered
design professional be obtained to properly analyze the structure and take these issues into
consideration. This amendment reflects the recommendations by the Structural Engineers Association of
Southern California (SEAOSC) and the Los Angeles City Task Force that investigated the poor
performance observed in the 1994 Northridge Earthquake. This proposed amendment is a continuation of
an amendment adopted during previous code adoption cycles.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to limit the use of the prescriptive design provisions and under -reinforced or plain concrete is
to ensure that the proper analysis of the structure takes into account the surrounding condition and
therefore need to be incorporated into the code to assure that new buildings and structures and additions
or alterations to existing buildings or structures are designed and constructed in accordance with the
scope and objectives of the California Building Code.
2016 Edition of the California Building Code Page 33 of 118
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2016 LARUCP 18-05. Section 1809.12 of the 2016 Edition of the California Building Code is amended to
read as follows:
1809.12 Timber footings. Timber footings shall be permitted for buildings of Type V construction and as
otherwise approved by the building official. Such footings -shall be treated in accordance with AWPA U1
(Commodity Specification A, Use Category 4B). Treated timbers are not required where placed entirely
below permanent water level, or where used as capping for wood piles that project above the water level
over submerged or marsh lands. The compressive stresses perpendicular to grain in untreated timber
footing supported upon treated piles shall not exceed 70 percent of the allowable stresses for the species
and grade of timber as specified in the °F&PAANSI/AWC NDS. Timber footings shall not be used in
structures assigned to Seismic Design Category D, E or F.
RATIONALE:
No substantiating data has been provided to show that timber footings are effective in supporting
buildings and structures during a seismic event, especially while being subjected to deterioration caused
by the combined detrimental effects of moisture in the soil and wood -destroying organisms. Timber
footings, when they are not properly treated and protected against deterioration, have performed very
poorly. Most contractors are typically accustomed to construction in dry and temperate weather in the
Southern California region and are not generally familiar with the necessary precautions and treatment of
wood that makes it suitable for both seismic event and wet applications. The proposed amendment takes
the precautionary steps to reduce or eliminate potential problems that may result by using timber footings
that experience relatively rapid decay due to the face that the region does not experience temperatures
cold enough to destroy or retard the growth and proliferation of wood -destroying organisms. This
proposed amendment is a continuation of an amendment adopted during previous code adoption cycles.
FINDINGS:
Local Climatic and Geological Conditions — The greater Los Angeles region is a densely populated area
having buildings and structures constructed over and near a vast array of fault systems capable of
producing major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. In
addition, the region is within a climate system capable of producing major winds, fire and rain related
disasters, including but not limited to those caused by the Santa Ana winds and EI Nino (or La Nina)
subtropical -like weather. This region is especially susceptible to more active termite and wood attacking
insects and microorganisms. The proposed modification to prohibit the use of timber footings in an effort
to mitigate potential problems or deficiencies due to the proliferation of wood -destroying organisms and
therefore need to be incorporated into the code to assure that new buildings and structures and additions
or alterations to existing buildings or structures are designed and constructed in accordance with the
scope and objectives of the California Building Code.
2016 Edition of the California Building Code Page 34 of 118
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2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 18-06. Section 1810.3.2.4 of the 2016 Edition of the California Building Code is amended
to read as follows:
1810.3.2.4 Timber. Timber deep foundation elements shall be designed as piles or poles in accordance
with A.., &P- ANSI/AWC NDS. Round timber elements shall conform to ASTM D 25. Sawn timber elements
shall conform to DOC PS -20. Timber shall not be used in structures assigned to Seismic Design Category
D. E or F.
RATIONALE:
No substantiating data has been provided to show that timber deep foundation is effective in supporting
buildings and structures during a seismic event while being subject to deterioration caused by the
combined detrimental effect of constant moisture in the soil and wood -destroying organisms. Timber deep
foundation, when they are not properly treated and protected against deterioration, has performed very
poorly. Most contractors are typically accustomed to construction in dry and temperate weather in the
Southern California region and are not generally familiar with the necessary precautions and treatment of
wood that makes it suitable for both seismic event and wet applications. The proposed amendment takes
the precautionary steps to reduce or eliminate potential problems that may result by using timber deep
foundation that experience relatively rapid decay due to the face that the region does not experience
temperatures cold enough to destroy or retard the growth and proliferation of wood -destroying organisms.
This proposed amendment is a continuation of an amendment adopted during previous code adoption
cycles.
FINDINGS:
Local Climatic and Geological Conditions — The greater Los Angeles region is a densely populated area
having buildings and structures constructed over and near a vast array of fault systems capable of
producing major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. In
addition, the region is within a climate system capable of producing major winds, fire and rain related
disasters, including but not limited to those caused by the Santa Ana winds and EI Nino (or La Nina)
subtropical -like weather. This region is especially susceptible to more active termite and wood attacking
insects and microorganisms. The proposed modification to prohibit the use of timber deep foundation in
an effort to mitigate potential problems or deficiencies due to the proliferation of wood -destroying
organisms and therefore need to be incorporated into the code to assure that new buildings and
structures and additions or alterations to existing buildings or structures are designed and constructed in
accordance with the scope and objectives of the California Building Code.
2016 Edition of the California Building Code Page 35 of 118
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 19-01. Section 1905.1.7 of the 2016 Edition of the California Building Code is amended to
read as follows:
1906.1.7 ACI 318, Section 14.1.4. Delete ACI 318, Section 14.1.4, and replace with the following:
14.1.4 - Plain concrete in structures assigned to Seismic Design Category C, D, E or F.
14.1.4.1 - Structures assigned to Seismic Design Category C, D, E or F shall not have elements of
structural plain concrete, except as follows:
(a) StrUGklral plain rGe-prug9te basement, foundatipap Or A-ther 144 -AUS b090144 Me hase as apAped ip
ASCE �-are�aermitted-ia-eetas#edheight GGn tnur_,taad With �;�and h^in fm6^ dweAkW three eres r Ie
os in
s.
D OF C the height of the ^.all shall note eed 8 f et (243 7 mml the thiokne shall not ho
loos than 71/_ ; ehes (490 mml and the Wall shall retain n mem than A feet (4249 mml of
.nbalaneed fill Walls shall have r infer ent in eeordanee with 14 a.1. Concrete used for
fill with a minimum cement content of two (2) sacks of Portland cement or cementious
material per cubic yard.
(b) Isolated footings of plain concrete supporting pedestals or columns are permitted, provided
the projection of the footing beyond the face of the supported member does not exceed the
footing thickness.
€XGePcivR.-- /P eta r -bed oRe and two fami4e d^ e&ngs thre sfries er less .n he4ht the
Footing th;e Loess
(c) Plain concrete footings supporting walls are permitted provided the footings have at least two
continuous longitudinal reinforcing bars. Bars shall not be smaller than No. 4 and shall have a
total area of not less than 0.002 times the gross cross-sectional area of the footing. F�
f stings that a eed 8 iaGhes (203 mR 1 in thfebness aA minimum of one bar shall be
provided at the top and bottom of the footing. Continuity of reinforcement shall be provided at
corners and intersections.
Exceptions:
1 fn ceisn* Design Gategeries A ❑ and Q Detached one- and two-family dwellings three
stories or less in height and constructed with stud -bearing walls, are permitted to have
plain concrete footings w4ho„t longitudinal feint reement with at least two continuous
lonaitudinal reinforcina bars not smaller than No. 4 are permitted to have a total area of
less than 0.002 times the gross cross-sectional area of the footing.
Far- f„ndatien &Y8teFn8 GGRSWiRg Of a-PtaiR GGFIGfete-f9gtiRg
stemwall a n4inimum of one bar shot/ be n v;ded at the fn of f
bottom of the a e feegRg
Where a slab On gFgUnd ;s ast menefiMieal y with the AqetingL, footingon
to he Isoated at either the ten of the slab or bottom of the f otOg
RATIONALE:
This proposed amendment requires minimum reinforcement in continuous footings to address the
problem of poor performance of plain or under -reinforced footings during a seismic event. This
amendment reflects the recommendations by the Structural Engineers Association of Southern California
(SEAOSC) and the Los Angeles City Joint Task Force that investigated the poor performance observed in
2016 Edition of the California Building Code Page 36 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
1994 Northridge Earthquake. This proposed amendment is a continuation of an amendment adopted
during previous code adoption cycles.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to require minimum reinforcement to address the problem of poor performance of plain or
under -reinforced footings during a seismic event and therefore need to be incorporated into the code to
assure that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Building Code.
2016 Edition of the California Building Code Page 37 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 19-02. Section 1905.1 is amended and Sections 1905.1.9 thru 1905.1.11 are added to
Chapter 19 of the 2016 Edition of the California Building Code to read as follows:
1905.1 General. The text of ACI 318 shall be modified as indicated in Sections 1905.1.1 through
I on�v1905.1.11.
1905.1.9 ACI 318, Section 18.7.5. Modify ACI 318, Section 18.7.5, by adding Section 18.7.5.7 and
18.7.5.8 as follows:
18.7.5.7 Where the calculated point of contraflexure is not within the middle half of the member clear
height, provide transverse reinforcement as specified in ACI 318 Sections 18.7.5.1, Items (a) through
(c), over the full height of the member.
18.7.5.8 — At any section where the design strength, mPn, of the column is less than the sum of the
shears Ve computed in accordance with ACI 318 Sections 18.7.6.1 and 18.6.5.1 for all the beams
framing into the column above the level under consideration, transverse reinforcement as specified in
ACI 318 Sections 18.7.5.1 through 18.7.5.3 shall be provided. For beams framing into opposite sides
of the column, the moment components are permitted to be assumed to be of opposite sign. For the
determination of the design strength, �2& of the column, these moments are permitted to be
assumed to result from the deformation of the frame in any one principal axis.
1905.1.10 ACI 318, Section 18.10.4. Modify ACI 318, Section 18.10.4, by adding Section 18.10.4.6 as
follows:
18.10.4.6 —Walls and portions of walls with P > 0.35Po shall not be considered to contribute to the
calculated shear strength of the structure for resisting earthquake -induced forces. Such walls shall
conform to the requirements ofACI 318 Section 18.14.
1905.1.11 ACI 318, Section 18.12.6. Modify ACI 318, by adding Section 18.12.6.2 as follows:
18.12.6.2 Collector and boundary elements in topping slabs placed over precast floor and roof
elements shall not be less than 3 inches (76 mm) or 6 d,, in thickness, where d,, is the diameter of the
largest reinforcement in the toppinq slab.
RATIONALE:
This amendment is intended to carry over critical provisions for the design of concrete columns in moment
frames from the legacy 1997 Uniform Building Code. Increased confinement is critical to the integrity of
such columns and these modifications ensure that it is provided when certain thresholds are exceeded.
In addition, this amendment carries over from the legacy 1997 Uniform Building Code a critical provision
for the design of concrete shear walls. It essentially limits the use of very highly gravity -loaded walls in
being included in the seismic load resisting system, since their failure could have catastrophic effect on
the building.
Furthermore, this amendment was incorporated in the code based on observations from the 1994
Northridge Earthquake. Rebar placed in very thin concrete topping slabs have been observed in some
instances to have popped out of the slab due to insufficient concrete coverage. This modification ensures
that critical boundary and collector rebars are placed in sufficiently thick topping slab to prevent buckling
of such reinforcements.
This proposed amendment is a continuation of an amendment adopted during previous code adoption
cycles.
2016 Edition of the California Building Code Page 38 of 118
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FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to increase confinement in critical columns, limiting the use of highly gravity loaded walls,
and increase concrete coverage in thin slabs will have to prevent failure of the structure and therefore
need to be incorporated into the code to assure that new buildings and structures and additions or
alterations to existing buildings or structures are designed and constructed in accordance with the scope
and objectives of the California Building Code.
2016 Edition of the California Building Code Page 39 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 23-01. Section 2304.10.1 of the 2016 Edition of the California Building Code is amended
to read as follows:
2304.10.1 Fastener requirements. Connections for wood members shall be designed in accordance
with the appropriate methodology in Section 2301.2. The number and size of fasteners connecting wood
members shall not be less than that set forth in Table 2304.10.1. Staple fasteners in Table 2304.10.1
shall not be used to resist or transfer seismic forces in structures assigned to Seismic Design Category D.
EorF.
Exception: Staples may be used to resist or transfer seismic forces when the allowable shear values
are substantiated by cyclic testing and approved by the building official.
RATIONALE:
Due to the high geologic activities in the Southern California area and the expected higher level of
performance on buildings and structures, this proposed local amendment limit the use of staple fasteners
in resisting or transferring seismic forces. In September 2007, limited cyclic testing data was provided to
the ICC Los Angeles Chapter Structural Code Committee showing that stapled wood structural shear
panels do not exhibit the same behavior as the nailed wood structural shear panels. The test results of
the stapled wood structural shear panels appeared much lower in strength and drift than the nailed wood
structural shear panel test results. Therefore, the use of staples as fasteners to resist or transfer seismic
forces shall not be permitted without being substantiated by cyclic testing. This proposed amendment is a
continuation of a similar amendment adopted during previous code adoption cycles.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to limit the use of staple fasteners to resist or transfer seismic load improve the performance
of buildings and structures during a seismic event and therefore need to be incorporated into the code to
assure that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Building Code.
2016 Edition of the California Building Code Page 40 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 23-02. Section 2304.12.5 of the 2016 Edition of the California Building Code is amended
to read as follows:
2304.12.5 Wood used in retaining walls and cribs. Wood installed in retaining or crib walls shall be
preservative treated in accordance with AWPA U1 for soil and fresh water use. Wood shall not be used in
retaining or crib walls for structures assigned to Seismic Design Category D, E or F.
RATIONALE:
No substantiating data has been provided to show that wood used in retaining or crib walls are effective in
supporting buildings and structures during a seismic event while being subject to deterioration caused by
the combined detrimental effect of constant moisture in the soil and wood -destroying organisms. Wood
used in retaining or crib walls, when they are not properly treated and protected against deterioration,
have performed very poorly. Most contractors are typically accustomed to construction in dry and
temperate weather in the Southern California region and are not generally familiar with the necessary
precautions and treatment of wood that makes it suitable for both seismic event and wet applications. The
proposed amendment takes the precautionary steps to reduce or eliminate potential problems that may
result by using wood in retaining or crib walls that experience relatively rapid decay due to the face that
the region does not experience temperatures cold enough to destroy or retard the growth and proliferation
of wood -destroying organisms. This proposed amendment is a continuation of an amendment adopted
during previous code adoption cycles.
FINDINGS:
Local Climatic and Geological Conditions — The greater Los Angeles region is a densely populated area
having buildings and structures constructed over and near a vast array of fault systems capable of
producing major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. In
addition, the region is within a climate system capable of producing major winds, fire and rain related
disasters, including but not limited to those caused by the Santa Ana winds and EI Nino (or La Nina)
subtropical -like weather. This region is especially susceptible to more active termite and wood attacking
insects and microorganisms. The proposed modification to prohibit the use of wood in retaining or crib
walls in an effort to mitigate potential problems or deficiencies due to the proliferation of wood -destroying
organisms and therefore need to be incorporated into the code to assure that new buildings and
structures and additions or alterations to existing buildings or structures are designed and constructed in
accordance with the scope and objectives of the California Building Code.
2016 Edition of the California Building Code Page 41 of 118
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 23-03. Section 2305.4 is added to Chapter 23 of the 2016 Edition of the California
Building Code to read as follows:
2305.4 Quality of Nails. In Seismic Design Category D, E or F, mechanically driven nails used in wood
structural panel shear walls shall meet the same dimensions as that required for hand -driven nails,
including diameter, minimum length and minimum head diameter. Clipped head or box nails are not
permitted in new construction. The allowable design value for clipped head nails in existing construction
may be taken at no more than the nail -head -area ratio of that of the same size hand -driven nails.
RATIONALE:
The overdriving of nails into the structural wood panel still remains a concern when pneumatic nail guns
are used for wood structural panel shear wall nailing. Box nails were observed to cause massive and
multiple failures of the typical 3/8 -inch thick plywood during the 1994 Northridge Earthquake. The use of
clipped head nails as allowed in Table Al of AFPA SDPWS footnote referencing to ASTM F1667,
continues to be restricted from being used in wood structural panel shear walls where the minimum nail
head size must be maintained in order to minimize nails from pulling through sheathing materials. Clipped
or mechanically driven nails used in wood structural panel shear wall construction were found to perform
much less in previous wood structural panel shear wall testing done at the University of California Irvine.
The existing test results indicated that, under cyclic loading, the wood structural panel shear walls were
less energy absorbent and less ductile. The panels reached ultimate load capacity and failed at
substantially less lateral deflection than those using same size hand -driven nails. This amendment
reflects the recommendations by the Structural Engineers Association of Southern California (SEAOSC)
and the Los Angeles City Joint Task Force that investigated the poor performance observed in 1994
Northridge Earthquake. This proposed amendment is a continuation of an amendment adopted during
previous code adoption cycles.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to require mechanically driven nails to have the same dimensions as hand -driven nail will
result in improved quality of construction and performance of wood structural panel shear walls and
therefore need to be incorporated into the code to assure that new buildings and structures and additions
or alterations to existing buildings or structures are designed and constructed in accordance with the
scope and objectives of the California Building Code.
2016 Edition of the California Building Code Page 42 of 118
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 23-04. Section 2305.5 is added to Chapter 23 of the 2016 Edition of the California
Building Code to read as follows:
2305.5 Hold-down connectors. In Seismic Design Category D, E or F, hold-down connectors shall be
designed to resist shear wall overturning moments using approved cyclic load values or 75 percent of the
allowable seismic load values that do not consider cyclic loading of the product. Connector bolts into
wood framing shall require steel plate washers on the post on the opposite side of the anchorage device.
Plate size shall be a minimum of 0.229 inch by 3 inches by 3 inches (5.82 mm by 76 mm by 76 mm) in
size. Hold-down connectors shall be tightened to finger tight plus one half (1/2) wrench turn lust prior to
covering the wall framing.
RATIONALE:
ICC -ES AC 155 Acceptance Criteria for Hold-downs (Tie -Downs) Attached to Wood Members is widely
used to establish allowable values for hold-down connectors in evaluation reports. AC 155 uses
monotonic loading to establish allowable values. Yet, cyclic and dynamic forces imparted on buildings
and structures by seismic activity cause more damage than equivalent forces that are applied in a
monotonic manner. However, the engineering, regulatory and manufacturing industries have not reached
consensus on the appropriate cyclic or dynamic testing protocols. This condition is expected to continue
for some time. In the interim, this proposed amendment continues to limit the allowable capacity to 75%
of the evaluation report value to provide an additional factor of safety for statically tested anchorage
devices. Steel plate washers will reduce the additional damage that can result when hold-down
connectors are fastened to wood framing members. This amendment reflects the recommendations by
the Structural Engineers Association of Southern California (SEAOSC) and the Los Angeles City Joint
Task Force that investigated the poor performance observed in 1994 Northridge Earthquake. This
proposed amendment is a continuation of an amendment adopted during previous code adoption cycles
with additional editorial revisions for clarification.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to establish minimum performance requirements for hold-down connectors will reduce failure
of wood structural panel shear walls due to excessive deflection and therefore need to be incorporated
into the code to assure that new buildings and structures and additions or alterations to existing buildings
or structures are designed and constructed in accordance with the scope and objectives of the California
Building Code.
2016 Edition of the California Building Code Page 43 of 118
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 23-05. Section 2306.2 of the 2016 Edition of the California Building Code is amended to
read as follows:
2306.2 Wood -frame diaphragms. Wood -frame diaphragms shall be designed and constructed in
accordance with AWC SDPWS. Where panels are fastened to framing members with staples,
requirements and limitations of AWC SDPWS shall be met and the allowable shear values set forth in
Table 2306.2(1) or 2306.2(2) shall only be permitted for structures assigned to Seismic Design Category
A, B, or C.
Exception: Allowable shear values where panels are fastened to framing members with staples may
be used if such values are substantiated by cyclic testing and approved by the building official.
The allowable shear values in Tables 2306.2(1) and 2306.2(2) are permitted to be increased 40 percent
for wind design.
Wood structural panel diaphragms used to resist seismic forces in structures assigned to Seismic Design
Category D, E or F shall be applied directly to the framing members.
Exception: Wood structural panel diaphragms are permitted to be fastened over solid lumber
planking or laminated decking, provided the panel joints and lumber planking or laminated decking
ioints do not coincide.
RATIONALE:
The Structural Engineers Association of Southern California (SEAOSC) and the Los Angeles City Joint
Task Force that investigated the damages to buildings and structures during the 1994 Northridge
Earthquake recommended reducing allowable shear values in wood structural panel shear walls or
diaphragms that were not substantiated by cyclic testing. That recommendation was consistent with a
report to the Governor from the Seismic Safety Commission of the State of California recommending that
code requirements be "more thoroughly substantiated with testing." The allowable shear values for wood
structural panel shear walls or diaphragms fastened with staples are based on monotonic testing and
does not take into consideration that earthquake forces load shear wall or diaphragm in a repeating and
fully reversible manner.
In September 2007, limited cyclic testing was conducted by a private engineering firm to determine if
wood structural panels fastened with staples would exhibit the same behavior as the wood structural
panels fastened with common nails. The test result revealed that wood structural panel fastened with
staples appeared to be much lower in strength and stiffness than wood structural panels fastened with
common nails. It was recommended that the use of staples as fasteners for wood structural panel shear
walls or diaphragms not be permitted to resist seismic forces in structures assigned to Seismic Design
Category D, E and F unless it can be substantiated by cyclic testing.
Furthermore, the cities and county within the Los Angeles region has taken extra measures to maintain
the structural integrity of the framing of shear walls and diaphragms designed for high levels of seismic
forces by requiring wood sheathing be applied directly over the framing members and prohibiting the use
of panels placed over gypsum sheathing. This proposed amendment is intended to prevent the
undesirable performance of nails when gypsum board softens due to cyclic earthquake displacements
and the nail ultimately does not have any engagement in a solid material within the thickness of the
gypsum board.
This proposed amendment continues the previous amendment adopted during the 2010 code adoption
cycle.
FINDINGS:
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Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to place design and construction limits on staples as fasteners used in wood structural panel
or diaphragms not substantiated with cyclic testing will help to maintain minimum quality of construction
and performance standards of structures and therefore need to be incorporated into the code to assure
that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Building Code.
2016 Edition of the California Building Code Page 45 of 118
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2016 LARUCP 23-06. Section 2306.3 of the 2016 Edition of the California Building Code is amended to
read as follows:
2306.3 Wood -frame shear walls. Wood -frame shear walls shall be designed and constructed in
accordance with AWC SDPWS. For structures assigned to Seismic Design Category D, E, or F,
application of Tables 4.3A and 4.3B of AWC SDPWS shall include the following:
1. Wood structural panel thickness for shear walls shall not be less than 3/8 inch thick and studs
shall not be spaced at more than 16 inches on center.
2. The maximum nominal unit shear capacities for 3/8 inch wood structural panels resisting seismic
forces in structures assigned to Seismic Design Category D, E or F is 400 pounds per linear foot
(101f)_
Exception: Other nominal unit shear capacities may be permitted if such values are
substantiated by cyclic testing and approved by the building official.
3. Nails shall be placed not less than 1/2 inch in from the panel edges and not less than 3/8 inch
from the edge of the connecting members for shear greater than 350 Of using ASD or 500 Of
using LRFD. Nails shall be placed not less than 3/8 inch from panel edges and not less than 1/4
inch from the edge of the connecting members for shears of 350 Of or less using ASD or 500 Of
or less using LRFD.
4. Table 4.3B application is not allowed for structures assigned to Seismic Design Category D, E, or
F.
For structures assigned to Seismic Design Category D, application of Table 4.3C of AWC SDPWS shall
not be used below the top level in a multi-level building.
Where panels are fastened to framing members with staples, requirements and limitations of AWC
SDPWS shall be met and the allowable shear values set forth in Table 2306.3(1),-2306.3(2) or 2306.3(3)
shall only be permitted for structures assigned to Seismic Design Category A, B. or C.
Exception: Allowable shear values where panels are fastened to framing members with staples may
be used if such values are substantiated by cyclic testing and approved by the building official.
The allowable shear values in Tables 2306.3(1) and 2306.3(2) are permitted to be increased 40 percent
for wind design. Panels complying with ANSI/APA PRP -210 shall be permitted to use design values for
Plywood Siding in the AWC SDPWS.
RATIONALE:
The Structural Engineers Association of Southern California (SEAOSC) and the Los Angeles City Joint
Task Force that investigated the damages to buildings and structures during the 1994 Northridge
Earthquake recommended reducing allowable shear values in wood structural panel shear walls or
diaphragms that were not substantiated by cyclic testing. That recommendation was consistent with a
report to the Governor from the Seismic Safety Commission of the State of California recommending that
code requirements be "more thoroughly substantiated with testing." The allowable shear values for wood
structural panel shear walls or diaphragms fastened with stapled nails are based on monotonic testing
and does not take into consideration that earthquake forces load shear wall or diaphragm in a repeating
and fully reversible manner.
In September 2007, limited cyclic testing was conducted by a private engineering firm to determine if
wood structural panels fastened with stapled nails would exhibit the same behavior as the wood structural
panels fastened with common nails. The test result revealed that wood structural panel fastened with
2016 Edition of the California Building Code Page 46 of 118
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stapled nails appeared to be much lower in strength and stiffness than wood structural panels fastened
with common nails. It was recommended that the use of stapled nail as fasteners for wood structural
panel shear walls or diaphragms not be permitted to resist seismic forces in structures assigned to
Seismic Design Category D, E and F unless it can be substantiated by cyclic testing.
Furthermore, the cities and county within the Los Angeles region has taken extra measures to maintain
the structural integrity of the framing of shear walls and diaphragms designed for high levels of seismic
forces by requiring wood sheathing be applied directly over the framing members and prohibiting the use
of panels placed over gypsum sheathing. This proposed amendment is intended to prevent the
undesirable performance of nails when gypsum board softens due to cyclic earthquake displacements
and the nail ultimately does not have any engagement in a solid material within the thickness of the
gypsum board.
This proposed amendment continues the previous amendment adopted during the 2010 code adoption
cycle.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to place design and construction limits on stapled nail fasteners used in wood structural
panel shear walls or diaphragms not substantiated with cyclic testing will help to maintain minimum quality
of construction and performance standards of structures and therefore need to be incorporated into the
code to assure that new buildings and structures and additions or alterations to existing buildings or
structures are designed and constructed in accordance with the scope and objectives of the California
Building Code.
2016 Edition of the California Building Code Page 47 of 118
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2016 LARUCP 23-07. Section 2307.2 is added to the 2016 Edition of the California Building Code to read
as follows:
2307.2 Wood -frame shear walls. Wood -frame shear walls shall be designed and constructed in
accordance with Section 2306.3 as applicable.
RATIONALE:
The Structural Engineers Association of Southern California (SEAOSC) and the Los Angeles City Joint
Task Force that investigated the damages to buildings and structures during the 1994 Northridge
Earthquake recommended reducing allowable shear values in wood structural panel shear walls or
diaphragms that were not substantiated by cyclic testing. That recommendation was consistent with a
report to the Governor from the Seismic Safety Commission of the State of California recommending that
code requirements be "more thoroughly substantiated with testing." The allowable shear values for wood
structural panel shear walls or diaphragms fastened with stapled nails are based on monotonic testing
and does not take into consideration that earthquake forces load shear wall or diaphragm in a repeating
and fully reversible manner.
In September 2007, limited cyclic testing was conducted by a private engineering firm to determine if
wood structural panels fastened with stapled nails would exhibit the same behavior as the wood structural
panels fastened with common nails. The test result revealed that wood structural panel fastened with
stapled nails appeared to be much lower in strength and stiffness than wood structural panels fastened
with common nails. It was recommended that the use of stapled nail as fasteners for wood structural
panel shear walls or diaphragms not be permitted to resist seismic forces in structures assigned to
Seismic Design Category D, E and F unless it can be substantiated by cyclic testing.
Furthermore, the cities and county within the Los Angeles region has taken extra measures to maintain
the structural integrity of the framing of shear walls and diaphragms designed for high levels of seismic
forces by requiring wood sheathing be applied directly over the framing members and prohibiting the use
of panels placed over gypsum sheathing. This proposed amendment is intended to prevent the
undesirable performance of nails when gypsum board softens due to cyclic earthquake displacements
and the nail ultimately does not have any engagement in a solid material within the thickness of the
gypsum board.
This proposed amendment continues the previous amendment adopted during the 2010 code adoption
cycle.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to place design and construction limits on stapled nail fasteners used in wood structural
panel shear walls or diaphragms not substantiated with cyclic testing will help to maintain minimum quality
of construction and performance standards of structures and therefore need to be incorporated into the
code to assure that new buildings and structures and additions or alterations to existing buildings or
structures are designed and constructed in accordance with the scope and objectives of the California
Building Code.
2016 Edition of the California Building Code Page 48 of 118
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 23-08. Table 2308.6.1 of the 2016 Edition of the California Building Code is amended to
read as follows:
TABLE 2308.6.1a
WALL BRACING REQUIREMENTS
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
NP = Not Permitted.
a. This table specifies minimum requirements for braced wall panels along interior or exterior braced wall lines.
b. See Section 2308.6.3 for full description of bracing methods.
c. For Method OR, gypsum wallboard applied to framing supports that are spaced at 16 inches on center.
d. The required lengths shall be doubled for gypsum board applied to only one face of a braced wall panel.
e. Percentage shown represents the minimum amount of bracing required along the building length (or wall length if the structure has an irregular shape).
f DWB. SFB. PBS, and HPS wall braces are not permitted in Seismic Design Catergories D or E.
g Minimum length of panel bracing of one face of the wall for WSP sheathing shall be at least 4'-0" lone or both faces of the wall for GB or PCP sheathingdull
be at least 8'-0" long- h/w ratio shall not exceed 2 1 Wall framing to which sheathing used for bracing is applied shall be nominal 2 inch wide factual 1 I/2 inch
(38 mm) or lamer members and spaced a maximum of 16 inches on center. Braced wall panel construction types shall not be mixed within a bracedwall line.
h. WSP sheathing shall be a minimum of 15/32" thick nailed with 8d common placed 3/8 inches from panel edges and spaced not more than 6 inches on center and
12 inches on center along intermediate framing members.
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MAXIMUM
BRACED PANEL LOCATION,
MAXIMUM DISTANCE
SEISMIC
STORY
SPACING OF
SPACING (D.C.) AND MINIMUM PERCENTAGE (X)
OF BRACED WALL
DESIGN
CONDITION (SEE
BRACED
PANELS FROM EACH
CATEGORY
SECTION 2308.2)
WALL LINES
END OF BRACED
WALL LINE
Bracingmethod°
LIB
DWB, WSP
SFB, PBS, PCP, HPS, GB`•tl
8
35'- 0,
Each end and
5 25'- 0" o.c.
Each end and 5 25'- 0" o.c.
Each end and:5 25'- 0" o.c.
12'- 6"
A and B
350"
Each end and'-
Each end and:5 25'- d' o.c.
Each end and < 25'- 0" o.c.
12'- 6"
e
5 25'- 0" o.c.
35'- 0"
NP
Each end and:5 25'- 0" o.c.
Each end and 5 25'- 0" o.c.
12'- 6"
e35'-
0"
NP
Each end and:5 25'- 0" o.c.
Each end and < 25'- 0" o.c.
12'- 6"
C
Each end and_,, 25'- 0" o.c.
Each end and_,, 25'- 0" o.c.
e
35'- 0"
NP
(minimum 25% of wall
(minimum 25% of wall
12'- 6"
length)`
length)`
SDS < 0.50: Each end and <
SDS < 0.50: Each cod and:5
25'- 0" o.c. (minimum 21%
25'- 0" o.c. (minimum 43%
of wall length)`
of wall length)`
0.5 5 SDS < 0.75: Each end
0.5 <SDS < 0.75: Each end
and:5 25'- 0" o.c. (mini-
and <25'- 0" o.c. (minimum
ren
mum 32% of wall length)`
59% of wall length)`
D and E
25'- 0"
NP
81- 0"
0.75 <S,,s:5 1.00: Each end
0.75 < SDs 51.00: Each end
and525'-0"o.c.(mini-
and 5 25'- To. c. (minimum
mum 37% of wall length)`
75% of wall length)
SDs > 1.00: Each end and <
SDS > 1.00: Each end and:5
25'- T o.c. (minimum48%
25'- 0" o.c. (minimum
of wall length)`
100% of wall length)`
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
NP = Not Permitted.
a. This table specifies minimum requirements for braced wall panels along interior or exterior braced wall lines.
b. See Section 2308.6.3 for full description of bracing methods.
c. For Method OR, gypsum wallboard applied to framing supports that are spaced at 16 inches on center.
d. The required lengths shall be doubled for gypsum board applied to only one face of a braced wall panel.
e. Percentage shown represents the minimum amount of bracing required along the building length (or wall length if the structure has an irregular shape).
f DWB. SFB. PBS, and HPS wall braces are not permitted in Seismic Design Catergories D or E.
g Minimum length of panel bracing of one face of the wall for WSP sheathing shall be at least 4'-0" lone or both faces of the wall for GB or PCP sheathingdull
be at least 8'-0" long- h/w ratio shall not exceed 2 1 Wall framing to which sheathing used for bracing is applied shall be nominal 2 inch wide factual 1 I/2 inch
(38 mm) or lamer members and spaced a maximum of 16 inches on center. Braced wall panel construction types shall not be mixed within a bracedwall line.
h. WSP sheathing shall be a minimum of 15/32" thick nailed with 8d common placed 3/8 inches from panel edges and spaced not more than 6 inches on center and
12 inches on center along intermediate framing members.
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RATIONALE:
This proposed amendment specifies minimum sheathing thickness and nail size and spacing so as to
provide a uniform standard of construction for designers and buildings to follow. This is intended to
improve the performance level of buildings and structures that are subject to the higher seismic demands
placed on buildings or structure in this region. This proposed amendment reflects the recommendations
by the Structural Engineers Association of Southern California (SEAOSC) and the Los Angeles City Joint
Task Force that investigated the poor performance observed in 1994 Northridge Earthquake. This
proposed amendment is a continuation of an amendment adopted during previous code adoption cycles.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. Conventional
framing does not address the need for a continuous load path, critical shear transfer mechanisms,
connection -ties, irregular and flexible portions of complex shaped structures. The proposed modification
to provide specific detailing requirements will improve the performance of buildings and structures and
therefore needs to be incorporated into the code to assure that new buildings and additions to existing
buildings are designed and constructed in accordance with the scope and objectives of the California
Building Code.
2016 Edition of the California Building Code Page 50 of 118
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 23-09. Section 2308.6.5, Figure 2308.6.5.1, and Figure 2308.6.5.2 of the 2016 Edition of
the California Building Code are amended to read as follows:
2308.6.5 Alternative bracing. An alternate braced wall (ABW) or a portal frame with hold-downs (PFH)
described in this section is permitted to substitute for a 48 -inch (1219 mm) braced wall panel of Method
DWB, WSP, SFB, PBS, PCP or HPS. For Method GB, each 96 -inch (2438 mm) section (applied to one
face) or 48 -inch (1219 mm) section (applied to both faces) or portion thereof required by Table 2308.6.1
is permitted to be replaced by one panel constructed in accordance with Method ABW or PFH.
2308.6.5.1 Alternate braced wall (ABW). An ABW shall be constructed in accordance with this
section and Figure 2308.6.5.1. In one-story buildings, each panel shall have a length of not less than
2 feet 8 inches (813 mm) and a height of not more than 10 feet (3048 mm). Each panel shall be
sheathed on one face with 3/8 -inch (3.2 mm) minimum -thickness wood structural panel sheathing
nailed with 8d common or galvanized box nails in accordance with Table 2304.10.1 and blocked at
wood structural panel edges. For structures assigned to Seismic Design Category D or E, each panel
shall be sheathed on one face with 15/32 -inch -minimum -thickness (11.9 mm) wood structural panel
sheathing nailed with 8d common nails spaced 3 inches on panel edges, 3 inches at intermediate
supports. Two anchor bolts installed in accordance with Section 2308.3.1 shall be provided in each
panel. Anchor bolts shall be placed at each panel outside quarter points. Each panel end stud shall
have a hold-down device fastened to the foundation, capable of providing an approved uplift capacity
of not less than 1,800 pounds (8006 N). The hold-down device shall be installed in accordance with
the manufacturer's recommendations. The ABW shall be supported directly on a foundation or on
floor framing supported directly on a foundation that is continuous across the entire length of the
braced wall line. This foundation shall be reinforced with not less than one No. 4 bar top and bottom.
Where the continuous foundation is required to have a depth greater than 12 inches (305 mm), a
minimum 12 -inch by 12 -inch (305 mm by 305 mm) continuous footing GF tume.+-deWR Slab edge is
permitted at door openings in the braced wall line. This continuous footing of tur.,ea_d,,WR Bloc, edge
shall be reinforced with not less than one No. 4 bar top and bottom. This reinforcement shall be
lapped -1-5 24 inches (391- 610 mm) with the reinforcement required in the continuous foundation
located directly under the braced wall line.
Where the ABW is installed at the first story of two-story buildings, the wood structural panel
sheathing shall be provided on both faces, three anchor bolts shall be placed at one-quarter points
and tie -down device uplift capacity shall be not less than 3,000 pounds (13 344 N).
F– MIN. '/8" THICK WOOD a
= STRUCTURALPANEL
w SHEATHING ON ONE FACE—
MIN. 2x4 FRAMING. MIN. DOU
g STUDS REQUIRED
0
o STUDS UNDER HEADER AS
REQUIRED
HOLD-DOWN PER SECTION -
2308,6.5.1
L
2`-8" MIN PANEL FOR PANEL SPLICE (IF NEEDED) ADJOINING PANEL
LENGTH EDGES SHALL MEET OVER AND BE FASTENED TO
COMMON FRAMING
8d COMON ^" GA """"'6^ S^" NAILS AT 6" O.C.
AT PANEL EDGES FOR SINGLE STORYAND AT4" O.C.
AT PANEL EDGES FOR THE FIRST OF 2 STORIES
BOLTS PER SECTION 2308.6.5.1
MINIMUM REINFORCING OF FOUNDATION, ONE 44
BAR TOP AND BOTTOM OF FOOTING. REINFORCING
SHALL BE LAPPED 49 24 INCHES MIN.
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
a. For structures assigned to Seismic Design CatBoorV D or E. sheathed on one face with 15/32mch-minimum-thickness f11.9 mm) wood structural panel sheathing,
FIGURE 2308.6.5.1
ALTERNATE BRACED WALL PANEL (ABW)
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2308.6.5.2 Portal frame with hold-downs (PFH). A PFH shall be constructed in accordance with
this section and Figure 2308.6.5.2. The adjacent door or window opening shall have a full-length
header.
In one-story buildings, each panel shall have a length of not less than 16 inches (406 mm) and a
height of not more than 10 feet (3048 mm). Each panel shall be sheathed on one face with a single
layer of 3/8 -inch (9.5 mm) minimum -thickness wood structural panel sheathing nailed with 8d
common or galvanized box nails in accordance with Figure 2308.6.5.2. For structures assigned to
Seismic Design Category D or E, each panel shall be sheathed on one face with 15/32 -inch -
minimum -thickness N 1.9 mm) wood structural panel sheathing nailed with 8d common nails spaced 3
inches on panel edges, 3 inches at intermediate supports and in accordance with Figure 2308.6.5.2.
The wood structural panel sheathing shall extend up over the solid sawn or glued -laminated header
and shall be nailed in accordance with Figure 2308.6.5.2. A built-up header consisting of at least two
2 -inch by 12 -inch (51 mm by 305 mm) boards, fastened in accordance with Item 24 of Table
2304.10.1 shall be permitted to be used. A spacer, if used, shall be placed on the side of the built-up
beam opposite the wood structural panel sheathing. The header shall extend between the inside
faces of the first full-length outer studs of each panel. The clear span of the header between the inner
studs of each panel shall be not less than 6 feet (1829 mm) and not more than 18 feet (5486 mm) in
length. A strap with an uplift capacity of not less than 1,000 pounds (4,400 N) shall fasten the header
to the inner studs opposite the sheathing. One anchor bolt not less than 5/8 inch (15.9 mm) diameter
and installed in accordance with Section 2308.3.1 shall be provided in the center of each sill plate.
The studs at each end of the panel shall have a hold-down device fastened to the foundation with an
uplift capacity of not less than 3,500 pounds (15 570 N).
Where a panel is located on one side of the opening, the header shall extend between the inside face
of the first full-length stud of the panel and the bearing studs at the other end of the opening. A strap
with an uplift capacity of not less than 1,000 pounds (4400 N) shall fasten the header to the bearing
studs. The bearing studs shall also have a hold-down device fastened to the foundation with an uplift
capacity of not less than 1,000 pounds (4400 N). The hold-down devices shall be an embedded strap
type, installed in accordance with the manufacturer's recommendations. The PFH panels shall be
supported directly on a foundation that is continuous across the entire length of the braced wall line.
This foundation shall be reinforced with not less than one No. 4 bar top and bottom. Where the
continuous foundation is required to have a depth greater than 12 inches (305 mm), a minimum 12 -
inch by 12 -inch (305 mm by 305 mm) continuous footing ^F tumea-down slab edge is permitted at
door openings in the braced wall line. This continuous footing OF
tuMea-dGWR slab edge shall be
reinforced with not less than one No. 4 bar top and bottom. This reinforcement shall be lapped not
less than 45 24 inches (384- 610 mm) with the reinforcement required in the continuous foundation
located directly under the braced wall line.
Where a PFH is installed at the first story of two-story buildings, each panel shall have a length of not
less than 24 inches (610 mm).
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EXTENT OF HEADER
DOUBLE PORTAL FRAME (TWO BRACED WALL PANELS)
EXTENT OF HEADER
SINGLE PORTAL FRAME (ONE BRACED WALL PANEL) 7 MIN. 1000 LB TIE -DOWN
DEVICE
MIN. 3"x11.25" NET HEADER 1'
6' TO 18' TYPICAL PORTAL FRAME
CONSTRUCTION
-10001b STRAP OPPOSITE SHEATHING
- FASTEN TOP PLATE TO HEADER WITH TWO
FOR PANEL SPLICE (IF
ROWS OF 16d SINKER NAILS AT 3" O.C. TYR
NEEDED)) PANEL EDGES
SHALL BE BLOCKED AND
-FASTEN SHEATHING TO HEADER WITH 8d COMMON
OCCUR WITHIN MIDDLE
OR GALVANIZED BOX NAILS IN 3" GRID PATTERN AS
24 IN. OF PORTAL HEIGHT.
SHOWN AND 3" O.C. IN ALL FRAMING (STUDS,
ONE ROW OF TYPICAL
BLOCKING AND SILLS) TYR
SHEATHING -TO -FRAMING
-MIN. WIDTH = 16" FOR ONE-STORY STRUCTURES
NAILING IS REQUIRED
MIN. WIDTH = 24" FOR USE IN FIRST OF TWO STCR1e
AT EACH PANEL EDGE.
STRUCTURES
IF 2x4 DOUBLE BLOCKING
IS USED THE 2x4S MUST
BE NAILED TOGETHER
-MIN. 2x4 FRAMING
WITH (3)1 fid SINKERS
-31e MIN. THICKNESS WOOD a
STRUCTURAL PANEL SHEATHING
.—MIN. DOUBLE 2x4 POST
-MIN. 3500 LBTIE-DOWN DEVICE (EMBEDDED INTO
CONCRETEAND NAILED INTO FRAMING IN
N11N. 1000 LB TIE -DOWN
ACCORDANCE WITH MANUFACTURER'S
DEVICE
RECOMMENDATIONS)
SEE SECTION 2308.6.5.2—
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound = 4.448 N.
a. For structures assigaed to Seismic Design Category D or E, sheathed on one face with 15/32 -inch -minimum -thickness (11.9 mm) wood structural panel sheathing.
FIGURE 2308.6.5.2
PORTAL FRAME WITH HOLD-DOWNS (PFH)
RATIONALE:
3/8" thick, 3 ply -plywood shear walls experienced many failures during the Northridge Earthquake. Box
nails were observed to cause massive and multiple failures of the typical 3/8" thick 3 -ply plywood during
the Northridge Earthquake. This proposed amendment specifies minimum sheathing thickness, nail size
and spacing so as to provide a uniform standard of construction for designers and buildings to follow. This
is intended to improve the performance level of buildings and structures that are subject to the higher
seismic demands and reduce and limit potential damages to property. This proposed amendment reflects
the recommendations by the Structural Engineers Association of Southern California (SEAOSC) and the
Los Angeles City Joint Task Force that investigated the poor performance observed in 1994 Northridge
Earthquake.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification requiring minimum sheathing thickness and nailing type and size will help to maintain
minimum quality of construction and performance standards of structures and therefore needs to be
incorporated into the code to assure that new buildings and additions to existing buildings are designed
and constructed in accordance with the scope and objectives of the California Building Code.
2016 Edition of the California Building Code Page 53 of 118
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2016 LARUCP 23-10. Section 2308.6.8.1 of Chapter 23 of the 2016 Edition of the California Building
Code is amended to read as follows:
2308.6.8.1 Foundation requirements. Braced wall lines shall be supported by continuous foundations.
Exception: For structures with a maximum plan dimension not more than 50 feet (15240 mm),
continuous foundations are required at exterior walls only for structures assigned to Seismic Design
Category A. B. or C.
For structures in Seismic Design Categories D and E, exterior braced wall panels shall be in the same
plane vertically with the foundation or the portion of the structure containing the offset shall be designed in
accordance with accepted engineering practice and Section 2308.1.1.
RATIONALE:
With the higher seismic demand placed on buildings and structures in this region, interior walls can easily
be called upon to resist over half of the seismic loading imposed on simple buildings or structures.
Without a continuous foundation to support the braced wall line, seismic loads would be transferred
through other elements such as non-structural concrete slab floors, wood floors, etc. The proposed
change is to limit the use of the exception to structures assigned to Seismic Design Category A, B or C
where lower seismic demands are expected. Requiring interior braced walls be supported by continuous
foundations is intended to reduce or eliminate the poor performance of buildings or structures. This
proposed amendment is a continuation of an amendment adopted during previous code adoption cycles.
2016 Edition of the California Building Code Page 54 of 118
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FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. Conventional
framing does not address the need for a continuous load path, critical shear transfer mechanisms,
connection -ties, irregular and flexible portions of complex shaped structures. The proposed modification
to require continuous footings under braced wall lines will improve performance of buildings or structure
during a seismic event and therefore need to be incorporated into the code to assure that new buildings
and additions to existing buildings are designed and constructed in accordance with the scope and
objectives of the California Building Code.
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2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 23-11. Section 2308.6.9 of the 2016 Edition of the California Building Code is amended to
read as follows:
2308.6.9 Attachment of sheathing. Fastening of braced wall panel sheathing shall not be less than that
prescribed in Tables 2308.6.1 or 2304.10.1. Wall sheathing shall not be attached to framing members by
adhesives. Staple fasteners in Table 2304.10.1 shall not be used to resist or transfer seismic forces in
structures assigned to Seismic Design Category D. E or F.
Exception: Staples may be used to resist or transfer seismic forces when the allowable shear values
are substantiated by cyclic testing and approved by the building official.
All braced wall panels shall extend to the roof sheathing and shall be attached to parallel roof rafters
or blocking above with framing clips (18 gauge minimum) spaced at maximum 24 inches (6096 mm) on
center with four 8d nails per leg (total eight 8d nails per clip). Braced wall panels shall be laterally braced
at each top corner and at maximum 24 inches (6096 mm) intervals along the top plate of discontinuous
vertical framing.
RATIONALE:
This proposed amendment is intended to improve the performance level of buildings and structures that
are subject to the higher seismic demands placed on buildings or structure in this region. This proposed
amendment reflects the recommendations by the Structural Engineers Association of Southern California
(SEAOSC) and the Los Angeles City Joint Task Force that investigated the poor performance observed in
1994 Northridge Earthquake. This proposed amendment is a continuation of an amendment adopted
during previous code adoption cycles.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. Conventional
framing does not address the need for a continuous load path, critical shear transfer mechanisms,
connection -ties, irregular and flexible portions of complex shaped structures. The proposed modification
to provide specific detailing requirements will improve the performance of buildings and structures and
therefore needs to be incorporated into the code to assure that new buildings and additions to existing
buildings are designed and constructed in accordance with the scope and objectives of the California
Building Code.
2016 Edition of the California Building Code Page 56 of 118
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
PART 11
LARUCP RECOMMENDED CODE AMENDMENTS TO THE
2016 EDITION OF THE CALIFORNIA RESIDENTIAL CODE
2016 Edition of the California Building Code Page 58 of 118
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
SUMMARY OF RECOMMENDED LARUCP AMENDMENTS TO THE 2016 CRC
(N) 2016
LARUCP
NO.
(E) 2013
LARUCP
NO.
TITLE/DESCRIPTION
STATUS
R3-01
R3-01
Amend CRC Section R301.1.3.2 Woodframe Structures
R
R3-02
R3-02
Add CRC Section R301.1.4 Slopes Steeper Than 33%
R
82-02
n;eRd ror Table 391 .2.2.1.1 and SeGtiOR oan1 2 2 1 2 SeisrniG
D
R3-03
R3-04
Amend CRC Section R301.2.2.2.5 Irregular Buildings
R
R3-04
R3-05
Add CRC Section R301.2.2.3.8 Anchorage of Equipment
R
R4-01
R4-01
Amend CRC Section R401.1 Foundation Application
M
R4-02
R4-02
Amend CRC Sections R403.1 General Footings
M
R4-03
R4-03
Amend CRC Section R404.2 Wood Foundation Walls
R
R5-01
R5-01
Amend CRC Section R501.1 Application
R
R5-02
R5-02
Add CRC Section R503.2.4 Openings In Horizontal Diaphragms
R
R6-01
R6-01
Amend CRC Table R602.3(1) Fastener Schedule
M
R6-02
R6-02
Amend CRC Table R602.3(2) Alternate Attachment
R
R6-03
R6-03
Amend CRC Table R602.10.3(3) Bracing Requirements
M
R6-04
R6-04
Amend CRC Table R602.10.4 Bracing Methods
M
R6-05
R6-05
Amend CRC Figure R602.10.6.1 Alternate Braced Wall Panel
R
R6-06
R6-06
Amend CRC Figure R602.10.6.2 Portal Frame
M
R6-07
R6-07
Amend CRC Table R602.10.5 Braced Wall Lengths
M
R6-08
R6-08
Amend CRC Section R602.10.2.3 Minimum Number of Braced Wall
Panels
R
R6-09
R6-09
Amend CRC Figure R602.10.6.4 Method CS -PF
R
RR -10
[DeleteAmeRdFneRt f„F GRGSeGtiGR R602.19x.9.19;-Eed'nf�apel
SWPGFt
D
R6-10
R6-11
Amend CRC Section R606.4.4 Parapet Walls
M
R6-11
R6-12
I Amend CRC Section R606.12.2.2.3 Reinforcement for Masonry
R
R6-12
R6-13
Amend CRC Section R602.3.2 Top Plate
M
R8-01
R8-01
Add CRC Section R803.2.4 Openings in Horizontal Diaphragms
R
R10-01
R10-01
Amend CRC Section R1001.3.1 Vertical Reinforcing
R
FOOTNOTE:
1. R = Retain and update existing amendment, M = Modify existing amendment, D = Delete existing 2013 LARUCP amendment,
N = New amendment proposed.
2016 Edition of the California Building Code Page 59 of 118
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP R3-01. Section R301.1.3.2 of the 2016 Edition of the California Residential Code is
amended to read as follows:
R301.1.3.2 Woodframe structures ^Feat°. thaR tWO-ctOlFie . The building official shall require
construction documents to be approved and stamped by a California licensed architect or engineer for all
dwellings of woodframe construction more than two stories and basement in height located in Seismic
Design Category A, B or C. Notwithstanding other sections of law; the law establishing these provisions is
found in Business and Professions Code Section 5537 and 6737.1.
The building official shall require construction documents to be approved and stamped by a California
licensed architect or engineer for all dwellings of woodframe construction more than one story in height or
with a basement located in Seismic Design Category Do, D1Dz or E.
RATIONALE:
After the 1994 Northridge Earthquake, the Wood Frame Construction Joint Task Force recommended
that the quality of wood frame construction need to be greatly improved. One such recommendation
identified by the Task Force is to improve the quality and organization of structural plans prepared by the
engineer or architect so that plan examiners, building inspectors, contractors and special inspectors may
logically follow and construct the presentation of the seismic force -resisting systems in the construction
documents. For buildings or structures located in Seismic Design Category Do, D1, DZ or E that are
subject to a greater level of seismic forces, the requirement to have a California licensed architect or
engineer prepare the construction documents is intended to minimize or reduce structural deficiencies
that may cause excessive damage or injuries in wood frame buildings. Structural deficiencies such as
plan and vertical irregularities, improper shear transfer of the seismic force -resisting system, missed
details or connections important to the structural system, and the improper application of the prescriptive
requirements of the California Residential Code can be readily addressed by a registered design
professional.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to require construction documents for wood frame construction greater than one story in
height or with a basement to be approved and stamped by a California licensed architect or engineer is
intended to assure that both the structural design and prescriptive requirement of the code are properly
utilized and presented and therefore need to be incorporated into the code to assure that new buildings
and structures, and additions or alterations to existing buildings or structures are designed and
constructed in accordance with the scope and objectives of the California Residential Code.
2016 Edition of the California Building Code Page 60 of 118
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP R3-02. Section R301.1.4 is added to Chapter 3 of the 2016 Edition of the California
Residential Code to read as follows:
R301.1.4 Seismic design provisions for buildings constructed on or into slopes steeper than one
unit vertical in three units horizontal (33.3 percent slope). The design and construction of new
buildings and additions to existing buildings when constructed on or into slopes steeper than one unit
vertical in three units horizontal (33.3 percent slope) shall comply with Section 1613.9 of the Building
Code.
RATIONALE:
Due to the difficulty of fire suppression vehicles accessing winding and narrow hillside properties and the
probabilities for future earthquakes in the Los Angeles region, this technical amendment is required to
address the special needs for buildings constructed on hillside locations. A joint Structural Engineers
Association of Southern California (SEAOSC) and both the Los Angeles County and Los Angeles City
Task Force investigated the performance of hillside building failures after the Northridge earthquake.
Numerous hillside failures resulted in loss of life and millions of dollars in damage. These criteria were
developed to minimize the damage to these structures and have been in use by both the City and County
of Los Angeles for several years with much success. This proposed amendment is a continuation of an
amendment adopted during previous code adoption cycles.
FINDINGS:
Local Topographical and Geological Conditions — The greater Los Angeles region is a densely populated
area having buildings and structures constructed over and near a vast array of fault systems capable of
producing major earthquakes, including but not limited to the recent 1994 Northridge Earthquake.
Additionally, the topography within the Los Angeles region includes significant hillsides with narrow and
winding access that makes timely response by fire suppression vehicles challenging and difficult. The
proposed modification establishes design parameters to better mitigate and limit property damage that
are the results of increased seismic forces which are imparted upon hillside buildings and structures and
therefore need to be incorporated into the code to assure that new buildings and structures and additions
or alterations to existing buildings or structures are designed and constructed in accordance with the
scope and objectives of the California Residential Code.
2016 Edition of the California Building Code Page 61 of 118
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 113-03. Items 1, 3 and 5 of Section R301.2.2.2.5 of the 2016 Edition of the California
Residential Code are amended to read as follows:
1. Where exterior shear wall lines or braced wall panels are not in one plane vertically from the
foundation to the uppermost story in which they are required.
fewF tomes th af the weed fleeF joists aFe pemnitted te SUPPGFt bFaGed wall paRels
that a eut of plane with hroged wall panels helew prev.ded that;
1 CIGGF 4a al 2 hes by 1 /1 innhec /5.1 mm by 254 mm) nr larger and Spa^ed
nn+ MOR thap 149 innhec /A 06 mm\ OR enter
7 The ratio of the haek spap to the antileyer is nn+ less than 2 to 1
g CIeeF jemsts at epds of hraged wall Pe els a e dog bled-
4m rC-o d f ame + t' ptipFiFR ,in iS4 i eg+ed to end^ of ran+ile„er
joists. When pliged then using m foists shall be spliged a nalyani-zed metal tie not less
tha 9.959 ORGh (1.5 mm\ /16 gage) apd 1 1 2 innhec. /'2A mm\ .nude fastened w0th six 16d
y��'I e h 'd f Sp"Ge a hlnnL of the4h 4 f ffden4
A;-; .-T'prr-PRGh-FAA Of �vi�orcc�o-n-re r��ii�oioc o� ooh Adept
1 th to f} 1 h t. R the joist + ...hih the oline n c fastened with
e
s naga at nrr� �r
eight 16d nails n ear --h Side of the cnli^e• and
5. Gravity lead- _ar '_d a4 the d of gantileyered inicts are limited to Unifnrm wall and roof
leads and the _ _a 4 from headers hayipg a -_. of 9 feet /2434 mm\ nr less,
3. When the end of a braced wall panel occurs over an opening in the wall below and epds at
h i tal d' to or ater than 1 font (395 mm) from the edge of the openins This p n iS
r,vn � rny�S�n
of plane a permitted by the exgeptinn 4n item 1
EiFvepti9n. C weed light fame __-II _on6tF6lGtinn ____ end of a hroged wall panel _shall he
peFFnitted t v4 d +ha font (306 m) oGpeRiRg n} mere than A_fee+ (243 2
MFn) OR width iR the wall below pFGvided that the GpeRiRg iRGludes a header OR aGGerdaRGe with
the fel'GWi' g:
iThe Id' width, loading nditiQ-B nd frR-.rA*Rg ember speGies limitations of Table
R602 7/1\ shall apply and
2. Not I___ th`.. _.._ 2x137 or two 7x19 For an opening not m e than d feet (1219 mm) wide; r,
3. Nn} less than two 2x! 2 ep three 7„1 n f_r an opening not more than 6 feet /1829 mm) in width;
Gr
4 Not less tha +h ee 2x17 nr fe6 jr 37x1 n for an epening pot mere than Q feet (243 2 mm) in
width; and
5. The a tiFe Ie +h f the hraaed _.3_II panel does gat ^_g61r oyer _n peni n n the .all helew.
5. Where portions of a floor level are vertically offset.
ExGeptiens
4. C Rg pported dir_gtly by G94%8616 foundations at the perimeter of the building
2016 Edition of the California Building Code Page 62 of 118
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RATIONALE:
With the higher seismic demand placed on buildings and structures in this region, precautionary steps are
proposed to reduce or eliminate potential problems that may result by limiting the type of irregular
conditions specified in the California Residential Code. Such limitations are intended to reduce the
potential structural damage expected in the event of an earthquake. The cities and county of the Los
Angeles region has taken extra measures to maintain the structural integrity of the framing of the shear
walls and all associated elements when designed for high levels of seismic loads.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
amendment limits the type of irregular conditions within buildings that may lead to higher structural
damage during a seismic event and therefore needs to be incorporated into the code to assure that new
buildings and structures and additions or alterations to existing buildings or structures are designed and
constructed in accordance with the scope and objectives of the California Residential Code and
consistent with the requirements in the ASCE 7-10.
2016 Edition of the California Building Code Page 63 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 113-04. Section R301.2.2.3.8 is added to Chapter 3 of the 2016 Edition of the California
Residential Code to read as follows:
R301.2.2.3.8 Anchorage of Mechanical, Electrical, or Plumbing Components and Equipment.
Mechanical, electrical, or plumbing components and equipment shall be anchored to the structure.
Anchorage of the components and equipment shall be designed to resist loads in accordance with the
California Building Code and ASCE 7, except where the component is positively attached to the structure
and flexible connections are provided between the component and associated ductwork, piping, and
conduit: and either
1. The component weighs 400 Ib (1,780 N) or less and has a center of mass located 4 ft (1.22 m) or
less above the supporting structure: or
2. The component weighs 20 Ib (89N) or less or, in the case of a distributed system, 5 Ib/ft (73 N/m)
or less.
RATIONALE:
There is no limitation for weight of mechanical and plumbing fixtures and equipment in the California
Residential Code. Requirements from ASCE 7 and the California Building Code would permit equipment
weighing up to 400 lbs. when mounted at 4 feet or less above the floor or attic level without engineering
design. Where equipment exceeds this requirement, it is the intent of this proposed amendment that a
registered design professional be required to analyze if the floor support is adequate and structurally
sound.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to limit the equipment weight is intended to reduce injuries, save lives, and minimize
structural damages and therefore needs to be incorporated into the code to assure that new buildings and
structures and additions or alterations to existing buildings or structures are designed and constructed in
accordance with the scope and objectives of the California Residential Code.
2016 Edition of the California Building Code Page 64 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP R4-01. Section R401.1 of the 2016 Edition of the California Residential Code is amended
to read as follows:
R401.1 Application. The provisions of this chapter shall control the design and construction of the
foundation and foundation spaces for buildings. In addition to the provisions of this chapter, the design
and construction of foundations in flood hazard areas as established by Table R301.2(1) shall meet the
provisions of Section R322. Wood foundations shall be designed and installed in accordance with AWC
PWF.
Exception: The provisions of this chapter shall be permitted to be used for wood foundations only in
the following situations:
1. In buildings that have no more than two floors and a roof.
2. When interior basement and foundation walls are constructed at intervals not exceeding 50
feet (15 240 mm).
Wood foundations in Seismic Design Category Da, D, or DZ shall be designed OR aGreF ante with
^tem' eRgiReeriR9 pFaGt!Ge-not be permitted.
Exception: In non -occupied, single -story, detached storage sheds and similar uses other than
carport or garage, provided the gross floor area does not exceed 200 square feet, the plate height
does not exceed 12 feet in height above the grade plane at any point, and the maximum roof
prosection does not exceed 24 inches.
RATIONALE:
No substantiating data has been provided to show that wood foundation is effective in supporting
buildings and structures during a seismic event while being subject to deterioration caused by the
combined detrimental effect of constant moisture in the soil and wood -destroying organisms. Wood
foundation, when they are not properly treated and protected against deterioration, have performed very
poorly and have led to slope failures. Most contractors are typically accustomed to construction in dry and
temperate weather in the Southern California region and are not generally familiar with the necessary
precautions and treatment of wood that makes it suitable for both seismic event and wet applications. The
proposed amendment takes the precautionary steps to reduce or eliminate potential problems that may
result in using wood foundation that experience relatively rapid decay due to the fact that the region does
not experience temperatures cold enough to destroy or retard the growth and proliferation of wood -
destroying organisms. However, an exception is made for non -occupied, single -story storage structures
that pose significantly less risk to human safety and may utilize the wood foundation guidelines specified
in this Chapter. This proposed amendment is a continuation of an amendment adopted during previous
code adoption cycles for the California Residential Code.
FINDINGS:
Local Climatic and Geological Conditions — The greater Los Angeles region is a densely populated area
having buildings and structures constructed over and near a vast array of fault systems capable of
producing major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. In
addition, the region is within a climate system capable of producing major winds, fire and rain related
disasters, including but not limited to those caused by the Santa Ana winds and EI Nino (or La Nina)
subtropical -like weather. This region is especially susceptible to more active termite and wood attacking
insects and microorganisms. The proposed modification to prohibit the use of wood foundation systems
as well as limit prescriptive design provisions in an effort to mitigate potential problems or deficiencies
due to the proliferation of wood -destroying organisms and therefore need to be incorporated into the code
to assure that new buildings and structures and additions or alterations to existing buildings or structures
2016 Edition of the California Building Code Page 65 of 118
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
are designed and constructed in accordance with the scope and objectives of the California Residential
Code.
2016 Edition of the California Building Code Page 66 of 118
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2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 114-02. Sections R403.1.2, R403.1.3.6 and R403.1.5 of the 2016 Edition of the California
Residential Code are amended to read as follows:
R403.1.2 Continuous footing in Seismic Design Categories Do, D, and DZ. Exterior walls of buildings
located in Seismic Design Categories Do, D, and DZ shall be supported by continuous solid or fully
grouted masonry or concrete footings. Lather feeting FRater+als eF systems shall he designed- in
aGGardaRn-e ,.,i+" ^ ented enginee.in^ ^ ^^fi,.e. All required interior braced wall panels in buildings
located in Seismic Design Categories Do, D, and DZ With nlaR dimeRSOGRG ^ e^fe. than 50 feet (15 249
with Serfi^n 8402.1.2.4, egGent f^r two-stwy hu ildin^S in 9e1CmiG Resign Gate^nni D i Whish all bFaGed
wall panels interior ^na eAeFi^. shall be supported on continuous foundations.
R403.1.3.6 Isolated concrete footings. In detached one- and two-family dwellings located in Seismic
Design Category A, B. or C that are three stories or less in height and constructed with stud bearing
walls, isolated plain concrete footings supporting columns or pedestals are permitted.
R403.1.5 Slope. The top surface of footings shall be level. The bottom surface of footings shall not have
a slope exceeding one unit vertical in 10 units horizontal (10 -percent slope). Footings shall be stepped
where it is necessary to change the elevation of the top surface of the footings or where the slope of the
bottom surface of the footings will exceed one unit vertical in 10 units horizontal (10 -percent slope).
For structures located in Seismic Design Categories Do D, or D,, stepped footings shall be reinforced
with four No. 4 rebar. Two bars shall be place at the top and bottom of the footings as shown in Figure
R403.1.5.
RECONB END; a > b
b 5 2'0°
N11N, 244 REBAR (TOP & BMalkf)
............0170M PLATE (m.)
l/
i
GRADE
STEPPED FOT ND.kTIONS
FIGURE R403.1.5
STEPPED FOOTING
RATIONALE:
2016 Edition of the California Building Code Page 67 of 118
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With the higher seismic demand placed on buildings and structures in this region, precautionary steps are
proposed to reduce or eliminate potential problems that may result for under -reinforced footings located
on sloped surfaces. Requiring minimum reinforcement for stepped footings is intended to address the
problem of poor performance of plain or under -reinforced footings during a seismic event. Furthermore,
interior walls can easily be called upon to resist over half of the seismic loading imposed on simple
buildings or structures. Without a continuous foundation to support the braced wall line, seismic loads
would be transferred through other elements such as non-structural concrete slab floors, wood floors, etc.
The proposed change is to limit the use of the exception to structures assigned to Seismic Design
Category A, B or C where lower seismic demands are expected. Requiring interior braced walls be
supported by continuous foundations is intended to reduce or eliminate the poor performance of buildings
or structures. This proposed amendment is consistent with an amendment adopted during previous code
adoption cycles for the California Residential Code.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to require continuous footings under braced wall lines, require reinforcement in one- and two-
family dwelling, and minimum reinforcement in stepped footings will improve performance of buildings or
structure during a seismic event and minimize potential problems or deficiencies and therefore need to be
incorporated into the code to assure that new buildings and additions to existing buildings are designed
and constructed in accordance with the scope and objectives of the California Residential Code.
2016 Edition of the California Building Code Page 68 of 118
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 114-03. Section R404.2 of the 2016 Edition of the California Residential Code is amended
to read as follows:
R404.2 Wood foundation walls. Wood foundation walls shall be constructed in accordance with the
provisions of Sections R404.2.1 through R404.2.6 and with the details shown in Figures R403.1(2) and
R403.1(3). Wood foundation walls shall not be used for structures located in Seismic Design Category Dom
D, or D,_
RATIONALE:
No substantiating data has been provided to show that wood foundation wall is effective in supporting
buildings and structures during a seismic event while being subject to deterioration caused by the
combined detrimental effect of constant moisture in the soil and wood -destroying organisms. Wood
foundation walls, when they are not properly treated and protected against deterioration, have performed
very poorly and have led to slope failures. Most contractors are typically accustomed to construction in
dry and temperate weather in the Southern California region and are not generally familiar with the
necessary precautions and treatment of wood that makes it suitable for both seismic event and wet
applications. The proposed amendment takes the precautionary steps to reduce or eliminate potential
problems that may result in using wood foundation walls that experience relatively rapid decay due to the
fact that the region does not experience temperatures cold enough to destroy or retard the growth and
proliferation of wood -destroying organisms. This proposed amendment is consistent with an amendment
adopted during previous code adoption cycles for the California Residential Code.
FINDINGS:
Local Climatic and Geological Conditions — The greater Los Angeles region is a densely populated area
having buildings and structures constructed over and near a vast array of fault systems capable of
producing major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. In
addition, the region is within a climate system capable of producing major winds, fire and rain related
disasters, including but not limited to those caused by the Santa Ana winds and EI Nino (or La Nina)
subtropical -like weather. This region is especially susceptible to more active termite and wood attacking
insects and microorganisms. The proposed modification to prohibit the use of wood foundation wall in an
effort to mitigate potential problems or deficiencies due to the proliferation of wood -destroying organisms
and therefore need to be incorporated into the code to assure that new buildings and structures and
additions or alterations to existing buildings or structures are designed and constructed in accordance
with the scope and objectives of the California Residential Code.
2016 Edition of the California Building Code Page 69 of 118
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP R5-01. Section R501.1 of the 2016 Edition of the California Residential Code is amended
to read as follows:
R501.1 Application. The provisions of this chapter shall control the design and construction of the floors
for buildings, including the floors of attic spaces used to house mechanical or plumbing fixtures and
equipment. Mechanical or plumbing fixtures and equipment shall be attached for anchored) to the
structure in accordance with Section R301.2.2.3.8
RATIONALE:
There is no limitation for weight of mechanical and plumbing fixtures and equipment in the California
Residential Code. Requirements from ASCE 7 and the California Building Code would permit equipment
weighing up to 400 lbs. when mounted at 4 feet or less above the floor or attic level without engineering
design. Where equipment exceeds this requirement, it is the intent of this proposed amendment that a
registered design professional is required to analyze if the floor support is adequate and structurally
sound.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to limit the equipment weight is intended to reduce injuries, save lives, and minimize
structural damages and therefore needs to be incorporated into the code to assure that new buildings and
structures and additions or alterations to existing buildings or structures are designed and constructed in
accordance with the scope and objectives of the California Residential Code.
2016 Edition of the California Building Code Page 70 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 115-02. Section R503.2.4 is added to Chapter 5 of the 2016 Edition of the California
Residential Code to read as follows:
R503.2.4 Openings in horizontal diaphragms. Openings in horizontal diaphragms with a dimension
perpendicular to the moist that is greater than 4 feet 0.2 m) shall be constructed in accordance with Figure
R503.2.4.
PLYWOOD SHEATHING
DIAPHRAGM OPENING
METAL TIE 16GA. x 1 11Z x 4'-0' MIN., (4 TOTAL)
WI 16-16d COMMON NAILS AS SHOWN
-OR.
METAL TIE 16GA. x 1 112"x (OPENING WIDTH + 4'-0") MIN.,
(2 TOTAL) W124 -16d COMMON NAILS
Far Sl: 1 inch = 25.4 mm. 1 font = 304.8 mm.
a. Blockings shall be provided beyond headers.
b. Metal ties not less than 0.058 inch [1.47 mm (16 galvanized gage)] by 1.5 inches (38 mm) wide With eight 16d common nails
on each side of the header -foist intersection. The metal ties shall have a minimum yield of 33.000 psi (227 MPa).
c. Openings in diaphragms shall be further limited in accordance With Section R301.2.2.2.5.
FIGURE R503.2.4
OPENINGS IN HORIZONTAL DIAPHRAGMS
RATIONALE:
Section R502.10 of the Code does not provide any prescriptive criteria to limit the maximum floor opening
size nor does Section R503 provide any details to address the issue of shear transfer near larger floor
openings. With the higher seismic demand placed on buildings and structures in this region, it is important
to ensure that a complete load path is provided to reduce or eliminate potential damages caused by
seismic forces. Requiring blocking with metal ties around larger floor openings and limiting opening size is
consistent with the requirements of Section R301.2.2.2.5.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to require specific detailing at large floor openings is intended to address the poor
performance of floor diaphragms with openings and limit or reduce property damages during a seismic
2016 Edition of the California Building Code Page 71 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
event and therefore needs to be incorporated into the code to assure that new buildings and structures
and additions or alterations to existing buildings or structures are designed and constructed in
accordance with the scope and objectives of the California Residential Code.
2016 Edition of the California Building Code Page 72 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP R6-01. Lines 35 and 36 of Table R602.3(1) of the 2016 Edition of the California
Residential Code are amended to read as follows:
TABLE 602.3(1)
FASTENING SCHEDULE—continued
REM DESCRIPTION OF BUILDING ELEMENTS NUMBER AND TWE OF FASTENERa• b.c SPACING AND LOCATION
Floor
24
2 "subfloor [o joist or girder
3-16d box (31/2 " 0.135 ); or
2-16d common (31/2"x 0.162')
Blind and face nail
25
2 "planks (plank & beam—floor & rooi)
3-16d box (3/,) "x 0.135'); or
2-16d (31/2 "x 0.162')
At each bearing, face nail
common
3-16d common (31/2 X 0.162)
26
Band or rim joist to joist
4-10 box (3 "x 0.128'), or
4-3 "x 0.131 "nails; or
End nail
4-3 "x 14 ga. staples, 7/16 "crown
20d common (4 "x 0.192 ); or
Nail each layer as follows: 32 "o.c.
at top and bottom and staggered.
10d box (3 "x 0.128 ); or
24 "o.c. face nail at top and bottom
27
Built-up girders and beams, 2 -inch lumber
3 "x 0.131 "nails
staggered on opposite sides
And:
layers
2-20d common (4 "x 0.192 ); or
3-10d box (3 "x 0.128); or
Face nail at ends and at each splice
3-3 "x 0.131 "nails
4-16d box (3 /2 "x 0.135'); or
3-16d common (31/2"x 0.162'); or
28
Ledger strip supporting joists or rafters
4-1Od box (3 "x 0.128 ); or
At each joist or rafter, face nail
4-3 "x 0.131 "nails
29
Bridging to joist
2-1Od (3 "x 0.128')
Each end, toe nail
SPACING OF FASTENERS
REM
DESCRIPTION
OF BUILDING ELEMENTS
NUMBER AND
TYPE OF FASTENERa, b, c
Edges h
(inches)
Intermediate
sllpportsc• e
(inches)
Wood structural panels, subfloor• roof and interior wall sheathing to framing and particleboard wall sheathing to framing
[see Table R602.3(3) for wood structural panel exferlorwall sheathing to wall framing]
6d common2i x 0.113' nail subfloor, wall i 6 12'
30 318 `- 1/2
8d common (2 /2 "x 0.131 ') nail (roof)
31 /32 "- 1 " 8d common nail (2'/2 "x 0.131 ) 6 12'
32 11/8 "- 11/4 " 10d common (3 "x 0.148 ) nail; or 6 12
"x ')
8d (21/2 0.131 deformed nail
Other wall sheathing9
33
/2 "structural cellulosic fiberboard
11/2 "galvanized roofing nail, /16 "hed
3
6
sheathing
diameter, or 1 "crown staple 16 ga., 11/4 "long
34
/32 "structural cellulosic
1 /q "galvanized roofing nail; /}6 "head diame-
"long
3
6
fiberboard sheathing
ter, or 1 "crown staple 16 ga., 1 /q
35 -
1 ' d
/2 gypsum sheathing
1 /2 "galvanized roofing nail; staple galvanized,
11/2 "long; 11/4 "screws, Type W or S
7
7
36 -
5 " d
/g gypsum sheathing
1 /q "galvanized roofing nail; staple galvanized,
5 5 "screws, S
1 /8 "long; 1 /g Type W
7
screws, or
Wood structural panels, combination subfloor underlayment to framing
37
3/4 "and less
6d deformed (i"x 0.120') nail; or
8d common (21/2 "x 0.101 ') nail
6
12
38
7/ "- 1 „
8d common (2 i2 "x 0.131 ') nail; or
"x
6
12
8
8d deformed (21/2 0.120) nail
39
11/ "- 11/
8 4
l Od common (3" x 0.148 ") nail; or
8d deformed (21 /2 "x 0.120') nail
6
12
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mile per hour = 0.447 m/s; 1 ksi = 6.895 MPa.
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
TABLE R602.3(1)—continued
FASTENING SCHEDULE
a. Nails are smooth -common, box or deformed shanks except where otherwise stated. Nails used for framing and sheathing connections shall have minimum
average bending yield strengths as shown: 80 ksi for shank diameter of 0.192 inch (20d common nail), 90 ksi for shank diameters larger than 0.142 inch but
not larger than 0.177 inch, and 100 ksi for shank diameters of 0.142 inch or less.
b. Staples are 16 gage wire and have a minimum 7116 -inch on diameter crown width.
c. Nails shall be spaced at not more than 6 inches on center at all supports where spans are 48 inches or greater.
d. Four -foot by 8 -foot or 4 -foot by 9 -foot panels shall be applied vertically.
e. Spacing of fasteners not included in this table shall be based on Table R602.3(2).
f. Where the ultimate design wind speed is 130 mph or less, nails for attaching wood structural panel roof sheathing to gable end wall framing shall be spaced 6
inches on center. Where the ultimate design wind speed is greater than 130 mph, nails for attaching panel roof sheathing to intermediate supports shall be
spaced 6 inches on center for minimum 48 -inch distance from ridges, eaves and gable end walls: and 4 inches on center to gable end wall framing.
g. Gypsum sheathing shall conform to ASTM C 1396 and shall be installed in accordance with GA 253. Fiberboard sheathing shall conform to ASTM C 208.
It. Spacing of fasteners on floor sheathing panel edges applies to panel edges supported by framing members and required blocking and at floor perimeters only.
Spacing of fasteners on roof sheathing panel edges applies to panel edges supported by framing members and required blocking. Blocking of roof or floor
sheathing panel edges perpendicular to the framing members need not be provided except as required by other provisions of this code. Floor perimetershall be
supported by framing members or solid blocking.
I. Where a rafter is fastened to an adjacent parallel ceiling joist in accordance with this schedule, provide two toe nails on one side of the rafter and toe nails from
the ceiling joist to top plate in accordance with this schedule. The toe nail on the opposite side of the rafter shall not be required.
j. Use of staples in braced wall panels shall be prohibited in Seismic Design Category Do. D� or D,.
RATIONALE:
The Structural Engineers Association of Southern California (SEAOSC) and the Los Angeles City Joint
Task Force that investigated the damages to buildings and structures during the 1994 Northridge
Earthquake recommended reducing allowable shear values in wood structural panel shear walls or
diaphragms that were not substantiated by cyclic testing. That recommendation was consistent with a
report to the Governor from the Seismic Safety Commission of the State of California recommending that
code requirements be "more thoroughly substantiated with testing." The allowable shear values for wood
structural panel shear walls or diaphragms fastened with staples are based on monotonic testing and
does not take into consideration that earthquake forces load shear wall or diaphragm in a repeating and
fully reversible manner.
In September 2007, limited cyclic testing was conducted by a private engineering firm to determine if
wood structural panels fastened with staples would exhibit the same behavior as the wood structural
panels fastened with common nails. The test result revealed that wood structural panel fastened with
staples appeared to be much lower in strength and stiffness than wood structural panels fastened with
common nails. It was recommended that the use of staples as fasteners for wood structural panel shear
walls or diaphragms not be permitted to resist seismic forces in structures assigned to Seismic Design
Category Do, D, and Dz unless it can be substantiated by cyclic testing.
This proposed amendment is a continuation of an amendment adopted during the previous code adoption
cycle.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to place design and construction limits on staples as fasteners used in wood structural panel
or diaphragms not substantiated with cyclic testing will help to maintain minimum quality of construction
and performance standards of structures and therefore need to be incorporated into the code to assure
that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Residential Code.
2016 Edition of the California Building Code Page 74 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Cade Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP R6-02. Footnote "b" of Table R602.3(2) of the 2016 Edition of the California Residential
Code is amended to read as follows:
b. Staples shall have a minimum crown width of 7/16 -inch on diameter except as noted. Use of staples in
roof, floor, subfloor, and braced wall panels shall be prohibited in Seismic Design Category Do D1, or D,.
RATIONALE:
The Structural Engineers Association of Southern California (SEAOSC) and the Los Angeles City Joint
Task Force that investigated the damages to buildings and structures during the 1994 Northridge
Earthquake recommended reducing allowable shear values in wood structural panel shear walls or
diaphragms that were not substantiated by cyclic testing. That recommendation was consistent with a
report to the Governor from the Seismic Safety Commission of the State of California recommending that
code requirements be "more thoroughly substantiated with testing." The allowable shear values for wood
structural panel shear walls or diaphragms fastened with staples are based on monotonic testing and
does not take into consideration that earthquake forces load shear wall or diaphragm in a repeating and
fully reversible manner.
In September 2007, limited cyclic testing was conducted by a private engineering firm to determine if
wood structural panels fastened with staples would exhibit the same behavior as the wood structural
panels fastened with common nails. The test result revealed that wood structural panel fastened with
staples appeared to be much lower in strength and stiffness than wood structural panels fastened with
common nails. It was recommended that the use of staples as fasteners for wood structural panel shear
walls or diaphragms not be permitted to resist seismic forces in structures assigned to Seismic Design
Category Do, D, and DZ unless it can be substantiated by cyclic testing.
This proposed amendment is a continuation of an amendment adopted during the previous code adoption
cycle.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to place design and construction limits on staples as fasteners used in wood structural panel
or diaphragms not substantiated with cyclic testing will help to maintain minimum quality of construction
and performance standards of structures and therefore need to be incorporated into the code to assure
that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Residential Code.
2016 Edition of the California Building Code Page 75 of 118
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP R6-03. Table R602.10.3(3) of the 2016 Edition of the California Residential Code is
amended to read as follows:
TABLE R602.10.3(3)
BRACING REQUIREMENTS BASED ON SEISMIC DESIGN CATEGORY
SOIL CLASS D
WALL HEIGHT = 10 FEET
10 PSF FLOOR DEAD LOAD
MINIMUM TOTAL LENGTH (FEET) OF BRACED WALL PANELS
15 PSF ROOFICEILING DEAD LOAD
REQUIRED ALONG EACH BRACED WALL LINE'
BRACED WALL LINE SPACING 5 25 FEET
Seismic Design
Story Location
Braced Wall Line
Length
Method LIB d
P
Method GB'
Methods
DWB, SFB, PBS,
Method
Methods
CS-WSP,
Cale o
9 ry
(feet)'
PCP, HPS, CS-
SFBe-f
WSP
CS -G
10
2.5
2.5
2.5
1.6
1.4
20
30
40
5.0
7.5
10.0
5.0
7.5
10.0
5.0
7.5
10.0
3.2
4.8
6.4
2.7
4.1
5.4
50
12.5
12.5
12.5
8.0
6.8
10
NP
4.5
4.5
3.0
2.6
C
(townhouses only)
20
30
NP
NP
9.0
13.5
9.0
13.5
6.0
9.0
5.1
7.7
40
NP
18.0
18.0
12.0
10.2
50
NP
22.5
22.5
15.0
12.8
10
NP
6.0
6.0
4.5
3.8
20
NP
12.0
12.0
9.0
7.7
30
NP
18.0
18.0
13.5
11.5
40
NP
24.0
24.0
18.0
15.3
50
NP
30.0
30.0
22.5
19.1
10
NP
24 5.6
2-8 5_6
1.8
1.6
20
NP
§& 11.0
§§ 11.0
3.6
3.1
30
40
NP
NP
83 16.6
44-.9 22.0
83 16.6
44,9 22.0
5.4
7.2
4.6
6.1
50
NP
-1-94 27.6
43 8 27.6
9.0
7.7
10
NP
r3 NP
-&4 NP
3.8
3.2
20
NP
4" NP
4-" NP
7.5
6.4
D0
30
NP
4" NP
4-5-8 NP
11.3
9.6
40
NP
24 4 NP
24-.4 NP
15.0
12.8
50
NP
244 NP
24.3 NP
18.8
16.0
10
20
NP
NP
a.3 NP
4-47.4 NP
7.4 NP
4-14 NP
5.3
10.5
4.5
9.0
30
NP
244 hT
241-8 NP
15.8
13.4
40
NP
39$ NP
21" NP
21.0
17.9
50
NP
363 NP
363 NP
26.3
22.3
(continued)
2016 Edition of the California Building Code Page 76 of 118
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
TABLE R602.10.3(3) -continued
BRACING REQUIREMENTS BASED ON SEISMIC DESIGN CATEGORY
SOIL CLASS D
WALL HEIGHT = 10 FEET
10 PSF FLOOR DEAD LOAD
MINIMUM TOTAL LENGTH (FEET) OF BRACED WALL PANELS
15 PSF ROOFICEILING DEAD LOAD
REQUIRED ALONG EACH BRACED WALL LINE'
BRACED WALL LINE SPACING 5 25 FEET
Seismic Design
Story Location
Braced Wall Line
Length
Method LIBd
f
Method GB"
Methods
DWB, SFB,
PBS, PCP,
Method
Methods
CS-WSP,
Category
(feet)`
HPS, CS-
WSP
CS-G
SFBed
10
NP
34 6_0
4$ 6.0
2.0
1.7
20
NP
" 12.0
" 12.0
4.0
3.4
30
40
NP
NP
44 18.0
4-2:G 24.0
;818.0
4-26 24.0
6.0
8.0
5.1
6.8
50
NP
4-x6 30.0
46-.6 30.0
10.0
8.5
10
NP
64 NP
64 NP
4.5
3.8
Dl
20
30
NP
NP
4-24 NP
44.4 NP
4-2-9 NP
4&.4 M
9.0
13.5
7.7
11.5
40
NP
34-6 NP
447.6 NP
18.0
15.3
50
NP
494 NP
49,6 NP
22.5
19.1
10
20
NP
NP
9.4 NP
4q-.4 NP
434 NE
47:8 NP
6.0
12.0
5.1
10.2
30
NP
34.5 NP
3 NP
18.0
15.3
40
NP
344 NP
340 NP
24.0
20.4
50
NP
42-.4 NP
423 NP
30.0
25.5
10
NP
44- s_o
44-- s_o
2.5
2.1
20
NP
84- 16.0
8-.@L- 16.0
5.0
4.3
30
40
NP
NP
1-2� 24.0
16 6 32.0
1-2-.0-24.0
1,1 8- 32.0
7.5
10.0
6.4
8.5
50
NP
29-.(�- 40.0
2n.( 40.0
12.5
10.6
10
NP
7,5 NP
�5 NP
5.5
4.7
20
30
NP
NP
4x8 NP
3-2-.4 NP
4§$ NNP
4-24 Ja
11.0
16.5
9.4
14.0
40
NP
494 NP
384 NP
22.0
18.7
DZ
50
NP
44-714 NP
47-4 LT
27.5
23.4
10
20
NP
NP
NP
NP
NP
NP
NP
NP
NP
NP
30
NP
NP
NP
NP
NP
40
NP
NP
NP
NP
NP
50
NP
NP
NP
NP
NP
10
NP
NP
NP
7.5
6.4
20
NP
NP
NP
15.0
12.8
Cripple wall below
30
NP
NP
NP
22.5
19.1
one- or two-story dwelling
40
NP
NP
NP
30.0
25.5
50
NP
NP
NP
37.5
31.9
a. Linear interpolation shall be pemtitted.
b. Wall bracing lengths are based on a soil site class "D." Interpolation of bracing length between the Sd, values associated with the seismic design categories
shall be permitted when a site-specific Sd, value is determined in accordance with Section 1613.3 of the International Building Code.
c. Where the braced wall line length is greater than 50 feet, braced wall lines shall be permitted to be divided into shorter segments having lengths of 50 feet or
less, and the amount of bracing within each segment shall be in accordance with this table.
d. Method LIB shall have gypsum board fastened to not less than one side with nails or screws in accordance with Table R602.3(1) for exterior sheathing or
Table R702.3.5 for interior gypsum board. Spacing of fasteners at panel edges shall not exceed 8 inches.
e. Method CS-SFB does not apply in Seismic Design Categories Do, Dl and DZ.
L Methods GB and PCP braced wall panel h/w ratio shall not exceed 1:1 in SDC Dp, Di or D,. Methods DWB, SFB. PBS, and BPS are not permitted in SDC
Da, D, or D,
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2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
RATIONALE:
Due to the high geologic activities in the Southern California area and the expected higher level of
performance on buildings and structures, this proposed local amendment increase the length and limits
the location where shear walls sheathed with lath, plaster or gypsum board are used in multi-level
buildings. In addition, shear walls sheathed with other materials are prohibited in Seismic Design
Category Do, D, and DZ to be consistent with the design limitation for similar shear walls found in the
California Building Code. The poor performance of such shear walls in the 1994 Northridge Earthquake
was investigated by the Structural Engineers Association of Southern California (SEAOSC) and the Los
Angeles City Task Force and formed the basis for this proposed amendment. Considering that shear
walls sheathed with lath, plaster or gypsum board are less ductile than steel moment frames or wood
structural panel shear walls, the cities and county of the Los Angeles region has taken the necessary
measures to limit the potential structural damage that may be caused by the use of such walls at the
lower level of multi-level building that are subject to higher levels of seismic loads. This proposed
amendment is a continuation of an amendment adopted during the previous code adoption cycle.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to increase the length and limit the location where shear walls sheathed with lath, plaster or
gypsum board are used will help to ensure that multi-level building will reach its performance objective in
resisting higher levels of seismic loads and therefore need to be incorporated into the code to assure that
new buildings and structures and additions or alterations to existing buildings or structures are designed
and constructed in accordance with the scope and objectives of the California Residential Code.
2016 Edition of the California Building Code Page 78 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP R6-04. Table R602.10.4 of the 2016 Edition of the California Residential Code is
amended to read as follows:
TABLE R602.10.4
BRACING METHODS t
(contimecrl)
2016 Edition of the California Building Code Page 79 of 118
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CONNECTION CRITERIA'
METHODS, MATERIAL
MINIMUM THICKNESS
FIGURE
Fasteners
Spacing
I x 4 wood or
Wood: 2-8d common nails
Wood: per stud and
approvedmetal straps
or
top and bottom plates
LIB
145 60" angles for
' t 6
at 45" t
3-8d (2'/_" long x 0.1 13" Via.) nails
Let -in -bracing
maximum 16"
~ " "
Metal:
stud spacing
Metal strap: per manufacturer
per manufacturer
DtR'B
'/.,'Y t " nominal) for`
~
2-8d (2'/," lona- x 0.113 " dia.) nails
Diagonal
maximum 34"
FEW
or
Per stud
wood boards
stud spacing
2 - 131" long staples
IVSP
8d common !2172"x0.131) nails k_ -
tnro==T=r
6 'wises 12" field
W'ood8"
)3 edge distance to panel edge
structural panel
4
Innnnulr�t i• .
(See Section R604)
15132"
8d common (2172"x0.131)nails
6"edges 12"field
38" edge distance to panel edge R6013(1) -•- ,-
BE'-`VSP`
Wood Structural
4" at panel edges
Panels with Stone
'r ••
See Figure R602.10.6 5
8d common (2`?," x 0.131) nails
12" at intermediate
or Masonry Veneer
'G
`
supports 4" at braced
(See Section
wall panel end posts
R602.10.6.5)
a
I'/,"long x 0.12"dia. (for 4/," thick
Strut ural
`," or `-`/,," for
`
sheathing) t'/,,- long x 0.1 ry" dia.
fiberboard sheath-
maximunr 16"
(for "I, `thick shcathing)
3 edges 6" Geld
x
stud spacing
T` '�" 1
galvanized roofing nails or Sd common
in,
('211 "long x 0.131 "dia.) nails
Nails or screws per Table R602.30) for
For all braced wall
GE
-'
exterior locations
panel locations: 7"
Gypsum board
ed (includinb top
d bottom plates) .
NailsL�1 Nails or screws per Table R7023.5 for
interior locations
field
PES
Fa board
if, for for
- - �_
For %f , 6d common
(2" long x 0.1 l nails
heat
sheathing
maximum l6"
,
comm
For'!,". 8d common
3"wises 6" Geld
(See Section R
R605)
studspacing
stud
�
(211,"long x 0.131 "dia) nails
PCP
See Section R703.6 for
-�
1'/," long_ I I sage.'!,,"dia. head nails
6" o.c_ on all framing
Portland
cement plaster
maximum 16"=r"
stud spacing
or 3
r' long. 16 gage staples
%
members
HPS'r
"forn3aximum 16"
0.092"dia_, D.225"dia- head nails with
Hardboard
"
stud spatting
length to accommodate I'1,"
4" edges 8" Geld
panel siding
_
penetration into studs
_WV
See
Alternate
',+ "
a
1
Sec Section R602.10.6.1
Section 8602-10.6-I
braced wall
4''�3-
(contimecrl)
2016 Edition of the California Building Code Page 79 of 118
2016 Edition of the California Residential Code Final Version: 08/0512016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
TABLE R602.10.4—continued
BRACING METHODS f
Fos SI: t inch= 25-4 mm. t fool =305 mm. I degree = 0.0175 rad. 1 pound per square foot = 47.3 Mir'. I mile per hour = 0.447 mis.
a. Adhesive attachment of wall sheathing, including Method GB, shall not be permitted in Seismic Design Categories C, Do, Dl and D2.
b. Applies to panels next to garage door opening where supporting gable end wall or roof load only. Shall only be used on one wall of the garage. In Seismic
Design Categories Do, Dl and DZ roof covering dead load shall not exceed 3 psf.
c. Garage openings adjacent to a Method CS -G panel shall be provided with a header in accordance with Table R602.5(l). A full -height clear opening shall not
be permitted adjacent to a Method CS -G panel.
d. Method CS-SFB does not apply in Seismic Design Categories Do, D1 and D2.
e. Method applies to detached one- and two-family dwellings in Seismic Design Categories Do through D2 only.
f Methods GB and PCP braced wall panel h/w ratio shall not exceed 1:1 in SDC Da, D,, or Da. Methods LIB, DWB, SFB, PBS. HPS, and PFG are not
permitted in SDC Dg Dy or D,.
& Use of staples in braced wall panels shall be prohibited in SDC DO, D,, or Dy.
RATIONALE:
3/8" thick 3 ply -plywood shear walls experienced many failures during the Northridge Earthquake. Box
nails were observed to cause massive and multiple failures of the typical 3/8" thick 3 -ply plywood during
the Northridge Earthquake. This proposed amendment specifies minimum sheathing thickness, nail size
and spacing so as to provide a uniform standard of construction for designers and buildings to follow. This
is intended to improve the performance level of buildings and structures that are subject to the higher
seismic demands and reduce and limit potential damages to property. This proposed amendment reflects
the recommendations by the Structural Engineers Association of Southern California (SEAOSC) and the
Los Angeles City Joint Task Force that investigated the poor performance observed in 1994 Northridge
Earthquake.
In September 2007, limited cyclic testing was conducted by a private engineering firm to determine if
wood structural panels fastened with staples would exhibit the same behavior as the wood structural
panels fastened with common nails. The test result revealed that wood structural panel fastened with
2016 Edition of the California Building Code Page 80 of 118
2016 Edition of the Califomia Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
CONNECTION CRITERIA'
METHODS, MATERIAL
MINIMUM THICKNESS
RGURE
FastenGm
Spacing
PFH
Portal frame with
'/s"
See Section R602.10-6.2
See Section R602.10.6,2
z
❑m
hold-downs
C
L
cn
PFG
rro-1
See Section R602.10-6-3
See .Section R602.10.6.3
Portal frame at garage
8d common (21 !2'x0.131) nails
6"edges 12" field
CS-WSP
3f8" edge distance to panel ed a
Continuously sheathed
'' "
�s
wood structural parcel
162„ 8d
common (212"x0.131) nailsry
6"edges I2" field
3f8"
edge distance to iognel edge ithle R692.30)-- -
Conunuouslysheathed
wood structural panel
See See Method CS-WSP
See Method CS-WSP
adjacent to garage
F.
openings
16!32"
7
a
CS -PF
Continuously sheathed!_
_ ,
Sege Section R602.10.6.-4
See Section R602.10.6.4
Portal frame
16!32"
°
P/2" long x 0.12"dia.
E
(for il,- thick sheathing)
U
CS -SFS,
°I,- or st,"' for
~-
0"long x 0. l2"dia.
Sj, "
Continuously sheathed
maximum 16"
(for thick sheathing)
3"edges 6" field
structural fiberboard
stud spacing
galvanized rooting mails or
8d common
(242" long x 0-131"dia.) nails
Fos SI: t inch= 25-4 mm. t fool =305 mm. I degree = 0.0175 rad. 1 pound per square foot = 47.3 Mir'. I mile per hour = 0.447 mis.
a. Adhesive attachment of wall sheathing, including Method GB, shall not be permitted in Seismic Design Categories C, Do, Dl and D2.
b. Applies to panels next to garage door opening where supporting gable end wall or roof load only. Shall only be used on one wall of the garage. In Seismic
Design Categories Do, Dl and DZ roof covering dead load shall not exceed 3 psf.
c. Garage openings adjacent to a Method CS -G panel shall be provided with a header in accordance with Table R602.5(l). A full -height clear opening shall not
be permitted adjacent to a Method CS -G panel.
d. Method CS-SFB does not apply in Seismic Design Categories Do, D1 and D2.
e. Method applies to detached one- and two-family dwellings in Seismic Design Categories Do through D2 only.
f Methods GB and PCP braced wall panel h/w ratio shall not exceed 1:1 in SDC Da, D,, or Da. Methods LIB, DWB, SFB, PBS. HPS, and PFG are not
permitted in SDC Dg Dy or D,.
& Use of staples in braced wall panels shall be prohibited in SDC DO, D,, or Dy.
RATIONALE:
3/8" thick 3 ply -plywood shear walls experienced many failures during the Northridge Earthquake. Box
nails were observed to cause massive and multiple failures of the typical 3/8" thick 3 -ply plywood during
the Northridge Earthquake. This proposed amendment specifies minimum sheathing thickness, nail size
and spacing so as to provide a uniform standard of construction for designers and buildings to follow. This
is intended to improve the performance level of buildings and structures that are subject to the higher
seismic demands and reduce and limit potential damages to property. This proposed amendment reflects
the recommendations by the Structural Engineers Association of Southern California (SEAOSC) and the
Los Angeles City Joint Task Force that investigated the poor performance observed in 1994 Northridge
Earthquake.
In September 2007, limited cyclic testing was conducted by a private engineering firm to determine if
wood structural panels fastened with staples would exhibit the same behavior as the wood structural
panels fastened with common nails. The test result revealed that wood structural panel fastened with
2016 Edition of the California Building Code Page 80 of 118
2016 Edition of the Califomia Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
staples appeared to be much lower in strength and stiffness than wood structural panels fastened with
common nails. It was recommended that the use of staples as fasteners for wood structural panel shear
walls or diaphragms not be permitted to resist seismic forces in structures assigned to Seismic Design
Category Do, D, and DZ unless it can be substantiated by cyclic testing.
This proposed amendment is a continuation of an amendment adopted during the previous code adoption
cycle.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near.a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to place design and construction limits on stapled nail fasteners used in wood structural
panel shear walls not substantiated with cyclic testing and requiring minimum sheathing thickness and
nailing type and size will help to maintain minimum quality of construction and performance standards of
structures and therefore need to be incorporated into the code to assure that new buildings and additions
to existing buildings are designed and constructed in accordance with the scope and objectives of the
California Residential Code.
2016 Edition of the California Building Code Page 81 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP R6-05. Figure R602.10.6.1 of the 2016 Edition of the California Residential Code is
amended to read as follows:
PANELLENGTHPER
TABLE 860210.5 TOP PLATE SHALL BE CONTINUOUS
OVER BRACED WALL PANEL
1522"
IA IN,yr�w00 D
STRUCTURAL PANEL
SHEATHING ON ONE FACE
MIN LXX FRAJONGrAN —
DOUBLE STUDS REQUIRED
(2)HOLD-DOWN OR (2)STRAP-TYPE -
ANCHORS PER TABLE R602.10.6.1 (OP
OF EACH SHOWN F 0R CLARITY)_
STRAP-TVPEANCHORS SHALL BE _
PERMITTED TO BE ATTACHED OVER
THE SNOOD Si RUCTURAL PANEL
PANEL MUST 9E.A7TACHED
TO CONCRETE FOOTING OR
CONCRETE FOUNDATION
'GALL CDN[TIMUOUS OVER
BRACED WALL UNE
{2) 112' DIAMETERANCHOR
BOLTS LOCATED BETWEEN
6' AND 12' OF EACH END OF
THE SEGMENT
FOR PANEL SPLICE SIF NEEDED)
ADJOINING PANELEDGES SHALL MEET
OVER AND BE FASTENED TO COLIM ON
FRAMING
80 COMMON 13R-SAL.'-6£ii-NAILS @J 6-
O.C. AT PANEL EDGES. FOR SIIJGLE
STORY AND @ 4- O.C. PANEL EDGES
FOR THE FIRST OF 2 STORIES
STUDS UNDER HEADER AS REQUIRED
8D CO1AIAON 9-m-G,V @QX NAILS @ 12'
O.C. AT INTERIOR SUPPORTS
WIN. REINFORCING OF FOUNDATION,
ONE :4 BAR TOP AND BOTTOII LAP
BARS #--Id1NIMUTA
24"
MINIMUM FOOTING SIZE UNDER
OPENI NG I5 12- X 12'.-Pri-UF"i iEE-SO W f i
FIGURE R602.10.6.1
METHOD ABW—ALTERNATE BRACED WALL PANEL
RATIONALE:
3/8" thick 3 ply -plywood shear walls experienced many failures during the Northridge Earthquake. Box
nails were observed to cause massive and multiple failures of the typical 3/8" thick 3 -ply plywood during
the Northridge Earthquake. This proposed amendment specifies minimum sheathing thickness, nail size
and spacing so as to provide a uniform standard of construction for designers and buildings to follow. This
is intended to improve the performance level of buildings and structures that are subject to the higher
seismic demands and reduce and limit potential damages to property. This proposed amendment reflects
the recommendations by the Structural Engineers Association of Southern California (SEAOSC) and the
Los Angeles City Joint Task Force that investigated the poor performance observed in 1994 Northridge
Earthquake. This proposed amendment is a continuation of an amendment adopted during the previous
code adoption cycle.
FINDINGS:
2016 Edition of the California Building Code Page 82 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification requiring minimum sheathing thickness and nailing type and size will help to maintain
minimum quality of construction and performance standards of structures and therefore need to be
incorporated into the code to assure that new buildings and additions to existing buildings are designed
and constructed in accordance with the scope and objectives of the California Residential Code.
2016 Edition of the California Building Code Page 83 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 116-06. Figure R602.10.6.2 of the 2016 Edition of the California Residential Code is
amended to read as follows:
EXTENT OF HEADER WITH DOUBLE PORTAL FRAMES (TWO BRACED WALL
2'-18' FINISHED WIDTH OF OPENING
FOR SINGI FOR DOUBLE PORTAL
- =.=.l SIZE UNDER OPENING IS 10111.
—MIN. (1) Ve DIAMETER ANCHOR BOLT INSTALLED PER
SECTION R403.1.6- WITH 2";; %914 PLATE WASHER
3°x3'k0.229°
FRONT ELEVATION SECTION
For SI: I inch = 25.4 mm, I foot = 304.8 mm.
FIGURE R602.10.6.2
METHOD PFH—PORTAL FRAME WITH HOLD-DOWNS
AT DETACHED GARAGE DOOR OPENINGS
RATIONALE:
FASTEN KING STUD
TO HEADER WITH 6
16D SINKERS
—FASTEN TOP
PLATETO
HEADER WITH
TWO
ROWS OF 16D
SINKER NAILS AT
3' O.C. TYP.
—MIN.'FrWOOD
STRUCTURAL
PANEL
SHEATHING
3/8" thick 3 ply -plywood shear walls experienced many failures during the Northridge Earthquake. Box
nails were observed to cause massive and multiple failures of the typical 3/8" thick 3 -ply plywood during
the Northridge Earthquake. This proposed amendment specifies minimum sheathing thickness, nail size
and spacing so as to provide a uniform standard of construction for designers and buildings to follow. This
is intended to improve the performance level of buildings and structures that are subject to the higher
seismic demands and reduce and limit potential damages to property. This proposed amendment reflects
the recommendations by the Structural Engineers Association of Southern California (SEAOSC) and the
Los Angeles City Joint Task Force that investigated the poor performance observed in 1994 Northridge
Earthquake. This proposed amendment is a continuation of an amendment adopted during the previous
code adoption cycle.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification requiring minimum sheathing thickness and nailing type and size will help to maintain
minimum quality of construction and performance standards of structures and therefore need to be
2016 Edition of the California Building Code Page 84 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
' NIIN 3'x11'/.' NET HEADER STEEL HEADER PROHIBITED
H
IF'/," SPACER IS USED, PLACE ON BACK -SIDE OF HEADER:
----- -- --- ----
IF NEEDED, PANEL
-_-_-
FASTEN SHEATHING TO HEADER WITH 8DIn
PLICE EDGES SHALL
a p
d
w
'pi
COMMON ORSAEYAN64EI3 BOA NAILS IN 3°CCUR
OVER AND BE
'
PATTERN AS SHOWN
AILEDTOCOMMON
e
HEADER TO JACK -STUD STRAP PER TABLE
LOCKINGWrrHINTHE
I DOLE 24° OF THE
PORTAL HEIGHT.
"
13602.10.6.4 ON BOTH SIDES OF OPENING
ROW OF 3" O.C.
OF3"U.C.
NEROWNAILING
OPPOSITE SIDE OF SHEATHINGNE
"
N EACH PANEL EDGE.
abs
oPi
i^PMIN- `NDN
DOUBLE 2.4 FRAMING COVERED
-"
16/32' U9 THICK WOOD STRUCTURAL PANEL SHEPICALPORTAL
,b—VJLTH BD COMMON 6RYANl�6BJF NAILS
FRAME CONSTRUCTION
3' O.C. IN PLL FRAMING (STUDS, BLOCKING
w
SILLS) TYR
MIN. LENGTH OF PANEL PER TABLE 8602.10
r
■
MIN. (2S 3500 LB STRAP -TYPE HOLD-DOWNS
(EMBL DED INTO CONCRETE AND NAILED I
FRAMING)
MIN. REINFORCING OF FOUNDATION, ONETOP
AND BOTTOM OF FOOTING. LAP BARMIN.
nn,�,.o��...�.,ED
- =.=.l SIZE UNDER OPENING IS 10111.
—MIN. (1) Ve DIAMETER ANCHOR BOLT INSTALLED PER
SECTION R403.1.6- WITH 2";; %914 PLATE WASHER
3°x3'k0.229°
FRONT ELEVATION SECTION
For SI: I inch = 25.4 mm, I foot = 304.8 mm.
FIGURE R602.10.6.2
METHOD PFH—PORTAL FRAME WITH HOLD-DOWNS
AT DETACHED GARAGE DOOR OPENINGS
RATIONALE:
FASTEN KING STUD
TO HEADER WITH 6
16D SINKERS
—FASTEN TOP
PLATETO
HEADER WITH
TWO
ROWS OF 16D
SINKER NAILS AT
3' O.C. TYP.
—MIN.'FrWOOD
STRUCTURAL
PANEL
SHEATHING
3/8" thick 3 ply -plywood shear walls experienced many failures during the Northridge Earthquake. Box
nails were observed to cause massive and multiple failures of the typical 3/8" thick 3 -ply plywood during
the Northridge Earthquake. This proposed amendment specifies minimum sheathing thickness, nail size
and spacing so as to provide a uniform standard of construction for designers and buildings to follow. This
is intended to improve the performance level of buildings and structures that are subject to the higher
seismic demands and reduce and limit potential damages to property. This proposed amendment reflects
the recommendations by the Structural Engineers Association of Southern California (SEAOSC) and the
Los Angeles City Joint Task Force that investigated the poor performance observed in 1994 Northridge
Earthquake. This proposed amendment is a continuation of an amendment adopted during the previous
code adoption cycle.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification requiring minimum sheathing thickness and nailing type and size will help to maintain
minimum quality of construction and performance standards of structures and therefore need to be
2016 Edition of the California Building Code Page 84 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
incorporated into the code to assure that new buildings and additions to existing buildings are designed
and constructed in accordance with the scope and objectives of the California Residential Code.
2016 Edition of the California Building Code Page 85 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP R6-07. Table R602.10.5 of the 2016 Edition of the California Residential Code is
amended to read as follows:
TABLE R602.10.5
MINIMUM LENGTH OF BRACED WALL PANELS
METHOD
(See Table R602.10.4)
8 feet
MINIMUM LENGTH'
(inches)
Wall Height
9 feet 10 feet 11 feet
12 feet
CONTRIBUTING LENGTH
(Inches)
DWB, WSP, SFB, PBS, PCP, HPS, BV-WSP
48
48
48
53
58
Actual
GB
48
48
48
53
58
Double sided = Actual
Single sided = 0.5 x Actual
LIB
55
62
69
TVP
NP
Actual
ABW
SDC A, B and C, ultimate
design
wind speed < 140 mph
28
32
34
38
42
48
SDC Do, Dl and D2, ultimate
design 32 32 34 NP NP
wind speed < 140 mph
PFH
Supporting roof only
4Fi 24
44 24
-16 24
+89 �
2' &c 24�
48
Supporting one story and roof 24 24 24 27` 29`
48
PFG
24
27
30
33
36
1.5 x Actual
CS -G
24
27
30
33
36
Actual
SDC A, B and C
16
18
20
22e
24e
1.5 x Actual
CS -PF
SDC Do, Dl and D2
}g 24
-18 04
2g 24
.Lz �4e
24e
Actual
Adjacent clear opening height
(inches)
CS-WSP, CS-SFB
s 64
24
27
30
33
36
Actualb
68 26 27 30 33 36
72 27 27 30 33 36
76 30 29 30 33 36
80 32 30 30 33 36
84 35 32 32 33 36
88 38 35 33 33 36
92 43 37 35 35 36
96 48 41 38 36 36
100 — 44 40 38 38
104 — 49 43 40 39
108 — 54 46 43 41
112 — — 50 45 43
116 — — 55 48 45
120 60 52 48
124 — — — 56 51
128 — — — 61 54
132 — — — 66 58
136 62
140 — — — — 66
144 — — — — 72
For SI: I inch = 25.4 mm, 1 foot = 304.8 mm, 1 mile per hour = 0.447 m/s.
NP = Not Permitted.
a. Linear interpolation shall be permitted.
b. Use the actual length where it is greater than or equal to the minimum length.
c. Maximum header height for PFH is 10 feet in accordance with Figure R602.10.6.2, but wall height shall be permitted to be increased to 12 feet with pony wall.
d. Maximum opening height for PFG is 1.0 feet in accordance with Figure R602.10.6.3, butwall heightshall be permitted to be increased to 12 feet with ponywall.
e. Maximum opening height forCS-PF is 10 feet in accordance with Figure R602.10.6.4, but wall heightshall be permitted to be increased to 12 feetwith ponywall.
2016 Edition of the California Building Code Page 86 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
RATIONALE:
It was observed by the Structural Engineer Association of Southern California (SEAOSC) and the Los
Angeles City Task Force that high aspect ratio shear walls experienced many failures during the 1994
Northridge Earthquake. This proposed amendment provides a uniform standard of construction for
designers and buildings to follow. This is intended to improve the performance level of buildings and
structures that are subject to the higher seismic demands and reduce and limit potential damages to
property. This proposed amendment is consistent with an amendment adopted during the previous code
adoption cycle for the California Residential Code.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification ensures that the structural integrity with respect to "maximum shear wall aspect ratios" is
maintained, therefore need to be incorporated into the code to assure that new buildings and additions to
existing buildings are designed and constructed in accordance with the scope and objectives of the
California Residential Code.
2016 Edition of the California Building Code Page 87 of 118
2016 Edition of the California Residential Code Final Version: 08/06/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 116-08. Section R602.10.2.3 of the 2016 Edition of the California Residential Code is
amended to read as follows:
R602.10.2.3 Minimum number of braced wall panels. Braced wall lines with a length of 16 feet (4877
mm) or less shall have a minimum of two braced wall panels of any length or one braced wall panel equal
to 48 inches (1219 mm) or more. Braced wall lines greater than 16 feet (4877 mm) shall have a minimum
of two braced wall panels. No braced wall panel shall be less than 48 inches in length in Seismic Design
Category Do, Q1, or D,.
RATIONALE:
Plywood shear walls with high aspect ratio experienced many failures during the Northridge Earthquake.
This proposed amendment specifies a minimum braced wall length to meet an aspect ratio consistent
with other sections of the Residential Code as to provide a uniform standard of construction for designers
and buildings to follow. This is intended to improve the performance level of buildings and structures that
are subject to the higher seismic demands and reduce and limit potential damages to property. This
proposed amendment reflects the recommendations by the Structural Engineers Association of Southern
California (SEAOSC) and the Los Angeles City Joint Task Force that investigated the poor performance
observed in 1994 Northridge Earthquake. This proposed amendment is consistent with an amendment
adopted during previous code adoption cycles for the California Residential Code.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification reduces the aspect ratio help to maintain minimum quality of construction and performance
standards of structures and therefore need to be incorporated into the code to assure that new buildings
and additions to existing buildings are designed and constructed in accordance with the scope and
objectives of the California Residential Code.
2016 Edition of the California Building Code Page 88 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP R6-09. Figure R602.10.6.4 of the 2016 Edition of the California Residential Code is
amended to read as follows:
:: ii 12PFRMA. GANCNORS
STF.GC'R:RAL PA,YEL uAILSOLE RATE�;t AF -0 ACROSS
RR:GTTCP TO:CST PER $HEITHINGJQNTHIITHA
6T r:yLE
-.N CAPCAPACITY CF4T LBS IN.
_ TH—ORIZCNTALAt(C
VEP.TICAL DIR ECTI0Y5
TELT CFH=:CER. IY OLBLE P0a T.AL FP,AA@$1Tt/O a'+.FCED \PALL
PAVEL4)
EXTENT CF HMR Mr -I SINGLE PORTAL FRWE
{CNE 6PACED TALL PAH:EL)
IH'HEtT PCRTK$t.EATHt: IGCCFSNOT LAPOVER MA40 OR P.C.I:CIST)
"-IV FIN GHED'0bOTHOFOPERING
- .
.,rD:EPIi.TE
CDYTNIFAIS OL'ER-1. �+J:OISTPP.
a DR R:nf:C15T TABLE pn"N1)
S
H4'e=:a
j`��FCR SINGLE Cfl DOVELE PORTAL
ATTIC. SHE:IH:,'
BAND OR RIfd:C(ST NI r
8". CO+.f.tavtL'.ILSAT3-
_..
TLICSi STRAPPER
TABLE 002:0 d+
ppHy yVAy
(ON OPPOSREG:DE
HEIGHT
OF SHEATHING)
..
RRYED VtALL UNE
-»
'.Lti 3'X 11 t NET �E;,=R
'
STEELHUO E4 tG
MCBREO
-
X
CONTINOOD SL' uCTRAI. L
ED
\v ITH WOOD STRDCN
FASTER S+EATHING TC HF>D Et ::TH T>
PP1tEL.S
to
G?ILtDH OR G-1111 BDx ei:ILSLR GRD
i
•�
PARERH AS SHC111
F D
'{
5
E 5 Wltl
-LICE LICE DGE101S
Y
•{
RCO210 TC 11 BOTH S STRAF FEP.TA®.E
BOTH DfEN1iG
OCCUR N+D 6S
ATTiLHEJ TO
` V
{
CPPC$tiE RICE 09 SRE:.T++. EtG
—CSIIE IC
C31INIO"30cK916
C =
•S y
\T 2= O"NELL
X �
'{ Y
•S K
701:B1NOOF P?bTYOCOVc-i- R:tl
C.
n. H
OF 3HEIGHT ONE R9
OF 3•C.C. N?tLLtiG IS
S
. 4EL
15(.32"+—T'HCR IVOOO cOmi.=4OTRVGTURAL PAY Ci
RECJIRED '31'--A'H
$HEAMINOVIRH-CDL'T.TDtI OR, CAL'JAYIZEO
PA)tE'L=DGE
{
BDM1 .YA(LB ATS C.C. I>: AL' FRAtt:1tG ISNDS.
BL(`CFING. AND ER151 LYP.
TYFIC PORTAL
v
Ell. LENGTH OF PI:IELPER TELE RL02:M
Lam\
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'{
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INSTALLED PER R403t,:'NITH=11-- . PLATE
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(% ISIG NAt&OtDSND).
LYASHER
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; I
nu1ABER OF :
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OVER MICRETE OR EIASONRY BLOCK FOLIIIDATION
9E--- R— 115
:: ii 12PFRMA. GANCNORS
STF.GC'R:RAL PA,YEL uAILSOLE RATE�;t AF -0 ACROSS
RR:GTTCP TO:CST PER $HEITHINGJQNTHIITHA
6T r:yLE
-.N CAPCAPACITY CF4T LBS IN.
_ TH—ORIZCNTALAt(C
VEP.TICAL DIR ECTI0Y5
— -1.2 $Sa UCTURAL PANEL BHEATW.NG O':R AFPROtED BiNO OR P.ILIJCGT if
RAI SED WOOD FLOOR - OVERLAP OPTRTN
PORT?L SH EATHING LAPS OVER BANG OR RILI DDARD)
FRONT ELEVATION SECTION
For Sr: I inch = 25.4 mm. I foot = 304.5 mm.
FIGURE R602.10.6.4
METHOD CS -PF -CONTINUOUSLY SHEATHED PORTAL FRAME PANEL CONSTRUCTION
RATIONALE:
FASTE1t TOPFLATE TO
H EAJ ER WM4 TXO
ROM OF Ito SN)G3
NARG AT T O.C. INP.
15,32"
Aft: '3l;RAL P
$TR'KTL'R/l' FAttEL
SHFATH!I:G
NAIL SCLE
FLATE T0105T
PR TABLE
R CO2 2(l)
APPROVE' a NC
OR RIGA . T
I:AIL SC1E
PLATE rOJOGT
FER TABLE
RB02_L;)
APPROVE E.:HD
3/8" thick 3 ply -plywood shear walls experienced many failures during the Northridge Earthquake. Box
nails were observed to cause massive and multiple failures of the typical 3/8" thick 3 -ply plywood during
the Northridge Earthquake. This proposed amendment specifies minimum sheathing thickness, nail size
and spacing so as to provide a uniform standard of construction for designers and buildings to follow. This
is intended to improve the performance level of buildings and structures that are subject to the higher
seismic demands and reduce and limit potential damages to property. This proposed amendment reflects
the recommendations by the Structural Engineers Association of Southern California (SEAOSC) and the
Los Angeles City Joint Task Force that investigated the poor performance observed in 1994 Northridge
2016 Edition of the California Building Code Page 89 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
"N30= BTRLICTLRAL "LSHEATHHIIG OVRAFPP.
. SAND OR P11 -CST
OVER RAISED WOOD FLOOR - FRAIARIG AtICHOR OPTION
IH'HEtT PCRTK$t.EATHt: IGCCFSNOT LAPOVER MA40 OR P.C.I:CIST)
- .
.,rD:EPIi.TE
CDYTNIFAIS OL'ER-1. �+J:OISTPP.
a DR R:nf:C15T TABLE pn"N1)
S
H4'e=:a
ATTIC. SHE:IH:,'
BAND OR RIfd:C(ST NI r
8". CO+.f.tavtL'.ILSAT3-
O.0 TCP AND EOT TCV,f
— -1.2 $Sa UCTURAL PANEL BHEATW.NG O':R AFPROtED BiNO OR P.ILIJCGT if
RAI SED WOOD FLOOR - OVERLAP OPTRTN
PORT?L SH EATHING LAPS OVER BANG OR RILI DDARD)
FRONT ELEVATION SECTION
For Sr: I inch = 25.4 mm. I foot = 304.5 mm.
FIGURE R602.10.6.4
METHOD CS -PF -CONTINUOUSLY SHEATHED PORTAL FRAME PANEL CONSTRUCTION
RATIONALE:
FASTE1t TOPFLATE TO
H EAJ ER WM4 TXO
ROM OF Ito SN)G3
NARG AT T O.C. INP.
15,32"
Aft: '3l;RAL P
$TR'KTL'R/l' FAttEL
SHFATH!I:G
NAIL SCLE
FLATE T0105T
PR TABLE
R CO2 2(l)
APPROVE' a NC
OR RIGA . T
I:AIL SC1E
PLATE rOJOGT
FER TABLE
RB02_L;)
APPROVE E.:HD
3/8" thick 3 ply -plywood shear walls experienced many failures during the Northridge Earthquake. Box
nails were observed to cause massive and multiple failures of the typical 3/8" thick 3 -ply plywood during
the Northridge Earthquake. This proposed amendment specifies minimum sheathing thickness, nail size
and spacing so as to provide a uniform standard of construction for designers and buildings to follow. This
is intended to improve the performance level of buildings and structures that are subject to the higher
seismic demands and reduce and limit potential damages to property. This proposed amendment reflects
the recommendations by the Structural Engineers Association of Southern California (SEAOSC) and the
Los Angeles City Joint Task Force that investigated the poor performance observed in 1994 Northridge
2016 Edition of the California Building Code Page 89 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
Earthquake. This proposed amendment is a continuation of an amendment adopted during the previous
code adoption cycle.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification requiring minimum sheathing thickness and nailing type and size will help to maintain
minimum quality of construction and performance standards of structures and therefore need to be
incorporated into the code to assure that new buildings and additions to existing buildings are designed
and constructed in accordance with the scope and objectives of the California Residential Code.
2016 Edition of the California Building Code Page 90 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP R6-10. Section R606.4.4 of the 2016 Edition of the California Residential Code is
amended to read as follows:
R606.4.4 Parapet walls. Unreinforced solid masonry parapet walls shall not be less than 8 inches (203
mm) thick and their height shall not exceed four times their thickness. Unreinforced hollow unit masonry
parapet walls shall be not less than 8 inches (203 mm) thick, and their height shall not exceed three times
their thickness. Masonry parapet walls in areas subject to wind loads of 30 pounds per square foot (1.44
kPa) or located in Seismic Design Category Do, D, or D2, or on townhouses in Seismic Design Category
C shall be reinforced in accordance with Section R606.12.
RATIONALE:
The addition of the word "or" will prevent the use of unreinforced parapets in Seismic Design Category Do,
D, or Dz, or on townhouses in Seismic Design Category C.
This proposed amendment is a continuation of an amendment adopted during the previous code adoption
cycle.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to not allow the use of unreinforced masonry is intended to prevent non -ductile failures and
sudden structural collapses and therefore needs to be incorporated into the code to assure that new
buildings and structures and additions or alterations to existing buildings or structures are designed and
constructed in accordance with the scope and objectives of the California Residential Code.
2016 Edition of the California Building Code Page 91 of 118
2016 Edition of the California Residential Code Final Version: 08/06/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP R6-11. Section R606.12.2.2.3 of the 2016 Edition of the California Residential Code is
amended to read as follows:
R606.12.2.2.3 Reinforcement requirements for masonry elements. Masonry elements listed in
Section R606.12.2.2.2 shall be reinforced in either the horizontal or vertical direction as shown in Figure
oan,R606.11(3) and in accordance with the following:
Horizontal reinforcement. Horizontal joint reinforcement shall consist of
iyalls net a eed*Rg A 'RGhes (192 FAFn) in Adth; ..r at least one No. 4 bar spaced not more than
48 inches (1219 mm). Where tkvn- IGRgitudiRal wiFes-ofd e►RfGFeemerat aFe used, the spaGs
ht2bAxee ltncgp wo'rc hRn he the widest +ham+ +he rAeFtar i in+ ,.,ill ^da+e. Horizontal
reinforcement shall be provided within 16 inches (406 mm) of the top and bottom of these
masonry elements.
2. Vertical reinforcement. Vertical reinforcement shall consist of at least one No. 4 bar spaced not
more than 48 inches (1219 mm). Vertical reinforcement shall be within 4-6-8 inches (406mm) of
the ends of masonry walls.
RATIONALE:
Reinforcement using longitudinal wires for buildings and structures located in high seismic areas are
deficient and not as ductile as deformed rebar. Having vertical reinforcement closer to the ends of
masonry walls help to improve the seismic performance of masonry buildings and structures.
This proposed amendment is a continuation of an amendment adopted during the previous code adoption
cycle.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to increase reinforcements will ensure that the ductility requirements for buildings in high
seismic region meet the intent of the code and limit potential property damages and therefore need to be
incorporated into the code to assure that new buildings and structures and additions or alterations to
existing buildings or structures are designed and constructed in accordance with the scope and objectives
of the California Residential Code.
2016 Edition of the California Building Code Page 92 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP R6-12. Exception of Section R602.3.2 and Table R602.3.2 of the 2016 Edition of the
California Residential Code is amended to read as follows:
Exception: A—in other than Seismic Design Category Dom, or D,_a single top plate used as an
alternative to a double top plate shall comply with the following:
1. The single top plate shall be tied at corners, intersecting walls, and at in-line splices in straight
wall lines in accordance with Table R602.3.2.
2. The rafters or joists shall be centered over the studs with a tolerance of not more than 1 inch (25
mm).
3. Omission of the top plate is permitted over headers where the headers are adequately tied to
adjacent wall sections in accordance with Table R602.3.2.
TABLE R602.3.2
SINGLE TOP -PLATE SPLICE CONNECTION DETAILS
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
RATIONALE:
The cities and county of the Los Angeles region have taken extra measures to maintain the structural
integrity of the framing of the shear wall system for buildings and structures subject to high seismic loads
by eliminating single top plate construction. The performance of modern day braced wall panel
construction is directly related to an adequate load path extending from the roof diaphragm to the
foundation system. A single top plate is likely to be over nailed due to the nailing requirements at a rafter,
stud, tap plate splice, and braced wall panel edge in a single location. In addition, notching on a single
top plate for plumbing, ventilation and electrical wiring may reduce the load transfer capacity of the plate
without proper detailing. Majority of buildings and structures designed and built per the California
Residential Code with a single top plate may not need structural observation and special inspections. The
potential construction mistakes mentioned above could not be caught and corrected by knowledgeable
engineers and inspectors, and could jeopardize structural performance of buildings and structures located
in high seismic areas.
This proposed amendment is a continuation of an amendment adopted during the previous code adoption
cycle.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to eliminate the usage of a single top plate will help to maintain minimum quality of
construction and performance standards of structures and therefore need to be incorporated into the code
to assure that new buildings and structures and additions or alterations to existing buildings or structures
are designed and constructed in accordance with the scope and objectives of the California Residential
Code.
2016 Edition of the California Building Code Page 93 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
TOP -PLATE SPLICE LOCATION
CONDITION
Corners and Intersecting walls
ButtJolnts In straight walls
Splice plate size
Minimum nails
each side orJoint
Splice plate size
Minimum nails
each side orJoint
Structures in SDC A -C; and 1,8E)G
3" x 6" x 0.036"
(X $d box
3' x 12" x 0.036"
(12)
�L`T-4�
galvanized steel plate
(21/Z" x 0.113' Halls
galvanized steel plate
(2t /Z" x 0.113T') nails
spaeifig less than 26 feet
or equivalent
or equivalent
.1
Stfuetwes in E)G AgrAt a"d AE, wft-h
-3-x E by Q.Q 26'
eie
M
f2ltttx- ails
�}
x
{i1t` ls
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
RATIONALE:
The cities and county of the Los Angeles region have taken extra measures to maintain the structural
integrity of the framing of the shear wall system for buildings and structures subject to high seismic loads
by eliminating single top plate construction. The performance of modern day braced wall panel
construction is directly related to an adequate load path extending from the roof diaphragm to the
foundation system. A single top plate is likely to be over nailed due to the nailing requirements at a rafter,
stud, tap plate splice, and braced wall panel edge in a single location. In addition, notching on a single
top plate for plumbing, ventilation and electrical wiring may reduce the load transfer capacity of the plate
without proper detailing. Majority of buildings and structures designed and built per the California
Residential Code with a single top plate may not need structural observation and special inspections. The
potential construction mistakes mentioned above could not be caught and corrected by knowledgeable
engineers and inspectors, and could jeopardize structural performance of buildings and structures located
in high seismic areas.
This proposed amendment is a continuation of an amendment adopted during the previous code adoption
cycle.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to eliminate the usage of a single top plate will help to maintain minimum quality of
construction and performance standards of structures and therefore need to be incorporated into the code
to assure that new buildings and structures and additions or alterations to existing buildings or structures
are designed and constructed in accordance with the scope and objectives of the California Residential
Code.
2016 Edition of the California Building Code Page 93 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP 118-01. Section R803.2.4 is added to Chapter 8 of the 2016 Edition of the California
Residential Code to read as follows:
R803.2.4 Openings in horizontal diaphragms. Openings in horizontal diaphragms shall conform with
Section R503.2.4.
RATIONALE:
Section R802 of the Code does not provide any prescriptive criteria to limit the maximum roof opening
size nor does Section R803 provide any details to address the issue of shear transfer near larger roof
openings. With the higher seismic demand placed on buildings and structures in this region, it is important
to ensure that a complete load path is provided to reduce or eliminate potential damages caused by
seismic forces. Requiring blocking with metal ties around larger roof openings and limiting opening size is
consistent with the requirements of Section R301.2.2.2.5.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to require specific detailing at large roof openings is intended to address the poor
performance of roof diaphragms with openings and limit or reduce property damages during a seismic
event and therefore needs to be incorporated into the code to assure that new buildings and structures
and additions or alterations to existing buildings or structures are designed and constructed in
accordance with the scope and objectives of the California Residential Code.
2016 Edition of the California Building Code Page 94 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP R10-01. Section R1001.3.1 of the 2016 Edition of the California Residential Code is
amended to read as follows:
R1001.3.1 Vertical reinforcing. For chimneys up to 40 inches (1016 mm) wide, four No. 4 continuous
vertical bars adequately anchored into the concrete foundation shall be placed between wythes of solid
masonry or within the cells of hollow unit masonry and grouted in accordance with Section R609. Grout
shall be prevented from bonding with the flue liner so that the flue liner is free to move with thermal
expansion. For chimneys more than 40 inches (1016 mm) wide, two additional No. 4 vertical bars
adequately anchored into the concrete foundation shall be provided for each additional flue incorporated
into the chimney or for each additional 40 inches (1016 mm) in width or fraction thereof.
RATIONALE:
The performance of fireplace/chimney without anchorage to the foundation has been observed to be
inadequate during major earthquakes. The lack of anchorage to the foundation can result in the
overturning or displacement of the fireplace/chimney.
FINDINGS:
Local Geological Conditions — The greater Los Angeles region is a densely populated area having
buildings and structures constructed over and near a vast array of fault systems capable of producing
major earthquakes, including but not limited to the recent 1994 Northridge Earthquake. The proposed
modification to anchor masonry chimneys into concrete foundation will reduce injuries, save lives, and
minimize structural damages and therefore needs to be incorporated into the code to assure that new
buildings and structures and additions or alterations to existing buildings or structures are designed and
constructed in accordance with the scope and objectives of the California Residential Code.
2016 Edition of the California Building Code Page 95 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
PART III
LARUCP RECOMMENDED CODE AMENDMENTS TO THE
2016 EDITION OF THE CALIFORNIA GREEN BUILDING
STANDARDS CODE
(MANDATORY REQUIREMENTS)
2016 Edition of the California Building Code Page 96 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
SUMMARY OF RECOMMENDED LARUCP AMENDMENTS TO THE 2016 CALGREEN
(N) 2016
LARUCP
NO.
(E) 2013
LARUCP
NO.
TITLE/DESCRIPTION
STATUS
G1-16
G1-01
Add CALGreen Section 101.12 Fee for Mandatory Measures
R
G2-16
G1-02
Add CALGreen Section 101.12.1 Fee for TIER Measures
R
G3-16 I
G2-01
Amend CALGreen Section 202 Sustainability Definition
R
G4-16
G3-01
Amend CALGreen Section 301.1 Scope
R
G5-16
G3-02
Amend CALGreen Section 301.1.1 Additions & Alteration
R
G6-16
G5-01
Amend CALGreen Section 5.408.3 Excavated Soil and Land Clearing
Debris
R
FOOTNOTE:
1. R = Retain and update existing amendment, M = Modify existing amendment, D = Delete existing 2013 LARUCP amendment,
N = New amendment proposed.
2016 Edition of the California Building Code Page 97 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP G1-16. Section 101.12 is added to the 2016 Edition of the California Green Building
Standards Code to read as follows:
101.12 Fee for Mandatory Measures. A fee of ten percent (10%) of the plan check/permit fee shall be
assessed to verify compliance with the mandatory measure of this code.
OR ALTERNATIVELY
2016 LARUCP G1-16. Section [INSERT NUMBER] is added to the [INSERT NAME OF CITY] Municipal
Code to read as follows.
(INSERT SECTION NUMBER] Fee for Mandatory Measures. A fee of ten percent (10%) of the plan
check/permit fee shall be assessed to verify compliance with the mandatory measure of the California
Green Building Standards Code.
RATIONALE:
Due to the extra work it will take staff to review and verify compliance with the measures in the new code,
a recommended fee of 10% of either the plan check and/or permit is proposed. While it is understood that
each jurisdiction must determine what fee is appropriate for their municipality, the recommended 10% is a
starting point. This amount is based upon similar fees assessed for other supplemental reviews or
inspections such as for accessibility or energy compliance. It may be used as a basis for justifying the
proposed fees based upon comparison to other similar fees as indicated above.
FINDINGS:
Local Administrative Finding — This amendment is necessary for administrative clarification. It does not
modify a Building Standards pursuant to Sections 17958 and 18941.5 of the California Health and Safety
Code and does not require an express finding to be made pursuant to Sections 17958.5 and 17958.7 of
the California Health and Safety Code. This amendment established administrative standards for the
effective enforcement of green building standards and therefore need to be incorporated into the code to
assure that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Green Building
Standards Code.
2016 Edition of the California Building Code Page 98 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP G2-16. Section 101.12.1 is added to the 2016 Edition of the California Green Building
Standards Code to read as follows:
101.12.1 Fee for Tier Measures. When Tier 1 or Tier 2 measures need to be verified by the enforcing
agency, an additional ten percent (10%) of the plan check/permit fee shall be assessed.
OR ALTERNATIVELY
2016 LARUCP G2-16. Section [INSERT NUMBER] is added to the [INSERT NAME OF CITY] Municipal
Code to read as follows.
(INSERT SECTION NUMBERI Fee for Tier Measures. When Tier 1 or Tier 2 measures need to be
verified by the enforcinq agency, an additional ten percent- (10%) of the plan check/permit fee shall be
assessed.
RATIONALE:
Due to the extra work it will take staff to review and verify compliance with the measures in the new code,
a recommended fee of 10% of either the plan check and/or permit is proposed. While it is understood that
each jurisdiction must determine what fee is appropriate for their municipality, the recommended 10% is a
starting point. This amount is based upon similar fees assessed for other supplemental reviews or
inspections such as for accessibility or energy compliance. It may be used as a basis for justifying the
proposed fees based upon comparison to other similar fees as indicated above.
FINDINGS:
Local Administrative Finding — This amendment is necessary for administrative clarification. It does not
modify a Building Standards pursuant to Sections 17958 and 18941.5 of the California Health and Safety
Code and does not require an express finding to be made pursuant to Sections 17958.5 and 17958.7 of
the California Health and Safety Code. This amendment established administrative standards for the
effective enforcement of green building standards and therefore need to be incorporated into the code to
assure that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Green Building
Standards Code.
2016 Edition of the California Building Code Page 99 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP G3-16. Section 202 of the 2016 Edition of the California Green Building Standards Code
is amended to include the term "sustainability' that read as follows:
SUSTAINABILITY. Consideration of present development and construction impacts on the community,
the economy, and the environment without compromising the needs of the future.
RATIONALE:
CALGreen contains the word "sustainable" but does not define it. Although it is a term used in association
with green building, the word "sustainability" is often confused to mean the same as green building. The
proposed amendment allows clarity and distinguishing understanding while providing for a general
definition.
FINDINGS:
Local Administrative Finding — This amendment is necessary for administrative clarification. It does not
modify a Building Standards pursuant to Sections 17958 and 18941.5 of the California Health and Safety
Code and does not require an express finding to be made pursuant to Sections 17958.5 and 17958.7 of
the California Health and Safety Code. This amendment established administrative standards for the
effective enforcement of green building standards and therefore need to be incorporated into the code to
assure that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Green Building
Standards Code.
2016 Edition of the California Building Code Page 100 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP G4-16. Section 301.1 of the 2016 Edition of the California Green Building Standards Code
is amended to read as follows:
301.1 Scope. Buildings shall be designed to include the green building measures specified as mandatory
:i; the appliG,*;^^ Gher-Wists +a,^e^' in this code. Voluntary green building measures are also included
in this code the application checklists and may be included in the design and construction of structures
covered by this code, but are not required unless they are adopted by a city or county as specified in
Section 101.7.
RATIONALE:
The proposed editorial change provides clarity and consistency for the application of CALGreen.
FINDINGS:
Local Administrative Finding — This amendment is necessary for administrative clarification. It does not
modify a Building Standards pursuant to Sections 17958 and 18941.5 of the California Health and Safety
Code and does not require an express finding to be made pursuant to Sections 17958.5 and 17958.7 of
the California Health and Safety Code. This amendment established administrative standards for the
effective enforcement of green building standards and therefore need to be incorporated into the code to
assure that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Green Building
Standards Code.
2016 Edition of the California Building Code Page 101 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP G5-16. Section 301.1.1 of the 2016 Edition of the California Green Building Standards
Code is amended to read as follows:
Section 301.1.1 Additions and alterations. [HCD] The mandatory provisions of Chapter 4 shall be
applied to additions or alterations of existing residential buildings where the additions ^r alteratiA s
the buildillg'S eeRditiGRed area, velume, or size. The FequiFemeRt shall apply GR!y to and/8F
withiR the spec;iffiG aFea of the addition or alte„atici. Code sections relevant to additions and alterations
shall only apply to the portions of the building being added or altered within the scope of the permitted
work.
Note: On and after January 1, 2014, residential buildings undergoing permitted alterations, additions
or improvements shall replace noncompliant plumbing fixtures with water -conserving plumbing
fixtures. Plumbing fixture replacement is required prior to issuance of a certificate of final completion,
certificate of occupancy or final permit approval by the local building department. See Civil Code
Section 1101.1, et seq., for the definition of a noncompliant plumbing fixture, types of residential
buildings affected and other important enactment dates.
RATIONALE:
This proposed amendment simplifies the language and increase the scope of application that requires the
CALGreen Code to be applied to all residential projects. This section, as written, can only be applied to
an existing dwelling if the volume or size of the condition space is increased and does not encompass
interior remodels. This proposed amendment modifies the State language to require additions,
alterations, and interior remodels to comply with applicable sections of the CALGreen Code that are
relevant to the scope of work.
Studies have shown that new dwellings built equal to less than 10% of the total housing stock in the
State. Although new dwellings have complied with the CALGreen Code, the larger challenge is with
existing dwellings.
The bulk of California's energy is generated by aging power plants. Increasingly, the development and
application of alternate energy methods such as photovoltaics has gained market adoption. Coupling
these new energy generation processes with energy saving measures in the California Energy Code will
allow jurisdictions, states or the federal government to potentially offset the need to construct new power
plants, which would equate to a savings of billions of tax -payer dollars.
Water conservation is addressed by the CALGreen Code by implementing more restrictive requirements
for landscape irrigation and plumbing fixtures.
Indoor air quality is addressed by the CALGreen Code by implementing multiple limits for VOC (volatile
organic compounds) in paints, sealants and construction adhesives and formaldehyde contents in
composite wood products. These new standards that restricts VOC and formaldehyde contents have
shown to improve indoor air quality and minimize or eliminate occupant health issues related to sick
building syndrome.
FINDINGS:
Local Environmental Condition — This amendment is necessary on the basis of a local environmental
condition. The majority of the building stocks in the greater Los Angeles region are existing dwellings. To
reduce the impact that the existing dwelling is having on energy, water, and air quality, this amendment
proposes to address compliance with the CALGreen Code at the time when a permit is issued. Existing
buildings have been estimated to account for up to 40% of greenhouse gas emissions. This amendment
offset this impact on the communities by implementing more restrictive measures in the CALGreen Code,
whenever possible. Any residential projects that require a permit to be issued will be required to comply
with only those sections that are relevant to the scope of work and thereby begin to contribute to
2016 Edition of the California Building Code Page 102 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
improving the environment. This amendment established more restrictive green building standards for
improving the environment and therefore need to be incorporated into the code to assure that new
buildings and structures and additions or alterations to existing buildings or structures are designed and
constructed in accordance with the scope and objectives of the California Green Building Standards
Code.
2016 Edition of the California Building Code Page 103 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP G6-16. Section 5.408.3 of the 2016 Edition of the California Green Building Standards
Code is amended to read as follows:
5.408.3 Excavated soil and land clearing debris [BSC -CG] 100 percent of trees, stumps, rocks and
associated vegetation and soils resulting primarily from land clearing shall be reused or recycled. For a
phased project, such material may be stockpiled on site until the storage site is developed.
Exception: Reuse, either on -or off-site, of vegetation or soil contaminated by disease or pest
infestation.
Notes:
1. If contamination by disease or pest infestation is suspected, contact the County Agricultural
Commissioner and follow its direction for recycling or disposal of the material.
(www.cdfa.ca.gov/exec/ county/county_contacts.html)
2. For a map of known pest and/or disease quarantine zones, consult with the California
Department of Food and Agriculture. (www.cdfa.ca.gov)
3. Contaminated soil shall not be reused and shall be disposed of or remediated in accordance
with relevant regulations.
RATIONALE:
On occasions, projects are proposed on sites where the soil is contaminated and fall outside the scope of
a designated authority. The addition of Note #3 provides a mechanism for a jurisdiction to require the
removal or remediation of contaminated soils within guidelines established by that jurisdiction or method
developed by the applicant and approved by that jurisdiction.
FINDINGS:
Local Administrative Finding — This amendment is necessary for administrative clarification. It does not
modify a Building Standards pursuant to Sections 17958 and 18941.5 of the California Health and Safety
Code and does not require an express finding to be made pursuant to Sections 17958.5 and 17958.7 of
the California Health and Safety Code. This amendment established administrative standards for the
effective enforcement of green building standards and therefore need to be incorporated into the code to
assure that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Green Building
Standards Code.
2016 Edition of the California Building Code Page 104 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
PART IV
LARUCP RECOMMENDED CODE AMENDMENTS TO THE
2016 EDITION OF THE CALIFORNIA GREEN BUILDING
STANDARDS CODE
(VOLUNTARY REQUIREMENTS)
2016 Edition of the California Building Code Page 105 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
SUMMARY OF RECOMMENDED LARUCP AMENDMENTS TO THE 2016 CALGREEN
(N) 2016
LARUCP
NO.
(E) 2013
LARUCP
NO.
TITLE/DESCRIPTION
STATUSi
GA1-16
GA4-01
Amend CALGreen Section A4.105.2 Reuse of Materials
R
GA2-16
GA4-02
Amend CALGreen Section A4106.5 Cool Roof for Reduction of Heat
Island Effect
R
GA3-16
GA4-03
Amend CALGreen Section A4.303.4 Nonwater Supplied Urinals and
Waterless Toilets
R
GA4-16
GA4-04
Amend CALGreen Section A4.404.3 Building Systems
R
GA5-16
GA4-05
Amend CALGreen Section A4.405.1 Prefinished Building Materials
R
GA6-16
GA4-07
Amend CALGreen Section A4.405.4 Use of Building Materials From
Rapidly Renewable Sources
R
GA7-16
GA4-08
Amend CALGreen Section A4.407.1 Drainage Around Foundation
R
GA4-09
Amend GAL G-ree„ Sen -flea en 40R I r=nh.,.,npd CciR .tr-ntonn gni, stp-
&tiAFF
D
GA8-16
GA5-01
Amend CALGreen Section A5.106.4.1 Short Term Bicycle Parkin
R
GA9-16
GA5-02
Amend CALGreen Section A5.106.4.3 Changing Rooms
R
GA10-16
GA5-03
Amend CALGreen Section A5.106.6.1 Reducing Parking Capacity
R
CA5 04
n rend GAL r_.eeR SerAiO., A5.106.11.2 GaG Raaf
D
GA11-16
GA5-05
Amend CALGreen Section A5.406.1 Choice of Materials
R
FOOTNOTE:
1. R = Retain and update existing amendment, M = Modify existing amendment, D = Delete existing 2013 LARUCP amendment,
N = New amendment proposed.
2016 Edition of the California Building Code Page 106 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP GA1-16. Section A4.105.2 of the 2016 Edition of the California Green Building Standards
Code is amended to read as follows:
A4.105.2 Reuse of materials. Use salvaged, refurbished or reused materials for a minimum of 2.5
percent of the total value, based on estimated cost of materials on the proiect. Materials which can be
easily reused include but are not limited to the following:
1. Light fixtures.
2. Plumbing fixtures.
3. Doors and trim.
4. Masonry. (reused masonry may only be used for flatwork)
5. Electrical devices.
6. Appliances.
7. Foundations or portions of foundations.
Note: Reused material must be in compliance with the appropriate Title 24 requirements.
RATIONALE:
This section provides no guidelines for the percentage of materials to be recycled or reused to achieve
compliance with this section. The proposed editorial change provides a minimum percentage of material
that must be recycled or reused for the applicant to obtain compliance.
FINDINGS:
Local Administrative Finding — This amendment is necessary for administrative clarification. It does not
modify a Building Standards pursuant to Sections 17958 and 18941.5 of the California Health and Safety
Code and does not require an express finding to be made pursuant to Sections 17958.5 and 17958.7 of
the California Health and Safety Code. This amendment established administrative standards for the
effective enforcement of green building standards and therefore need to be incorporated into the code to
assure that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Green Building
Standards Code.
2016 Edition of the California Building Code Page 107 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP GA2-16. Section A4.106.5, Table A4.106.5.1(1), Table A4.106.5.1(2), Table
A4.106.5.1(3), and Table A4.106.5.1(4) of the 2016 Edition of the California Green Building Standards
Code are amended to read as follows:
A4.106.5 Cool roof for reduction of heat island effect. Roofing materials for Tier 1 and Tier 2 buildings
shall comply with this section:
TABLE A4.106.5.1(1)
TIER 1 - LOW-RISE RESIDENTIAL
TABLE A4.106.5.1(2)
TIER 2 - LOW-RISE RESIDENTIAL
MINIMUM 3 -YEAR
MINIMUM 3 -YEAR
ROOF GI=IMAT€
ROOF
CLIMATE
AGED SOLAR
THERMAL
SLOPE
ZONE
REFLECTANCE
EMITTANCE SRI
_< 2:12
13&15
0.63
0.75 75
> 2:12
44)--5
0.20
0.75 16
TABLE A4.106.5.1(2)
TIER 2 - LOW-RISE RESIDENTIAL
TABLE A4.106.5.1(3)
TIER 1 - HIGH-RISE RESIDENTIAL
BUILDINGS, HOTELS, AND MOTELS
MINIMUM 3 -YEAR
MINIMUM 3 -YEAR
ROOF GI=IMAT€
AGED SOLAR
THERMAL
SLOPE zON€
REFLECTANCE
EMITTANCE SRI
<_ 2:12 2-4,-6-15
&650.68
85 7882
> 2:12 2-,4,-6--4-5
0-.2-30.28
85 2827
TABLE A4.106.5.1(3)
TIER 1 - HIGH-RISE RESIDENTIAL
BUILDINGS, HOTELS, AND MOTELS
TABLE A4.106.5.1(4)
TIER 2 - HIGH-RISE RESIDENTIAL
BUILDINGS, HOTELS, AND MOTELS
MINIMUM 3 -YEAR
MINIMUM 3 -YEAR
ROOF C-1 'PRATE
AGED SOLAR
ROOF
Cl PAAT€
AGED SOLAR
THERMAL
_< 2:12 2_1A
SLOPE
z4WE
REFLECTANCE
EMITTANCE
SRI
< 2:12
O0 1�r,
, , , ,, , ,
�o
9550.63
0.75
6475
> 212
Z-4-5 1
0.20
0.75
16
TABLE A4.106.5.1(4)
TIER 2 - HIGH-RISE RESIDENTIAL
BUILDINGS, HOTELS, AND MOTELS
RATIONALE:
Tables A4.106.5.1.1, A4.106.5.1.2, A4.106.5.1.3 and A4.106.5.1.4 are indicating new values for Cool roof
rating. These new values for cool roof rating are higher than the standards being proposed by the
California Energy Commission and have been shown to be cost-effective through studies previously
2016 Edition of the California Building Code Page 108 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
MINIMUM 3 -YEAR
ROOF C-1 'PRATE
AGED SOLAR
THERMAL
SLOPE Z04€
REFLECTANCE
EMITTANCE SRI
_< 2:12 2_1A
9550.68
0a50.85 7982
> 2:12 2--4-5
9-2-30.28
&7-50.85 2-927
RATIONALE:
Tables A4.106.5.1.1, A4.106.5.1.2, A4.106.5.1.3 and A4.106.5.1.4 are indicating new values for Cool roof
rating. These new values for cool roof rating are higher than the standards being proposed by the
California Energy Commission and have been shown to be cost-effective through studies previously
2016 Edition of the California Building Code Page 108 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
conducted. Research has shown that the greater Los Angeles region suffers from heat island with the
temperature having increased as the region became more urban. The higher temperatures are closely
related to air pollution. Additionally, raising temperatures increase the overall and peak energy
consumption for cooling creating additional air pollution from the increased power production.
FINDINGS:
Local Environmental Condition — This amendment is necessary on the basis of a local environmental
condition. The greater Los Angeles region [OR NAME OF CITY OR REGION] is a densely populated area
where a majority of the building stocks are existing residential buildings. Existing dwellings have been
estimated to account for up to 40% of greenhouse gas emissions. This amendment offset this impact on
the communities by requiring addition or alteration to existing dwellings to comply with the CALGreen
Code. Any dwellings that require a permit to be issued will be required to comply with only those sections
that are relevant to the scope of work and thereby begin to contribute to improving the environment. This
amendment established more restrictive green building standards for improving the environment and
therefore need to be incorporated into the code to assure that new buildings and structures and additions
or alterations to existing buildings or structures are designed and constructed in accordance with the
scope and objectives of the California Green Building Standards Code.
2016 Edition of the California Building Code Page 109 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP GA3-16. Section A4.303.4 of the 2016 Edition of the California Green Building Standards
Code is amended to read as follows:
A4.303.4 Nonwater supplied urinals and composting toilets. Nonwater supplied urinals or composting
toilets are installed throughout the scope of the permit or comply with Sections 1101.1 thru 1101.8 of the
California Civil Code, whichever is the most restrictive.
Where approved, hybrid urinals, as defined in Chapter 2, shall be considered waterless urinals.
RATIONALE:
The proposed code does not stipulate the number of fixtures to be installed to achieve compliance. The
proposed editorial change clarifies the quantity of fixtures to be installed to comply with this code section.
FINDINGS:
Local Administrative Finding — This amendment is necessary for administrative clarification. It does not
modify a Building Standards pursuant to Sections 17958 and 18941.5 of the California Health and Safety
Code and does not require an express finding to be made pursuant to Sections 17958.5 and 17958.7 of
the California Health and Safety Code. This amendment established administrative standards for the
effective enforcement of green building standards and therefore need to be incorporated into the code to
assure that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Green Building
Standards Code.
2016 Edition of the California Building Code Page 110 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP GA4-16. Section A4.404.3 of the 2016 Edition of the California Green Building Standards
Code is amended to read as follows:
A4.404.3 Building systems. Use premanufactured building systems to eliminate solid sawn lumber
whenever possible. One or more of the following premanufactured building systems is used throughout:
1. Composite floor joist or premanufactured floor framing system
2. Composite roof rafters or premanufactured roof framing system
3. Panelized (SIPS, ICF or similar) wall framinig system
4. Other methods approved by the enforcing agency
RATIONALE:
The proposed code does not stipulate the amount of premanufactured components to be installed to
achieve compliance. The proposed editorial change clarifies the quantity to be installed to comply with
this code section.
FINDINGS:
Local Administrative Finding — This amendment is necessary for administrative clarification. It does not
modify a Building Standards pursuant to Sections 17958 and 18941.5 of the California Health and Safety
Code and does not require an express finding to be made pursuant to Sections 17958.5 and 17958.7 of
the California Health and Safety Code. This amendment established administrative standards for the
effective enforcement of green building standards and therefore need to be incorporated into the code to
assure that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Green Building
Standards Code.
2016 Edition of the California Building Code Page 111 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP GA5-16. Section A4.405.1 of the 2016 Edition of the California Green Building Standards
Code is amended to read as follows:
A4.405.1 Prefinished building materials. Utilize prefinished building materials which do not require
additional painting or staining when possible. One or more of the following building materials that do not
require additional resources for finishing are used:
1. Exterior trim not requiring paint or stain
2. Windows not requiring paint or stain
3. Siding or exterior wall coverings which do not require paint or stain
RATIONALE:
The application statement allows for the applicant to stipulate that pre -finished materials are not possible
and still achieve compliance with the requirement. The editorial change removes the condition and
requires compliance to achieve credit.
FINDINGS:
Local Administrative Finding — This amendment is necessary for administrative clarification. It does not
modify a Building Standards pursuant to Sections 17958 and 18941.5 of the California Health and Safety
Code and does not require an express finding to be made pursuant to Sections 17958.5 and 17958.7 of
the California Health and Safety Code. This amendment established administrative standards for the
effective enforcement of green building standards and therefore need to be incorporated into the code to
assure that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Green Building
Standards Code.
2016 Edition of the California Building Code Page 112 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP GA6-16. Section A4.405.4 of the 2016 Edition of the California Green Building Standards
Code is amended to read as follows:
A4.405.4 Use of building materials from rapidly renewable sources. One or more of the following
materials manufactured from rapidly renewable sources or agricultural by-products is used for a minimum
of 2.5 percent of the total value, based on estimated cost of materials on the proiect:
1. Insulation
2. Bamboo or cork
3. Engineered products
4. Agricultural based products
5. Other products acceptable to the enforcing agency
Note: The intent of this section is to utilize building materials and products which are typically
harvested within a 10 -year or shorter cycle
RATIONALE:
This section provides no guidelines for the percentage of materials to be used from rapidly renewable
sources. The proposed editorial change provides a minimum percentage of material from a rapidly
renewable source that must be use for the applicant to obtain compliance and receive credit.
FINDINGS:
Local Administrative Finding — This amendment is necessary for administrative clarification. It does not
modify a Building Standards pursuant to Sections 17958 and 18941.5 of the California Health and Safety
Code and does not require an express finding to be made pursuant to Sections 17958.5 and 17958.7 of
the California Health and Safety Code. This amendment established administrative standards for the
effective enforcement of green building standards and therefore need to be incorporated into the code to
assure that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Green Building
Standards Code.
2016 Edition of the California Building Code Page 113 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP GA7-16. Section A4.407.1 of the 2016 Edition of the California Green Building Standards
Code is amended to read as follows:
A4.407.1 Drainage around foundations. Install foundation and landscape drains which discharge to a
dry well, sump, bioswale or other approved on-site location except when not required by state code or
locally approved ordinance.
RATIONALE:
This section does not take into consideration the requirements of other codes or ordinances. The
proposed editorial change addresses the requirements of other codes or ordinances and eliminates an
applicant's ability to achieve credit while complying with the requirement of another code.
FINDINGS:
Local Administrative Finding — This amendment is necessary for administrative clarification. It does not
modify a Building Standards pursuant to Sections 17958 and 18941.5 of the California Health and Safety
Code and does not require an express finding to be made pursuant to Sections 17958.5 and 17958.7 of
the California Health and Safety Code. This amendment established administrative standards for the
effective enforcement of green building standards and therefore need to be incorporated into the code to
assure that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Green Building
Standards Code.
2016 Edition of the California Building Code Page 114 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP GA8-16. Section A5.106.4.1 of the 2016 Edition of the California Green Building
Standards Code is amended to read as follows:
A5.106.4.1 Rese:Ted.Short-term bicycle parking. If the project is anticipated to generate visitor traffic,
provide permanently anchored bicycle racks within 200 feet of the visitors' entrance, readily visible to
Passers-by, for 15 percent of visitor motorized vehicle parking capacity, with a minimum of one two -bike
capacity rack.
RATIONALE:
This section for bicycle parking only requires 5 percent of the motorized vehicle parking capacity which is
equal to mandatory requirement in section 5.106.4.1. The editorial change to 15 percent increases the
requirement and removes an applicant's ability to obtain compliance in two different sections.
FINDINGS:
Local Environmental Conditions — This amendment is necessary on the basis of a local environmental
condition. The greater Los Angeles region [OR NAME OF CITY OR REGION] is a densely populated area
having congested streets and highways that results in increased atmospheric pollutions from active and
idle vehicles. The proposed modification to increase other alternative means of transportation that is more
environmental friendly will reduce both traffic and pollution to the region and promote healthier living and
therefore need to be incorporated into the code to assure that new buildings and structures and additions
or alterations to existing buildings or structures are designed and constructed in accordance with the
scope and objectives of the California Green Building Standards Code.
2016 Edition of the California Building Code Page 115 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP GAS -16. Table A5.106.4.3 of the 2016 Edition of the California Green Building Standards
Code is amended to read as follows:
A5.106.4.3 Changing rooms. For buildings with over 10 tenant -occupants, provide changing/shower
facilities for tenant -occupants only in accordance with Table A5.106.4.3 or document arrangements with
nearby changing/shower facilities.
TABLE A5.106.4.3
NUMBER OF
2 -TIER (12" X 15" X 72")
TENANT-
SHOWER/CHANGING
PERSONAL EFFECTS
OCCUPANTS
FACILITIES REQUIRED
LOCKERS''2 REQUIRED
0-10
81 unisex shower
81
11-50
1 unisex shower
2
51-100
1 unisex shower
3
101-200
1 shower stall per gender
4
1 shower stall per gender for
One 2 -tier locker for each
Over 200
each 200 additional tenant-
50 additional tenant -
occupants
occupants
Note: Additional information on recommended bicycle accommodations may be obtained
from Sacramento Area Bicycle Advocates
RATIONALE:
This table permits an applicant can obtain credit for installing zero changing rooms. By modifying the
requirement in the table, an applicant is required to install at least one changing room to receive credit for
this section.
FINDINGS:
Local Administrative Finding — This amendment is necessary for administrative clarification. It does not
modify a Building Standards pursuant to Sections 17958 and 18941.5 of the California Health and Safety
Code and does not require an express finding to be made pursuant to Sections 17958.5 and 17958.7 of
the California Health and Safety Code. This amendment established administrative standards for the
effective enforcement of green building standards and therefore need to be incorporated into the code to
assure that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Green Building
Standards Code.
2016 Edition of the California Building Code Page 116 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP GA10-16. Section A5.106.6.1 of the 2016 Edition of the California Green Building
Standards Code is amended to read as follows:
A5.106.6.1 Reduce parking capacity. With the approval of the enforcement authority, employ strategies
to reduce on-site parking area by 20 percent by
1. Use of on street parking or compact spaces, illustrated on the site plan or
2. Implementation and documentation of programs that encourage occupants to carpool, ride share
or use alternate transportation.
Note: Strategies for programs may be obtained from local TMAs.
RATIONALE:
This section does not establish a minimum number of reduced parking spaces to achieve compliance,
only that the local authority approves the proposed reduction. The editorial change establishes a
minimum percentage to achieve a credit for this section.
FINDINGS:
Local Environmental Conditions — This amendment is necessary on the basis of a local environmental
condition. The greater Los Angeles region [OR NAME OF CITY OR REGION] is a densely populated area
having congested streets and highways that results in increased atmospheric pollutions from active and
idle vehicles. The proposed modification to increase other alternative means of transportation that is more
environmental friendly will reduce both traffic and pollution to the region and promote healthier living and
therefore need to be incorporated into the code to assure that new buildings and structures and additions
or alterations to existing buildings or structures are designed and constructed in accordance with the
scope and objectives of the California Green Building Standards Code.
2016 Edition of the California Building Code Page 117 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
2016 EDITION OF THE LOS ANGELES REGION UNIFORM CODE PROGRAM
2016 LARUCP GA11-16. Section A5.406.1 of the 2016 Edition of the California Green Building
Standards Code is amended to read as follows:
A6.406.1 Choice of materials. Compared to other products in a given product category, choose
materials proven to be characterized by one or more of the following for a minimum of 5 percent of the
total value, based on estimated cost of materials on the project.
RATIONALE:
This section does not provide any guidelines for a quantity of materials to achieve compliance. The
editorial change establishes a minimum percentage for the different categories located within this section.
FINDINGS:
Local Administrative Finding — This amendment is necessary for administrative clarification. It does not
modify a Building Standards pursuant to Sections 17958 and 18941.5 of the California Health and Safety
Code and does not require an express finding to be made pursuant to Sections 17958.5 and 17958.7 of
the California Health and Safety Code. This amendment established administrative standards for the
effective enforcement of green building standards and therefore need to be incorporated into the code to
assure that new buildings and structures and additions or alterations to existing buildings or structures are
designed and constructed in accordance with the scope and objectives of the California Green Building
Standards Code.
2016 Edition of the California Building Code Page 118 of 118
2016 Edition of the California Residential Code Final Version: 08/05/2016
2016 Edition of the California Green Building Standards Code Updated Version: 08/23/2016
fi220 TLEE TOOD
r