HomeMy Public PortalAboutOrdinance No. 921-01 12-11-2001 • ORDINANCE NO. 921-01;
AN ORDINANCE OF THE CITY OF RICHLAND HILLS ADOPTING THE
2000 EDITION OF THE INTERNATIONAL RESIDENTIAL CODE, AND
LOCAL AMENDMENTS; AMENDING SECTION 14-76 OF THE CITY
CODE BY ADOPTING THE 1999 EDITION OF THE NATIONAL
ELECTRICAL CODE, AMENDING SECTION 14-77 OF THE CITY CODE
BY ADOPTING LOCAL AMENDMENTS TO THE 1999 EDITION OF THE
NATIONAL ELECTRIC CODE; ADOPTING THE 2000 EDITION OF THE
INTERNATIONAL ENERGY CONSERVATION CODE, AND LOCAL
AMENDMENTS; PROVIDING FOR THE MODIFICATION OF THE
CODES TO INCORPORATE LOCAL AMENDMENTS; PROVIDING FOR
RECORDING OF THE CODES AS A PUBLIC' RECORD; PROVIDING
THAT THIS ORDINANCE SHALL BE CUMULATIVE OF ALL
ORDINANCES; PROVIDING A SEVERABILITY CLAUSE; PROVIDING
FOR A PENALTY FOR VIOLATIONS; PROVIDING A SAVINGS CLAUSE;
PROVIDING FOR PUBLICATION IN PAMPHLET FORM; PROVIDING
FOR PUBLICATION IN THE OFFICIAL NEWSPAPER; AND PROVIDING
AN EFFECTIVE DATE.
WHEREAS, the City of Richland Hills is a home rule city acting under its charter adopted
by the electorate pursuant to Article XI, Section 5 of the Texas Constitution and Chapter 9 of the
• Local Government Code; and
WHEREAS, the 2001 Texas Legislature in Senate Bill 365 amended Chapter 214 of the
Local Government Code by adopting the International Residential Code and the National Electrical
Code as the 1Vlunicipal Residential Building Code and Residential Electrical Construction Code in
the State applying to all residential construction applications after January 1, 2002; and
WHEREAS, the 2001 Texas Legislature in Senate Bill 5 adopted the International Energy
Conservation Code as the Energy Code of the State after September 1, 2002; and
WHEREAS, the City Council of the City of Richland Hills desires to adopt the International
Residential Code, the National Electrical Code, and the International Energy Conservation Code in
compliance with the legislative mandates referenced above; and
WHEREAS, the City Council of the City of Richland Hills desires to provide a mechanism
by which local modifications reflecting the unique needs of the City of Richland Hills may be made
when deemed appropriate.
•
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• NOW, THEREFORE, BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF
RICHLAND HILLS, TEXAS:
SECTION 1.
Chapter 14 of the Richland Hills Code of Ordinances is amended by the addition of a new
Article X, Section 14-400, which shall read as follows:
"The 2000 Edition of the International Residential Code is hereby adopted as
the official residential building code of the City of Richland Hills, Texas. This
residential code is fully incorporated by reference as though copied into this Code in
its entirety. The material contained in the International Residential Code shall not be
included in the formal municipal codification of ordinances but shall be maintained
as a public record in the office of the City Secretary and will be available for public
inspection and copying during regular business hours."
SECTION 2.
Chapter 14 of the Richland Hills Code of Ordinances is amended by the addition of a new
Article X, Section 14-401, which shall read as follows:
"The 2000 Edition of the International Residential Code, as adopted herein
is hereby amended. The amendments, although fully adopted and incorporated by
• reference, shall not be included in the formal municipal codification of ordinances.
The amendments shall instead by maintained as a public record in the office of the
City Secretary and the Building inspector. These exhibits will be available for public
inspection and copying during regular business hours."
SECTION 3.
A copy of the amendments to the 2000 Edition of the International Residential Code adopted
by the City are attached hereto as Exhibit A.
SECTION 4.
Section 14-76 of Chapter 14 of the Richland Hills Code of Ordinances is amended to read
as follows:
"The 1999 Edition of the National Electrical Code is hereby adopted as the
official electrical code of the City of Richland Hills, 'Texas. This electrical code is
fully incorporated by reference as though copied into this ordinance in its entirety.
The material contained in the National Electrical Code shall not be included in the
formal municipal codification of ordinances but shall be maintained as a public
record in the office of the City Secretary and will be available for public inspection
and copying during regular business hours."
•
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• SECTION 5.
Section 14-77 of Chapter 14 of the Richland Hills Code of Ordinances is amended to read
as follows:
"The 1999 Edition of the National Electrical Code, as adopted herein is
hereby amended. The amendments, although fully adopted and incorporated by
reference, shall not be included in the formal municipal codification of ordinances.
The amendments shall instead by maintained as a public record in the office of the
City Secretary and the Building inspector. These exhibits will be available for public
inspection and copying during regular business hours."
SECTION 6.
A copy of the amendments to the 1999 Edition of the National Electrical Code adopted by
the City are attached hereto as Exhibit B.
SECTION 7.
Chapter 14 of the Richland Hills Code of Ordinances is amended by the addition of a new
Article XI, Section 14-420, which shall read as follows:
"The 2000 Edition of the International Energy Conservation Code is hereby
• adopted as the official energy conservation code of the City of Richland Hills, Texas.
This energy conservation code is fully incorporated by reference as though copied
into this ordinance in its entirety. The material contained in the International Energy
Conservation Code shall not be included in the formal municipal codification of
ordinances but shall be maintained as a public record in the office of the City
Secretary and will be available for public inspection and copying during regular
business hours."
SECTION 8.
Chapter 14 of the Richland Hills Code of Ordinances is amended by the addition of a new
Article XI, Section 14-420, which shall read as follows:
"The 2000 Edition of the International Energy Conservation Code, adopted
herein, is hereby amended. The amendments, although fully adopted and
incorporated by reference, shall not be included in the formal municipal codification
of ordinances. The amendments shall instead by maintained as a public record in the
office of the City Secretary and the Building inspector. These exhibits will be
available for public inspection and copying during regular business hours."
•
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• SECTION 9.
A copy of the amendments to the 2000 Edition of the International Energy Conservation
Code adopted by the City are attached hereto as Exhibit C.
SECTION 10.
The material contained in Exhibits A through C to this ordinance, although fully adopted and
incorporated by reference, shall not be included in the formal municipal codification of ordinances.
The material contained in Exhibits A through C shall instead by maintained as a public record in the
office of the City Secretary and the Building inspector. These exhibits will be available for public
inspection and copying during regular business hours. The purpose of maintaining these records
separate and apart from the municipal codification is to avoid the inclusion of detailed technical
construction materials, subject to frequent change, which would unreasonably lengthen the code.
SECTION 11.
The City of Richland Hills may from time to time determine that additional local
modifications to the codes adopted herein are necessary and appropriate to meet the unique building
needs of the City of Richland Hills. To effectuate modifications, the city council may enact
individual ordinances amending this ordinance fully setting forth the change to be made in the
specific code. Such subsequent amendments shall be consolidated as an exhibit to this ordinance,
and shall be maintained as a public record in the office of the city secretary.
• SECTION 12.
This Ordinance shall be cumulative of all provisions of ordinances and of the Code of
Ordinances of the City of Richland Hills, Texas, as amended, except where the provisions of this
ordinance are in direct conflict with the provisions of such ordinances and such code, in which event
the conflicting provisions of such ordinances and such Code are hereby repealed.
SECTION 13.
It is hereby declared to be the intention of the City Council that the phrases, clauses,
sentences, paragraphs and sections of this Ordinance are severable, and if any phrase, clause,
sentence, paragraph or section of this Ordinance shall be declared unconstitutional by the valid
judgment or decree of any court of competent jurisdiction, such unconstitutionality shall not affect
any of the remaining, phrase, clauses, sentences, paragraphs or sections of this Ordinance since the
same would have been enacted by the City Council without incorporation in this Ordinance of any
such unconstitutional phrase, clause, sentence, paragraph or section.
SECTION 14.
Any person, firm or corporation who violates, disobeys, omits, neglects or refuses to comply
with or who resists the enforcement of any of the provisions of this Ordinance shall be fined no more
• than Two Thousand Dollars ($2,000.00) for all violations involving zoning, fire safety or public
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health and sanitation, including dumping or refuse, and shall be fined not more than Five Hundred
• Dollars ($500.00) for all other violations of this Ordinance. Each day that a violation is permitted
to exist shall constitute a separate offense.
SECTION 15.
All rights and remedies of the City of Richland Hills, Texas, are expressly saved as to any
and all violations of the provisions of the Building Code, Electrical Code, Energy Code or any other
ordinances affecting such codes which have accrued at the time of the effective date of this
Ordinance; and, as to such accrued violations and all pending litigation, both civil and criminal,
whether pending in court or not, under such ordinances same shall not be affected by this Ordinance
but maybe prosecuted until final disposition by the courts.
SECTION 16.
The City Secretary of the City of Richland Hills is directed to publish the caption, penalty
clause, publication clause and effective date of this Ordinance in one issue of the official city
newspaper as authorized by Section 52.013 of the Local Government Code.
SECTION 17.
The City Secretary of the City of Richland Hills is hereby authorized to publish this
ordinance and the exhibits to this ordinance in book or pamphlet form for general distribution among
the public, and the operative provisions of this ordinance and the exhibits to this ordinance as so
published shall be admissible in evidence in all courts without further proof than the production
thereof.
SECTION 18.
This Ordinance shall be in full force and effect form and after its passage and publication as
provided by law, and it is so ordained.
PASSED AND APPROVED ON THIS 11t1~AY OF Decealber , 2001.
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C. F. KE LEY, MAYOR ~l C~
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• APP VE
Tim G. Sralla, City Attorney
TAYLOR, OLSON, ADKINS, SRALLA & SLAM, L.L.P.
6000 Western Place, Suite 200
Fort Worth, Texas 76107
Telephone: (817) 332.2580
Fax: (817) 332.4740
•
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• Recommended Amendments to the
2000 International Residential Code
North Central Texas Council of Governments region
**Section R102.4; change to read as follows:
R102.4 Referenced codes and standards. The codes when specifically adopted, and standards
referenced in this code shall be considered part of the requirements of this code to the prescribed extent
of each such reference. Whenever amendments have been adopted to the referenced codes and
standards. each reference to said code and standard shall be considered to reference the amendments
as well. Any reference made to NFPA 70 or the ICC Electrical Code shall mean the Electrical Code as
adopted.
Where differences occur between provisions of this code and referenced codes and standards, the
provisions of this code shall apply.
Exception: Where enforcement ...{remainder of exception unchanged.}... .
(Reason: Legal wording to recognize locally adopted codes and amendments adopted with referenced
codes.)
**Section R105.2, item #1; change as follows:
1. One-story detached accessory structures, provided the floor area does not exceed X89 120
• square feet (a-I~-~ 11.15 m2).
(Reason: Change corresponds to unamended IBC Section 105.2.)
**Section R109.1.3; change to read as follows:
R109.1.3 Floodplain inspections. For construction permitted in areas prone to flooding as established
by Table R301.2(1), upon {bulk of section unchanged} ...construction, the building official may sk?all
require submission {remainder of section unchanged}.
(Reason: Confirmation of elevation is left to local discretion.)
**Section R110 (R110.1 through R110.4); delete.
(Reason: Issuing CO's for residences is not a common practice in the area.)
"*Section R112.2.2; delete.
(Reason: Floodplain provisions are addressed locally.)
•
North Central Texas 1 February 2001
2000 IRC amendments
• **Section R202; change definition of "Townhouse" to read as follows:
TOWNHOUSE. Asingle-family dwelling unit constructed in a group of attached units
separated by property lines in which each unit extends from foundation to roof and with open space on at
least two sides.
(Reason: Consistent with terminology commonly used in this region.)
**Table R301.2(1); fill in as follows:
Roof Wind Seismic
Snow Design
Load Speede (mph) Category`~9
5 Ib/ft 90 (3-sec-gust)/75 fastest mile A
Subject to damage from Winter
Frost line Design Flood h
Weatheringa depthb Termite° Decays Temp Hazards
slight to local
moderate 6" very heavy moderate 22° F code
**SectionR302.1; add a second exception as follows:
Exceptions:
1. Tool and storage sheds, playhouses and similar structures exempted from permits by Section
R105.2 are not required to provide wall protection based on location on the lot. Projections
beyond the exterior wall shall not extend over the lot line.
2. Open metal carport structures may be constructed within zero (0) feet of the property line
without fire-resistive or opening protection when the location of such is approved as required
by other adopted ordinances.
(Reason: Refers to other ordinances, such as zoning ordinances.)
**Section R303.3, exception; change to read as follows:
Exception: The glazed areas shall not be required where artificial light and a mechanical ventilation
system complying with one of the following, are provided.
1. The minimum ventilation rates shall be 50 cfm (23.6 L/s) for intermittent ventilation or 20 cfm
(9.4 L/s) for continuous ventilation. Ventilation air from the space shall be exhausted directly
to the outside.
2. Bathrooms that contain only a water closet lavatory or combination thereof may be ventilated
with an approved mechanical recirculating fan or similar device designed to remove odors
from the air.
(Reason: Consistent with common local practice.)
•
North Central Texas 2 February 2001
2000 IRC amendments
• **Section R303.6; change to read as follows:
R303.6 Required heating. a~
~1-6eG}-eve+~ Every dwelling unit shall be provided with heating facilities capable of maintaining a
minimum room temperature of 68°F (20°C) at a point 3 feet (914 mm) above the floor and 2 feet (610 mm)
from exterior walls in all habitable rooms at the design temperature.
(Reason: Specifies requirement for this area.)
**Section R314.8; change to read as follows:
R314.8 Under stair protection. Enclosed accessible space under stairs shall have walls, under stair
surface and any soffits protected on the enclosed side with 5/8-inch (15.8 mm) fire-rated ' ~~-~-T
rte-) gypsum board or one-hour fire-resistive construction.
(Reason: Represents the standard protection method used in this area.)
**Section R321.1; add a second exception to read as follows:
Exceptions:
1. {existing exception unchanged}
2. Two-family dwelling units that are also divided by a property line through the structure shall be
separated as required for townhouses.
(Reason: Provide guidance for a common construction method in this area. Correlates with amendment
• to IRC Section R202 Townhouse definition.)
**Section R322.1; change to read as follows:
R322.1 Moisture control. In all framed walls, floors and roof/ceilings comprising elements of the building
thermal envelope, a vapor retarders when installed, shall be installed in a manner so as to not trap
moisture
(delete the exceptions)
(Reason: This eliminates the requirement of a vapor retarder throughout the NCTCOG region, while
giving reasonable guidance if a vapor retarder is installed. Eliminating vapor retarders in hot and humid
climate zones is consistent with the recommendation of most building scientists.)
**Section R327.1; change fo read as follows:
R327.1 General. All buildings and structures, when permitted to be erected in areas prone to flooding .
{bulk of section unchanged} ...areas (including V-Zones), shall be constructed and elevated as required
by the provisions contained in this section or by other local provisions as applicable.
(Reason: Recognize other local provisions.)
•
North Central Texas 3 February 2001
2000 IRC amendments
• **Section R703.7.4.1; add a second paragraph to read as follows:
For 3'/< square feet (0.302 m2) of wall area, the following dimensions shall be adhered to:
1. When ties are placed on studs 16" o.c., they shall be spaced no further apart than 29" vertically
starting approximately 15" from the foundation.
2. When ties are placed on studs 24" o.c., they shall be spaced no further apart than 19" vertically
starting approximately 10" from the foundation.
(Reason: Provide easy to install and inspect dimensions for clarity.)
'`'`Section R703.7.4.2; add a second paragraph to read as follows:
When using ties that will flex when pushed, spot bedding of cement mortar shall be installed on
all ties.
(Reason: To prevent masonry veneer walls from having movement when pushed upon.)
"*Add Section R902.3 to read as follows:
R902.3 Minimum Roof Class. All roof coverings shall be a minimum Class C. All individual replacement
shingles or shakes shall be a minimum Class C.
Exception: Non-classified roof coverings shall be permitted on buildings of U occupancies
having not more than 120 sg.ft. of projected roof area. When exceeding 120 sg.ft. of projected
• roof area, buildings of U occupancies may use non-rated non-combustible coverings.
(Reason: Consistent with local practice.)
**Section R907.1; add a sentence to read as follows:
All individual replacement shingles or shakes shall comply with Section R902.3.
(Reason: Consistent with local practice. Correlates with regional amendment to R902.3.)
**Section R1005.2; changed to read as follows:
R1005.2 Exterior air intake. The exterior air intake shall be capable of providing all combustion air from
the exterior of the dwelling or from spaces within the dwelling ventilated with outside air such as crawl-er
attic spaces. The {remainder of section unchanged}.
(Reason: Problems have arisen with using crawl space ventilation.)
•
North Central Texas 4 February 2001
2000 IRC amendments
• **Section N1101.2; amend as follows:
N1101.2.1 Residential Buildings, Type A-1. Compliance shall be demonstrated by-ei#f~er one of the
following:
1. Meeting the requirements of this chapter for buildings with a glazing area that does not exceed 15
percent of the gross area of exterior walls; er
2. Meeting the requirements of this chapter for buildings with a glazing area that is greater than 15
percent but not exceeding 20 percent of the gross area of exterior walls and air conditioning
equipment rated 12 SEER or higher;
3. Meeting the requirements of this chapter for buildings with a glazing area that is greater than 20
percent but not exceeding 25 percent of the gross area of exterior walls and air conditioning
equipment rated 14 SEER or higher; or
4. Meeting the requirements of the International Energy Conservation Code for residential buildings,
Type A-1.
(Reason: This amendment would increase the number of builders who could use this "simplified
prescriptive" approach of the IRC. It accommodates particularly the move-up and luxury homes with
large glazing areas. The trade-off with air-conditioning is an option under the IECC systems analysis or
MECcheck approach, and is brought into this format for convenience only. Other IECC trade-offs would
also remain available. The intent is to maintain compatibility with the IECC. The intent would include
adjustment of this provision at such future date that the minimum federal equipment standards are raised
to achieve equivalent increases in energy savings.)
**Add Section N1101.3.4 to read as follows:
• N1101.3.4 Exterior basement or slab insulation. When susceptibility to termite damage is classified as
"very heavy" according to Table R301.2(1) designs employing basement or slab exterior insulation
capable of harboring termites shall not be utilized.
(Reason: Usage of exterior insulation provides access for termites. This amendment does not preclude
the use of insulating coatings that do not provide termite access or shelter.)
**Section N1102.1 amend as follows:
N1102.1 Thermal performance criteria. The minimum required insulation R-value or maximum required
U-factor for each element in the building thermal envelope (fenestration, roof/ceiling, opaque wall, floor,
slab edge, crawl space wall and basement wall) shall be in accordance with the criteria in Table
. N1102.1.
Residential building, Type A-1, with greater than 45-25-percent glazing area; residential buildings, Type
A-2, with greater than 25-percent glazing area; and any building in climates with HDD equal to or greater
than 13,000; shall determine compliance using the building envelope requirements of the International
Energy Conservation Code.
(Reason: This amendment corrects an error in the section and is compatible with the previous
amendment increasing allowable glazing area, effectively increasing the number of builders who could
use the "simplified prescriptive" approach of the IRC.)
•
North Central Texas 5 February 2001
2000 IRC amendments
• **Rep/ace Table N1102.1 with:
TABLE N1102.1
SIMPLIFIED PRESCRIPTIVE BUILDING ENVELOPE THERMAL COMPONENT CRITERIA
MINIMUM REQUIRED THERMAL PERFORMANCE (U-FACTOR AND R-VALUE)
MINIMUM INSULATION R-VALUE [(heft ~ F)/Btu]
MAXIMUM Ceilings Ceiling
GLAZING open to Joist/Roof Walls Floors Basement Slab Crawl
U-FACTOR Attic Rafter Walls perimeter space
[Btu/(hr•ftz~ F)] Space Assembly walls
0.65 R-38 R-22 R-13 R-19 R-0 R-0 R-0
(Reason: This amendment is compatible with the previous amendments increasing the number of
builders who could use the "simplified prescriptive" approach of the IRC and incorporates the Home
Builder Association prescriptive package proposal. The addition of "Ceiling Joist/Roof Rafter Assembly"
requirements protect such assemblies from the damage likely to occur if greater amounts of insulation
were attempted in such assemblies.)
Section N1102.2 amend as follows:
N1102.2 Maximum solar heat gain coefficient for fenestration products. The area-weighted-
average solar heat gain coefficient (SHGC) for glazed fenestration installed in climate zones'
°T-a.,d-'~~
~cn-with less than 3,500 HDD;shall not exceed 0.40.
(Reason: This amendment corrects a printing error in the IRC and avoids confusion over the intent to
• maintain consistency with requirements of the IECC.)
**Add Section M1304.2 to read as follows:
M1304.2 Minimum burial depth. Underground fuel piping systems shall be installed a minimum depth
of 18 inches (458 mm) below grade.
(Reason: To provide increased protection to piping systems.)
**Section M1305.1.3; change to read as follows:
M1305.1.3 Appliances in attics. Attics containing appliances requiring access shall be provided .
{bulk of paragraph unchanged} ...sides of the appliance where access is required. The clear access
opening dimensions shall be a minimum of 20 inches by 30 inches (508 mm by 762 mm), or larger where
such dimensions are not large enough to allow removal of the largest appliance. As a minimum, access
to the attic space shall be provided by one of the following:
1. A permanent stair.
2. A pull down stair.
3. An access door from an upper floor level.
Exception: The passageway and level service space are not required where the appliance is
capable of being serviced and removed through the required opening.
• (Reason: To provide a safe means of accessibility to appliances in attics.)
North Central Texas 6 February 2001
2000 IRC amendments
• **Add Section M1305.1.5, M1305.1.5.1 to read as follows:
M1305.1.5 Water heaters above ground or floor. When the mezzanine or platform in which a water
heater is installed is more than eight (8) feet (2438 mm) above the ground or floor level, it shall be made
accessible by a stairway or permanent ladder fastened to the building.
M1305.1.5.1 Whenever the mezzanine or platform is not adequately lighted or access to a
receptacle outlet is not obtainable from the main level, lighting and a receptacle outlet shall be
provided in accordance with Section M1305.1.3.1.
(Reason: To provide safe access to water heaters and to provide lighting and receptacle for maintenance
of equipment.)
**Section M1305.1.3.1; add a sentence to read as follows:
Low voltage wiring of 50 Volts or less shall be installed in a manner to prevent physical damage.
(Reason: To call attention to the need for care while installing lighting wiring in attic.)
**Section M1305.1.4.1; change to read as follows:
M1305.1.4.1 Ground clearance. Appliances supported from the ground shall be level and firmly
supported on a concrete slab or other approved material extending above the adjoining grade a minimum
of 3 inches (76 mm). Appliances suspended from the floor shall have a clearance of not less than 6
inches (152 mm) above the ground.
• (Reason: Consistent with current local practice.)
**Section M1305.1.4.3; add a sentence to read as follows:
Low voltage wiring of 50 Volts or less shall be installed in a manner to prevent physical damage.
(Reason: To call attention to the need for care while installing lighting wiring under floors.)
**Section M1307.3.1; delete.
(Reason: This provision does not reflect standard practice in this area.)
**Section M1501.2; change to read as follows:
M1501.2 Exhaust duct size. The minimum diameter of the exhaust duct shall be as recommended by
the manufacturer ar~d shall be at least the diameter of the appliance outlet and shall be a minimum
nominal size of 4 inches (102 mm) in diameter. The size of duct shall not be reduced along its developed
length nor at the point of termination.
(Reason: To clarify the size requirement.)
•
North Central Texas 7 February 2001
2000 IRC amendments
. "*Section M1501.3; change to read as follows:
M1501.3 Length limitation. The maximum length of a clothes dryer exhaust duct shall not exceed 25
feet (7620 mm) from the dryer location to the wall or roof termination with not more than two bends.
When extra bends are installed, the maximum length of the duct shall be reduced 2.5 feet (762 mm) for
each 45-degree (0.79 rad) bend and 5 feet (1524 mm) for each 90-degree (1.6 rad) bend that occur after
the first two bends, measuring in the direction of airflow. The maximum length of the exhaust duct does
not include the transition duct.
{Exception is unchanged}
(Reason: To make more consistent with regional practice. Dryer technology has improved to the point
where they should be capable of handling this.)
""Section M1601.3.4, item #1; change to read as follows:
1. Duct insulation shall conform to the requirements of Table M1601.3.4 and Section N1101.2. Should
there be any conflicts between this section and the energy efficiency provisions, the energy efficiency
provisions shall take precedence.
A vapor retarder in accordance with Table M1601.3.4
r~.Ql~~~~ , or aluminum foil having a minimum thickness of
2 mils (0.051 mm), shall be installed on the exterior of insulation on cooling supply ducts that pass
through nonconditioned spaces conducive to condensation.
Insulations having a permeance of 0.05 perms (2.87 nq/(Pa s m2)1 or less shall not be required to
• be covered.
(Reason: To indicate presiding code and reference to Table M1601.3.4. See next amendment.)
**Add Table M1601.3.4 to read as follows:
Table M1601.3.4 -Insulation of Ducts
Insulation Types Insulation
Duct Location Mechanically Heating Zone' Types
Cooled Heating Only
I A and W
On roof on exterior of building C, VZ and W II Band W
III C and W
I A
Attics, garages and crawl spaces A and VZ II A
III B
I A
In walls3, within floor-ceiling spaces3 A and VZ II A
III B
Within the conditioned space or in None required None required
basements; return ducts in air plenums
• Cement slab or within ground None required None required
North Central Texas 8 February 2001
2000 IRC amendments
Note: Where ducts are used for both heating and cooling, the minimum insulation shall be as required for
the most restrictive condition.
Heating Degree Days:
Zone I below 4,500 D.D.
Zone II 4,501 to 8,000 D.D.
Zone III over 8,000 D.D.
z Vapor retarders shall be installed on supply ducts in spaces vented to the outside in geographic areas
where the summer dew point temperature based on the 2 '/z percent column of dry-bulb and mean
coincident wet-bulb temperature exceeds 60° F. (15.4° C).
s Insulation may be omitted on that portion of a duct which is located within awall- or afloor-ceiling space
where:
3'1 Both sides of the space are exposed to conditioned air.
sz The space is not ventilated.
s.s The space is not used as a return plenum.
s.a The space is not exposed to unconditioned air.
Ceilings which form plenums need not be insulated.
INSULATION TYPES4
A A material with an installed conductance of 0.48 [2.72 W/(m*K)] or the equivalent thermal
resistance of 2.1 [0.367 (m"K)/W].
Example of materials capable of meeting the above requirements:
1-inch (25 mm), 0.60 Ib./cu.ft. (9.6 kg/m) mineral fiber, rock, slag or glass blankets.
%2-inch (13 mm), 1.5 to 3 Ib./cu.ft. (24 to 48 kg/m3) mineral fiber blanket duct liner.
-inch (13 mm), 3 to 10 Ib./cu.ft. (48 to 160 kg/m3) mineral fiber board.
B A material with an installed conductance of 0.24 [1.36 W/(m"K)] or the equivalent thermal
resistance of 4.2 [0.735 (m*K)/W].
Example of materials capable of meeting the above requirements:
2-inch (51 mm), 0.60 Ib./cu.ft. (9.6 kg/m) mineral fiber blankets.
1-inch (25 mm), 1.5 to 3 Ib./cu.ft. (24 to 48 kg/m3) mineral fiber blanket duct liner.
1-inch (25 mm), 3 to 10 Ib./cu.ft. (48 to 160 kg/m3) mineral fiber board.
C A material with an installed conductance of 0.16 [0.9 W/(m`K)] or the equivalent thermal
resistance of 6.3 [1.1 (m`K)/W].
Example of materials capable of meeting the above requirements:
3-inch (76 mm), 0.60 Ib./cu.ft. (9.6 kg/m) mineral fiber blankets.
1 '/z-inch (38 mm), 1.5 to 3 Ib./cu.ft. (24 to 48 kg/m3) mineral fiber blanket duct liner.
1 %-inch (38 mm), 3 to 10 Ib./cu.ft. (48 to 160 kg/m3) mineral fiber board.
V --Vapor Retarders: Material with a perm rating not exceeding 0.05 perm [29 ng/Pa"s"mz]. All joints
to be sealed.
W -Approved weatherproof barrier.
' The example of materials listed under each type is not meant to limit other available thickness and
density combinations with the equivalent installed conductance or resistance based on the insulation
only.
(Reason: To reduce heating and/or cooling energy duct losses.)
**Section M2005.2; change to read as follows:
M2005.2 Prohibited locations. Fuel-fired water heaters shall not be installed in a room used as a
storage closet. Water heaters located in a bedroom or bathroom shall be installed in a sealed enclosure
so that combustion air will not be taken from the living space. Access to such enclosure may be from the
bedroom or bathroom when through a solid door weather-stripped in accordance with the exterior door
air leakage requirements of the International Energy Conservation Code and equipped with an approved
self-closing device. Direct-vent water heaters are not required to be installed within an enclosure.
(Reason: Corresponds with the provisions of IFGC Section 303, exception #5.)
North Central Texas 9 February 2001
2000 IRC amendments
• Section G2403; amend definition of "Unvented Room Heater" to add a sentence to read as
follows:
For the purpose of installation this definition shall also include "Unvented Decorative Appliances."
(Reason: Clarifies installation for these devices.)
**Section G2407.15, item #1; change the exception to read as follows:
Exception: Unobstructed stud and joist spaces within dwelling units shall not be prohibited from
conveying combustion air, provided that not more than one required fireblock is removed.
(Reason: Match wording in unamended IFGC Section 304.15 and to insure that shared walls between
dwelling units are not used as plenums.)
**Section G2408.3; delete.
(Reason: This provision does not reflect standard practice in this area.)
**Section G2411.5; add a second paragraph to read as follows:
Both ends of each section of medium pressure corrugated stainless steel tubing (CSST) shall
identify its operating gas pressure with an approved tag The tags are to be composed of aluminum or
• stainless steel and the following wording shall be stamped into the tag:
"WARNING
1/2 to 5 psi gas pressure
Do Not Remove"
(Reason: To protect homeowners and plumbers.)
**Section G2412.3; add an exception to read as follows:
Exception• Corrugated stainless steel tubing {CSST) shall be a minimum of 1/2".
(Reason: Pipe less than 1/2" has a history in this region of causing whistling.)
**Section G2414.6; change to read as follows:
G2424.6 (404.6) Piping in solid floors. Piping in solid floors shall be laid in channels in the floor and
covered in a manner what will allow access to the piping with a minimum amount of damage to the
building. Where such piping is subject to exposure to excessive moisture or corrosive substances, the
piping shall be protected in an approved manner. As an alternative to installation in channels, the piping
shall be installed in accordance with Section G2414.11 (404.11) ,
(Reason: Referencing Section G2414.11 provides CSST piping with outside venting.)
•
North Central Texas 10 February 2001
2000 IRC amendments
• *"Section G2414.9; change to read as follows:
G2414.9 (404.9) Minimum burial depth. Underground piping systems shall be installed a minimum
depth of ~ 18 inches 458 mm) below grade,
(Reason: To provide increased protection to piping systems.)
**Section G2414.9.1; delete.
(Reason: Individual lines should also be buried to 18 inches.)
""Section G2416.4; add a sentence to read as follows:
The equipment used shall be of an appropriate scale such that pressure loss can be easily determined.
(Reason: To stress need for appropriate test equipment.)
""Section G2416.4.1; change to read as follows:
G2416.4.1 (406.4.1) Test pressure. The test pressure to be used shall be not less than sae-grid--sr~e-
10 psig (28 68.9 kPa gauge), or
at the discretion of the Code Official, the piping and valves may be tested at a pressure of at least six (6)
inches (152 mm) of mercury, measured with a manometer or slope gauge.
. For welded piping, and for piping carrying gas at pressures in excess of fourteen (14)
• inches water column pressure (3.48 kPa), the test pressure shall not be less than sixty (60) pounds per
square inch (413.4 kPa).
'`*Section G2416.4.2; change to read as follows:
G2416.4.2 (406.4.2) Test duration. Test duration shall be held for a length of time satisfactory to the
Code Official, but in no case for cast less than a-9 fifteen (15) minutes. For welded piping, and for piping
carrying gas at pressures in excess of fourteen (14) inches water column pressure (3.48 kPa) the test
duration shall be held for a length of time satisfactory to the Code Official, but in no case for less than
thirty (30) minutes.
(Reason: In this region, specific test methods were defined in amendments to the 1996 International
Mechanical Code. Amendments to Sections G2416.4.1 and G2416.4.2 retain those standards, which are
now standard practice)
"'Add Section G2419.1.4 to read as follows:
G2419.1.4 Valves in CSST installations. Shutoff valves installed with corrugated stainless steel
(CSST) piping systems shall be supported with an approved termination fitting or equivalent support
suitable for the size of the valves, of adequate strength and quality and located at intervals so as to
prevent or damp out excessive vibration but in no case greater than 12-inches from the center of the
valve. Supports shall be installed so as not to interfere with the free expansion and contraction of the
system's piping, fittings, and valves between anchors. All valves and supports shall be designed and
installed so they will not be disengaged by movement of the supporting piping.
(Reason: To provide proper security to CSST valves. These standards were established in this region in
• 1999 when CSST was an emerging technology.)
North Central Texas 11 February 2001
2000 IRC amendments
• **Section G2420.1; add a second paragraph and exception to read as follows:
Access to regulators shall comply with the requirements for access to appliances as specified in
Section M1305.
Exception' A passageway or level service space is not required when the regulator is capable of
being serviced and removed through the required attic opening.
(Reason: To require adequate access to regulators.)
**Section G2437.5; add a sentence to read as follows:
The size of duct shall not be reduced along its developed length nor at the point of termination.
(Reason: To clarify the size requirement.)
**Section G2437.5.1; change to read as follows:
G2437.5.1 (613.6.1) Maximum length. The maximum length of a clothes dryer exhaust duct shall not
exceed 25 feet (7620 mm) from the dryer location to the outlet terminal with not more than two bends.
When extra bends are installed, the maximum length of the duct shall be reduced 2 1/2 feet (762 mm) for
each 45-degree (0.79 rad) bend and 5 feet (1524 mm) for each 90-degree (1.6 rad) bend that occur after
the first two bends measuring in the direction of airflow.
{Exception is unchanged}
• (Reason: To make more consistent with regional practice. Dryer technology has improved to the point
where they should be capable of handling this.)
**Section G2443.2; change to read as follows:
G2443.2 (620.2) Prohibited use. One or more unvented room heaters shall not be used as the sole
source of comfort heating in a dwelling unit.
Exception• Existing approved unvented heaters may continue to be used in dwelling units, in
accordance with the code provisions in effect when installed when approved by the Code Official
unless an unsafe condition is determined to exist as described in International Fuel Gas Code
Section 108.7.
(Reason: Gives code official discretion.)
**Section G2446.1.1; change to read as follows:
G2446.1.1 (623.1.1) Installation requirements. The requirements for water heaters relative to access,
sizing, relief valves, drain pans and scald protection shall be in accordance with this code.
(Reason: To clarify installation requirements. Also corresponds with amendments regarding water heater
access.)
•
North Central Texas 12 February 2001
2000 1RC amendments
• **Section P2503.5.1, item 1; add a second paragraph to read as follows:
Shower receptors shall be tested for water tightness by filling with water to the level of the rough
threshold The drain shall be plugged in a manner so that both sides of pans shall be subjected to the
test at the point where it is clamped to the drain.
(Reason: To clarify that a water test is required for a shower receptor.)
**Section P2503.7.2; change to read as follows:
P2503.7.2 Testing. Reduced pressure principle {bulk of section unchanged} at the time of
installation, immediately after repairs or relocation and at regular intervals as required by applicable state
or local provisions I~~~all~.
(Reason: Recognize TNRCC or other local testing procedures that must be adhered to.)
**Add Section P2603.6.1 to read as follows:
P2603 6 1 Sewer depth Building sewers shall be a minimum of 12 inches (304 mm) below grade.
(Reason: Provides sewer depth that is common in this region.)
**Section P2708.1; change to read as follows:
• P2708.1 General. Shower compartments shall {bulk of section unchanged} ...shall be constructed
as per Section R307.2 #~78~4. Such walls shall {remainder of section and exception unchanged}.
(Reason: Reference the correct section.)
**Section P2708.1; add a sentence to read as follows:
Thresholds shall be of sufficient width to accommodate a minimum twenty-two (22) inch (559 mm) door.
**Section P2709.1; add an exception to read as follows:
Exception: Showers designed to comply with ICC/ANSI A117.1.
(Reason: To provide more specific requirements.)
**Section P2710.1; change to read as follows:
P2710.1 Finished. Shower walls shall be finished in accordance with Section R307.2 4.
(Reason: Reference the correct section.)
•
North Central Texas 13 February 2001
2000 IRC amendments
• **Section P2803.6.1; change to read as follows:
P2803.6.1 Requirements for discharge. The outlet of a pressure relief valve, temperature relief valve or
combination thereof, shall not be directly connected to the drainage system. The discharge from the relief
valve shall be piped full size separately to the outside of the building or to an indirect waste receptor
located inside the building.
In areas subject to freezing, the relief valve shall discharge through an air gap into an indirect waste
receptor located within a heated space, or by other approved means. The discharge pipe shall not
discharge into the pan required in Section P2801.5.
The discharge shall be installed in a manner that does not cause personal injury or property damage and
that is readily observable by the building occupants. The discharge from a relief valve shall be trapped.
The diameter of the discharge piping shall not be less than the diameter of the relief valve outlet.
The discharge pipe shall be installed so as to drain by gravity flow and shall terminate atmospherically r~et
. When discharging outside the building, the point of
discharge shall be with the end of the pipe not more than two (2) feet (610 mm) nor less than six (6)
inches (152 mm) above the ground or the floor level of the area receiving the discharge and pointing
downward.
The end of the discharge pipe shall not be threaded.
(Reason: To provide a higher degree of safety.)
**Table P2904.4.1; delete "Polybutylene (PB) plastic pipe and tubing".
. **Sections P2904.5, 2904.5.1 and 2904.12; delete reference to "PB" plastic pipe.
(Reason: Polybutylene pipe is not allowed for use in this region.)
**Section P3005.2.6; changed to read as follows:
P3005.2.6 Upper terminal .Each horizontal drain shall be provided with a cleanout at its
upper terminal
~nFati:
Exception• Cleanouts may be omitted on a horizontal drain less that five (5) feet (1524 mm) in
length unless such line is serving sinks or urinals.
(Reason: To eliminate the requirement for excessive cleanouts.)
**Section P3103.1; changed to read as follows:
P3103.1 Roof extension. All open vent pipes which extend through a roof shall be terminated at least
six 6 inches 152 mm above the roof ,
except that {remainder of section unchanged}.
(Reason: To provide regions{ guideline on standard installation method for this area.)
•
North Central Texas 14 February 2001
2000 IRC amendments
• **Sections P3105.2 and P3105.3 and Figure P3105.3; delete
(Reason: S-trap issues.)
**Section P3111.1; change to read as follows:
P3111.1 Type of fixture. A combination waste and vent system shall not serve fixtures other than floor
drains, standpipes, siflks-and4a-vater+es indirect waste receptors. Combination drain and vent systems
shall not receive the discharge of a food waste grinder.
(Reason: To prevent trap siphoning of sinks and lavatories.)
**Section P3111.2; change to read as follows:
P3111.2 Installation. The only vertical pipe of a combination drain and vent system shall be the
connection between the fixture drain of a sick-lava#arj~-er standpipe, and the horizontal combination
waste and vent pipe. The maximum vertical distance shall be 3~Sk~es 8 feet (~4 2438 mm).
(Reason: To prevent trap siphoning of sinks and lavatories.)
**Section E3301.1; add a sentence to read as follows:
All references to NFPA 70 shall mean the Electrical Code as adopted.
• (Reason: For clarification.)
**Section E3306.3; change to read as follows:
E3306.3. Minimum size of conductors. The minimum size of conductors for feeders-arid branch circuits
shall {remainder of section unchanged}
(Reason: Feeders are covered in E3604.2.)
**Section E3306.6; change to read as follows:
E3306.6 Conductors in parallel. Circuit conductors that are electrically joined at each end to form a
single conductor shall be limited to sizes No. a-9 1 /0 and larger. {remainder of section unchanged.}
(Reason: Editorial.)
**Section E3802.8; change to read as follows:
E3802.8 Exempt receptacles. Receptacles installed under exceptions to Sections E3802.2 and €~8~4
E3802.5 shall not be considered as meeting the requirements of Section €~8a-~9 E3801.9.
(Reason: Editorial.)
• END
North Central Texas 15 February 2001
2000 IRC amendments
Recommended Amendments to the
1999 National Electrical Code
REGIONAL AMENDMENTS*
**Section 230-2(a) add a sixth Special Condition.
230-2. Number of Services. A building or other structure served shall be supplied by only one
service unless permitted in (a) through (d). For the purpose... {text unchanged}...shall be considered
to be supplying one service.
(a). Special Conditions. Additional services shall be permitted to supply
(1) Fire Pumps
(6) In supplying electrical service to multifamily dwellings, two or more laterals or overhead
service drops shall be permitted to a building when both of the following conditions are met:
a The building has six or more individual gang meters and all meters are grouped at the same
location.
b Each lateral or overhead service drop originates from the same point of service.
REASON FOR CHANGE: This is currently the accepted installation practice of the region. No
noteworthy complaints have surfaced. It is more reasonable than the current NEC requirements.
• It allows more than six disconnects grouped at one location, without having to divide the structure
into multiple buildings by using area separation walls. This also allows designers more flexibility in
the placement of electrical meters and main service disconnects.
**Section 230-77(a) add an Exception.
230-71. Maximum Number of Disconnects.
(a) General. The service disconnecting means for each service permitted by Section 230-2, or for
each set of service-entrance conductors permitted by Section 230-40, Exception Nos. 1 or 3, shall
consist of not more than six switches or six circuit breakers mounted in a single enclosure, in a
group of separate enclosures, or in or on a switchboard. There shall be no more than six
disconnects per service grouped in any one location. For the purpose... {text unchanged}...shall not
be considered a service disconnecting means.
Exception ~ Multi-occupant Buildings I~adividual service disconnecting means is limited to six for
each occupant The number of individual disconnects at one location may exceed six.
REASON FOR CHANGE: The same reasoning as for multi-family dwellings in Section 230-2
here being applied to multi-occupant buildings.
• *NOTE: Underlining indicates new words and phrases to be added to the 1999 National
Electrical Code. St~i-l~e~s indicate existing words and phrases to be deleted.
99 NEC 1 of 3 7/16/99
**Section 250-50 add a fifth paragraph.
• 250-50. Grounding Electrode System. If available on the premises at each building or structure
served, each item (a) through (d), and any made electrodes... {text unchanged} ...interconnect
electrodes that are part of the grounding electrode system.
Exception: In industrial {text unchanged} ...conductor is exposed.
Where a metal underground water pipe, as described in item (a), is not present, a method of
grounding as specified in (b) through (d) below shall be used.
(FPN): See Sections... {text unchanged} agriculture buildings.
REASON FOR CHANGE: Sometimes metal underground water pipe is not available for use as a
grounding electrode system. Therefore, to provide a more positive approach for grounding
electrical premise systems for safety, a method as specified in (b), (c), or (d) shall be used. This
will eliminate the need to depend solely on a driven rod or pipe as specified in Section 250-52.
,P:,, z
**Section 250-104(b) change to read as follows:
250-104. Bonding of Piping Systems and Exposed Structural Steel.
*(b) Metal Gas Piping. Each interior abe~gr portion of a metal gas piping system upstream
from the equipment shutoff valve shall be electrically continuous and bonded to the grounding
electrode system. The bonding jumper shall be sized in accordance with Table 250-122 using the
rating of the circuit that may energize the gas piping.
REASON FOR CHANGE: The revisions further clarify what portions of the gas piping system
must be bonded. Without a revision to this section (depending on bond sizing chosen), it was
possible to violate Section 250-52(a), which prohibits using a metal underground gas piping
system as a grounding electrode. The sentence added gives guidance to proper sizing to ensure
the gas system will be brought to the same potential as a grounding electrode system when an
inspector perceives a reasonable possibility that the gas system may become energized.
**Section 310-15(b)(6) change to read as follows:
310-15. Ampacities for Conductors Rated 0 to 2000 Volts.
(b) Tables.
(6) 120/240-Volt, 3-Wire, Single-Phase Dwelling Services and Feeders. For dwelling
units, conductors, as listed in Table 310-15(b)(6), shall be...{text unchanged}...conductors. The
grounded conductor shall be permitted to be smaller than the ungrounded conductors, provided the
requirements of Sections 215-2, 220-22, and 230-42 are met. This Section shall not be used in
conjunction with Section 220-30.
• REASON FOR CHANGE: To provide a more reasonable margin of safety for dwelling service
and feeder conductor allowable ampacities.
99 NEC 2 of 3 7/16/99
• **Section 336-5(a)(1) add an Exception; Section 336-5(a) add a tenth restriction.
336-5. Uses Not Permitted.
(a) Types NM, NMC, and NMS. Types NM, NMC, and NMS cables shall not be used in the
following:
(1) In any multifamily dwelling or other structure exceeding three floors above grade
For the purpose of this article, the first floor of a... {text unchanged} ...vehicle parking, storage,
or similar use shall be permitted.
Exception • An additional level shall be permitted in multifamily dwellings where the entire
structure is protected throughout by an approved automatic sprinkler system.
(2) As service-entrance cable.
(10) In non-residential metal frame structures.
•
REASON FOR CHANGE: To allow a reasonable expansion for NM cable use in dwelling
occupancies, while somewhat limiting the use of NM cable in occupancies where it is more
vulnerable to physical damage and where use is somewhat limited by the NEC and building
codes. This allows nonmetallic sheathed cable as a wiring method in four story single or
multifamily dwellings provided they are fully sprinkled throughout the entire building. It allows
designers to be more cost effective in their designs of wiring methods.
RE(_:IONAL INTERPRETATIONS
220-36.Optional Calculation New Restaurants.
[This specification may apply to restaurants regarding new occupancy, new buildings,
change of occupancy in existing building, or upgrading existing buildings to new electrical
load requirements.]
ENll
•
99 NEC 3 of 3 7~16~99
• Recommended Amendments to the
2000 International Energy Conservation Code
North Central Texas Council of Governments region
**Section 101.3; amend as follows:
101.3 Compliance. Compliance with this code shall be determined in accordance with Sections 101.3.1
acid-101.3.2, or 101.3.3.
**Add the following item:
101 3 3 Alternative compliance. A building certified through a voluntary energy performance testing
pr~ram approved as meeting or exceeding the provisions of this code may be deemed to comply with
the requirements of this code.
(Reason: This amendment would encourage participation in above-code programs and provide an
attractive alternative path for unconventional builders who are committed to quality and efficiency, but
concerned about mechanics of code compliance. NCTCOG will arrange advisory review of such
programs.)
**Section 302.1; Replace blank Table 302.1 Exterior Design Conditions with the following:
CONDITION VALUE
Winter ,design dry-bulb (F) (99.6%) 17
Summer ,design dry-bulb (F) (0.4%) 100
• Summer ,design wet-bulb (F) (0.4%) 78
Degree days heating 2407
Degree days cooling 2603
Climate zone 56
**Delete note "a"and replace with fhe following:
a. These values are from ASHRAE Handbook of Fundamentals for Dallas/Ft. Worth International Airport
99.6% Winter DB 0.4% Summer DB and 0.4% Summer WB~ and from Local Climatological Data for
Dallas-Ft Worth published by the National Climatic Data Center National Oceanic and Atmospheric
Administration. These values are for the purpose of providing a uniform basis of requirements for North
Central Texas This will not preclude licensed professionals from submitting design analyses based on
site measurements or published data more specific to the building site Adjustments shall be permitted to
reflect local climates which differ from the tabulated values or local weather experience determined by
the code official.
(Reason: One of the references in note "a" is in error. The 1997 ASHRAE Handbook of Fundamentals
no longer publishes the design temperature tables in the format assumed by this reference. The main
purpose of this change, however, is to provide typical design data for the NCTCOG region for ease of
reference within this code.)
**Delete Figures 302.1 (1-43, 45-51).
(Reason: There is no need to reference the maps of other states.)
•
North Central Texas 1 February 2001
2000 IECC amendments
• "''Section 502.1.1; delete exception #2 and substitute the following:
2. Buildings located in Climate Zones 1 through 9 as indicated in Table 302.1.
(Reason: This would eliminate the requirement of a vapor retarder throughout the NCTCOG region.
Eliminating vapor retarders in hot and humid climate zones is consistent with the recommendation of
most building scientists.)
**Section 502.1.5; add the following exceptions:
Exceptions:
1. Any glazing facing within 45 degrees of true north;
2. Any glazing facing within 45 degrees of true south which is shaded along its full width by a
permanent overhang with a projection factor of 0.3 or greater.
3. Any fenestration with attached screens where the screens have a rated shading coefficient of .6
or less.
(Reason: This will allow north facing windows, which do not receive direct solar radiation, to be exempt
from the minimum SHGC requirement; provides a simple way for south facing windows to effectively
achieve summer shade and still receive some solar heat benefit in winter; and specifically allows use of
solar screens to achieve the shading effect.)
**Section 502.2; Replace blank Table 502.2 Heating & Cooling Criteria with the following:
Table 502.2a°9
• HEATING AND COOLING CRITERIA
Element Mode Type A-1 Residential Type A-2 Residential
Buildings Buildings
Uo Uo
Walls Heating or cooling 0.15 0.22
Roof/ceiling Heating or cooling 0.03 0.03
Floors over unheated Heating or cooling 0.05 0.05
spaces
Heated slab on grade Heating R-value = 6 R-value = 6
Unheated slab on Heating R-value = 0 R-value = 0
grade
Basement wall Heating or cooling U-factor = 0.15 U-factor = 0.15
Crawl space wall Heating or cooling U-factor = 0.15 U-factor = 0.15
**De/ete Note "a"and replace with the following:
a. The above values have been determined for all counties in the North Central Texas Council of
Governments region.
**Add Note "g":
g. These requirements apply only to the boundaries of conditioned space. Air conditioning equipment is
recommended, but not required, to be located within the conditioned space in North Central Texas zones.
**Delete Figures 502.2(1-6)
(Reason: This change unifies the requirements for all counties within the North Central Texas COG.
. Reference to the graphs is no longer needed when the values have been specified.)
North Central Texas 2 February 2001
2000 IECC amendments
• *"Section 502.2; Add note to Fig 502.2(7):
All counties within the North Central Texas Council of Governments region are designated as within the
area of very heavy termite infestation probability for purpose of uniform interpretation of this requirement.
(Reason: This allows for uniform interpretation of the map throughout the area of the COG.)
**Section 502.2.4; Delete prescriptive Tables 502.2.4(1-9) and substitute the following:
''''Replace Tables 502.2.4 (1-6) with:
Table 502.2.4(1)
Prescriptive Building Envelope Requirements, Type A-1 Residential Buildings, Based on Window
Area as a Percent of Gross Exterior Wall Area (for zones 5b and 6b)
Maximum Minimum
Glazing Glazing Ceiling Exterior Floor Basement Slab Crawl
U-factor R-value wall R-value wall perimeter space
R-value R-value R-value wall
and R-value
depth
<8% 0.70 R-26 R-11 R-11 R-5 R-0 R-6
<12% 0.65 R-26 R-13 R-11 R-5 R-0 R-5
<15% 0.65 R-30 R-13 R-11 R-6 R-0 R-7
<18% 0.52 R-30 R-13 R-19 R-6 R-0 R-7
<20% 0.50 R-38 R-13 R-19 R-6 R-0 R-7
• <25% 0.46 R-38 R-16 R-19 R-6 R-0 R-7
''*Replace Tables 502.2.4 (7-9) with:
Table 502.2.4(2)
Prescriptive Building Envelope Requirements, Type A-2 Residential Buildings, Based on Window
Area as a Percent of Gross Exterior Wall Area
Maximum Minimum
Glazing Glazing Ceiling Exterior Floor Basement Slab Crawl
U-factor R-value wall R-value wall perimeter space
R-value R-value R-value wall
and R-value
depth
<20% 0.55 R-30 R-13 R-11 R-5 R-0 R-6
<25% 0.55 R-30 R-13 R-11 R-5 R-0 R-5
<30% 0.47 R-38 R-13 R-19 R-7 R-0 R-8
(Reason: This change a) reduces the number of tables to be referenced; b) unifies envelope prescriptive
requirements across all areas within the COG, requiring the more restrictive values of zones 5b or 6b; and
c) eliminates slab edge insulation requirement.)
•
North Central Texas 3 February 2001
2000 IECC amendments
• **Section 503.3.3.3; amend as follows:
All supply and return-air ducts and plenums installed as part of an HVAC air-distribution system shall be
thermally insulated in accordance with Table 503.3.3.3 or where such ducts or plenums operate at static
pressures greater than 2 in w q (500 Pa) in accordance with Section 503.3.3.4.1.
(Reason: This change clarifies that requirements for higher pressure ducts are given elsewhere. These
duct systems are typically associated with commercially sized equipment. This change will be included in
the IECC 2001 Supplement.)
*"Section 503.3.3.4; amend subsections as follows:
503.3.3.4.1 High- and medium-pressure duct systems. All ducts and plenums operating at static
pressures greater than 2 in. w.q. (500 Pa) shall be insulated and sealed in accordance with Section
803.2.8. ~ Ducts operating at static pressures in excess of 3 in. w.g.
750 Pa shall be leak tested in accordance with
. Section 803.3.6. Pressure
classifications specific to the duct system shall be clearly indicated on the construction documents in
accordance with the International Mechanical Code.
503.3.3.4.2 Low pressure duct systems. All longitudinal and transverse joints, seams and connections
of tEssur~supply and return ducts operating at static pressures less than or equal to 2 in. w.q. (500
Pa shall be securely fastened and sealed with welds gaskets, mastics (adhesives), mastic-plus-
embedded fabric systems or tapes installed in accordance with the manufacturer's installation
instructions. Pressure classifications specific to the duct system shall be clearly indicated on the
construction documents in accordance with the International Mechanical Code.
• {Exception is unchanged}
(Reason: These changes, which will be included in the 2001 Supplement to the IECC, are necessary
because the term "low" and "high" have been discontinued by SMACNA. The modification more clearly
delineates the static pressure classification of duct systems in question.)
Section 802.2; Replace blank tables 802.2 (1-4) with the completed tables provided on the
following four pages. Delete tables 802.2 (5-37).
(Reason: This change provides a unified set of prescriptive requirements for all areas within the
NCTCOG area based upon the most restrictive zone's requirements (5b or 6b). The deleted tables are
not necessary after tables 1-4 are completed, and eliminates data irrelevant to the NCTCOG region.)
•
North Central Texas 4 February 2001
2000 IECC amendments
• TABLE 802.2(1)
BUILDING ENVELOPE REQUIREMENTS
WINDOW AND GLAZED DOOR AREA 10 PERCENT OR LESS OF ABOVE-GRADE WALL
AREA
ELEMENT CONDITION/VALUE (Zones 5B,6B)
Skylights (U-factor) 1
Slab or below-grade wall (R-value) R-0
Windows and glass doors SHGC U-factor
PF < 0.25 Any Any
0.25 < PF < 0.50 Any Any
PF > 0.50 Any Any
Roof assemblies (R-value) Insulation between Continuous insulation
framing
All-wood joist/truss R-19 R-16
Metal joist/truss R-25 R-17
Concrete slab or deck NA R-16
Metal purlin with thermal block R-25 R-17
Metal purlin without thermal block X R-17
Floors over outdoor air or Insulation between Continuous insulation
unconditioned space (R-value) framing
All-wood joistltruss R-11 R-6
Metal joist/truss R-11 R-6
Concrete slab or deck NA R-6
Above-grade walls (R-value) No framing Metal framing Wood framing
Framed
• R-value cavity NA R-11 R-11
R-value continuous NA R-0 R-0
CMU, ? 8 in., with integral insulation
R-value cavity NA R-0 R-0
R-value continuous R-0 R-0 R-0
Other masonry walls
R-value cavity NA R-0 R-0
R-value continuous R-0 R-0 R-0
•
North Central Texas 5 February 2001
2000 IECC amendments
• TABLE 802.2(2)
BUILDING ENVELOPE REQUIREMENTS
WINDOW AND GLAZED DOOR AREA OVER 10 PERCENT BUT NOT GREATER THAN 25
PERCENT OF ABOVE-GRADE WALL AREA
ELEMENT CONDITION/VALUE
Skylights (U-factor) 1
Slab or below-grade wall (R-value) R-0
Windows and glass doors SHGC U-factor
PF < 0.25 0.6 Any
0.25 < PF < 0.50 0.7 Any
PF > 0.50 Any Any
Roof assemblies (R-value) Insulation between Continuous insulation
framing
All-wood joist/truss R-25 R-19
Metal joist/truss R-25 R-20
Concrete slab or deck NA R-19
Metal purlin with thermal block R-30 R-20
Metal purlin without thermal block X R-20
Floors over outdoor air or Insulation between Continuous insulation
unconditioned space (R-value) framing
All-wood joist/truss R-11 R-6
Metal joist/truss R-11 R-6
Concrete slab or deck NA R-6
Above-grade walls (R-value) No framing Metal framing Wood framing
Framed
• R-value cavity NA R-11 R-11
R-value continuous NA R-0 R-0
CMU, > 8 in., with integral insulation
R-value cavity NA R-11 R-11
R-value continuous R-5 R-0 R-0
Other masonry walls
R-value cavity NA R-11 R-11
R-value continuous R-5 R-0 R-0
•
North Central Texas 6 February 2001
2000 IECC amendments
• TABLE 802.2(3)
BUILDING ENVELOPE REQUIREMENTS
WINDOW AND GLAZED DOOR AREA OVER 25 PERCENT BUT NOT GREATER THAN 40
PERCENT OF ABOVE-GRADE WALL AREA
ELEMENT CONDITION/VALUE
Skylights (U-factor) 1
Slab or below-grade wall (R-value) R-0
Windows and glass doors SHGC U-factor
PF < 0.25 0.4 0.7
0.25 < PF < 0.50 0.5 0.7
PF>0.50 0.6 0.7
Roof assemblies (R-value) Insulation between Continuous insulation
framing
All-wood joist/truss R-25 R-19
Metal joist/truss R-25 R-20
Concrete slab or deck NA R-19
Metal purlin with thermal block R-30 R-20
Metal purlin without thermal block X R-20
Floors over outdoor air or Insulation between Continuous insulation
unconditioned space (R-value) framing
All-wood joisUtruss R-11 R-6
Metal joist/truss R-11 R-6
Concrete slab or deck NA R-6
Above-grade walls (R-value) No framing Metal framing Wood framing
Framed
• R-value cavity NA R-11 R-11
R-value continuous NA R-0 R-0
CMU, > 8 in., with integral insulation
R-value cavity NA R-11 R-11
R-value continuous R-5 R-0 R-0
Other masonry walls
R-value cavity NA R-11 R-11
R-value continuous R-5 R-0 R-0
•
North Central Texas 7 February 2001
2000 IECC amendments
TABLE 802.2(4)
BUILDING ENVELOPE REQUIREMENTS
WINDOW AND GLAZED DOOR AREA OVER 40 PERCENT BUT NOT GREATER THAN 50
PERCENT OF ABOVE-GRADE WALL AREA
ELEMENT CONDITION/VALUE
Skylights (U-factor) 1
Slab or below-grade wall (R-value) R-0
Windows and glass doors SHGC U-factor
PF < 0.25 0.4 0.7
0.25<PF<0.50 0.5 0.7
PF>0.50 0.6 0.7
Roof assemblies (R-value) Insulation between Continuous insulation
framing
All-wood joist/truss R-25 R-19
Metal joist/truss R-25 R-20
Concrete slab or deck NA R-19
Metal purlin with thermal block R-30 R-20
Metal purlin without thermal block R-38 R-20
Floors over outdoor air or Insulation between Continuous insulation
unconditioned space (R-value) framing
All-wood joist/truss R-11 R-6
Metal joist/truss R-11 R-6
Concrete slab or deck NA R-6
Above-grade walls (R-value) No framing Metal framing Wood framing
Framed
• R-value cavity NA R-13 R-11
R-value continuous NA R-3 R-0
CMU, > 8 in., with integral insulation
R-value cavity NA, NA R-11 R-11
R-value continuous R-5 R-0 R-0
Other masonry walls
R-value cavity NA R-11 R-11
R-value continuous R-5 R-0 R-0
"*Section 805.2.1 Interior Lighting Controls; add a third sentence to read:
Large spaces shall have a separate switch or control for each 2500 square feet of floor area.
(Reason: This change is consistent with energy conservation measures in the 4th public review ASHRAE
90.1 - 1999, Space Control. This "zoning" is especially relevant for after-hours employees in office
spaces.)
Chapter 9; Replace referenced standard as follows:
ASHRAE/IES 99 Energy Efficient Design of New Buildings Except Low-Rise Residential Buildings
1999 Edition
(Reason: This adopts the most recent edition of the ASHRAE Standard 90.1 as the reference standard for
commercial construction.)
• END
North Central Texas 8 February 2001
2000 IECC amendments