Item 7BCity of Southlake, Texas
MEMORANDUM
July 14, 2004
TO: Billy Campbell, City Manager
FROM: Rick Black, Director of Public Safety (Ext. 242 1)
SUBJECT: Ordinance No. 869, 2nd Reading, Adoption of the 2003 International Energy
Conservation Code.
Action Requested: City Council approval of Ordinance No. 869 adopting the 2003 International
Energy Conservation Code with local amendments.
Background
Information: The city currently operates under the 2000 editions of the International Codes
and under the 1999 edition of the National Electrical Code. These codes are
published on a three year cycle. The North Central Texas Council of
Governments Executive Board with the recommendation of the Regional
Code Coordinating Committee has recommended adoption of these codes
except the Property Maintenance Code be adopted with regional amendments.
The Property Maintenance Code is included as an update for the Dangerous
Building Code.
Financial
Considerations: These updated codes will have nominal impact on the cost of construction in
the city.
Financial Impact: This will have no financial impact on the city budget.
Citizen Input/
Board Review: The Building Board of Appeals held three public hearings and unanimously
recommended adoption of these codes. Two additional meetings were held to
receive input from the area building contractors.
Legal Review: This ordinance has been reviewed by the city attorney and changes have been
made as recommended.
Alternatives: Adopt the ordinance as recommended or direct staff to restudy any specific
issues that may be of concern.
Supporting
Documents: Detailed memorandum to Garland Wilson dated June 21, 2004
Ordinance No. 869, 2003 International Energy Conservation Code
Billy Campbell
July 14, 2004
Page 2
Staff
Recommendation: Approve Ordinance No. 869 on second reading with an effective date of
September 30, 2004.This is intended to provide builders time to factor changes
into contracts being developed.
RB /gw
City of Southlake, Texas
MEMORANDUM
June 21, 2004
TO: Garland Wilson, Chief of Administrative Services
FROM: Paul Ward, Building Official, and;
Chuck Bloomberg, Plans Examiner
SUBJECT: 2003 International Codes
The ICC, International Code Council, is a nonprofit organization founded in 1994 to develop a
single set of comprehensive and coordinated national model construction codes for use
throughout the country.
We as the City of Southlake have been involved and supportive throughout the code development
process and the creation of the International Codes. This support has been through the North
Texas chapter of the International Code Council and through the regional review process be the
Regional Codes Coordinating Committee of the NCTCOG (North Central Texas Council of
Governments).
The I Codes were developed with the support of many organizations that have interest in the
construction industry although the final vote on all items is by code officials only. Work on the
International Codes has been a model of democracy, without territorial disparities getting in the
way. The American Institute of Architects and the National Association of Home Builders were
both very active participants in the code development process. The National Association of Home
Builders has applauded the recent action by the International Code Council (ICC) to add
"affordability" to the Purpose Statement section of the International Residential Code (IRC), which
applies to one- and two - family homes.
The City of Southlake has had a track record of supporting the latest edition of the codes. The
code has been published every three years for a long time. Since the 1980's Southlake has
adopted the new code within one year of it becoming available.
Another important reason to be up to date with the latest codes is the ISO insurance rating. Their
system will subtract points if the city is not on the current codes. We always need to be able to
show that we are current with the latest codes.
The Building Codes are a set of universally accepted standards adopted as guidelines for
construction of buildings and related building operations. The term "building codes" is a generic
phase that actually encompasses several individual codes, each of which must be approved and
adopted by the City Council before they can be applied or enforced. These codes are periodically
updated, primarily due to new products entering the marketplace, and minor revisions may be
made under the term "local amendments."
The International Energy Conservation Code (IECC) provides minimum standards for insulation of
buildings as well as minimum efficiency levels for mechanical equipment. The local adoption of
this code is required by state law. Southlake currently operates under the 2000 IECC. The
proposed ordinance will bring us up to date by adopting the 2003 edition of the International
Energy Conservation Code (2003 IECC). This ordinance was created from the framework of the
previous ordinance, inserting the NCTCOG recommended regional amendments. The Building
and Energy subcommittee at NCTCOG is continuing to meet this summer and expect to have
some more amendments later this year that will assist the region in attaining better air quality.
2003 International Energy Conservation Code
ORDINANCE NO. 869
AN ORDINANCE ADOPTING THE 2003 EDITION OF THE INTERNATIONAL ENERGY CONSERVATION
CODE, REGULATING THE DESIGN OF BUILDING ENVELOPES FOR ADEQUATE THERMAL
RESISTANCE AND LOW AIR LEAKAGE AND THE DESIGN AND SELECTION OF MECHANICAL,
ELECTRICAL, SERVICE WATER- HEATING AND ILLUMINATION SYSTEMS AND EQUIPMENT IN THE
CITY OF SOUTHLAKE AND; PROVIDING FOR THE ADOPTION OF LOCAL AMENDMENTS THERETO;
PROVIDING FOR_RECORDING OF SUCH CODE AS A PUBLIC RECORD; PROVIDING THAT THIS
ORDINANCE SHALL BE CUMULATIVE OF ALL ORDINANCES; PROVIDING A SEVERABILITY
CLAUSE; PROVIDING FOR A PENALTY FOR VIOLATIONS HEREOF; 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 Southlake 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 77 Texas Legislature adopted Senate Bill 5 requiring cities to adopt the 2000 International
Energy Conservation Code, and the City Council of the City of Southlake deems it necessary to adopt this ordinance
providing minimum standards to regulate the design of building envelopes for adequate thermal resistance and low air
leakage and the design and selection of mechanical, electrical, service water - heating and illumination systems and
equipment which will enable effective use of energy in new building construction.
WHEREAS, beginning in the summer of 2003, NCTCOG's Regional Codes Coordinating
Committee (RCCC) and its four advisory boards conducted 26 open review meetings over a 10-
month period to review the 2003 editions of the International Codes and to develop regional
amendments. Their review and recommendations were completed and endorsed by NCTCOG's
Executive Board in March 2004. Now NCTCOG encourages jurisdictions in North Central Texas to
adopt the 2003 International Energy Conservation Code along with its respective regional
amendments with an effective date of July 1, 2004:
NOW, THEREFORE, BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF SOUTHLAKE,
TEXAS:
SECTION 1
That the International Energy Conservation Code, 2003 Edition, published by the International Code
Council, including the standards referenced therein, is hereby adopted as the Energy Conservation Code of the City
of Southlake regulating the design of building envelopes for adequate thermal resistance and low air leakage and the
design and selection of mechanical, electrical, service water - heating and illumination systems and equipment in the
City of Southlake, except for fuel facilities otherwise regulated under the International Residential Code for One-
and Two- Family Dwellings as adopted. A true and correct copy of this document is attached as Exhibit "A."
SECTION 2
That the 2003 International Energy Conservation Code, as adopted herein, is hereby amended as in Exhibit
"B" incorporated herein and attached hereto for all purposes of this ordinance. The City of Southlake, Texas may
from time to time determine that additional local modifications to the Energy Conservation Code are necessary and
appropriate to meet the unique needs of the City of Southlake, Texas. To effectuate these local modifications, the
City Council shall enact individual ordinances amending this Ordinance, fully setting forth the change to be made in
the Energy Conservation Code. Upon adoption, copies of these amendments shall be attached to Exhibit "B" to this
Ordinance.
SECTION 3
The material contained in Exhibits "A" and `B "_to this ordinance 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 4
This ordinance shall be cumulative of all provisions of ordinances of the City of Southlake, Texas, except where the
provisions of this ordinance are in direct conflict with the provisions of such ordinances, in which event the
conflicting provisions of such ordinances are hereby repealed.
SECTION 5
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 phrases, clauses, sentences, paragraphs and sections of this
ordinance, since the same would have been enacted by the City Council without the incorporation in this ordinance
of any such unconstitutional phrase, clause, sentence, paragraph or section.
SECTION 6
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 not more than Two Thousand Dollars ($
2,000.00) for all violations involving zoning, fire safety or public health and sanitation, including dumping or refuse,
and shall be fined not more _than five hundred dollars ($500) for all other violations of this ordinance each day that a
violation is permitted to exist shall constitute a separate offense.
SECTION 7
All rights and remedies of the City of Southlake are expressly saved as to any and all violations of the provisions of
any ordinances affecting the regulation of the design of building envelopes for adequate thermal resistance and low
air leakage and the design and selection of mechanical, electrical service water- heating and illumination systems and
equipment within the City 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 may be prosecuted until final disposition by the courts.
SECTION 8
The City Secretary of the City of Southlake is hereby authorized to publish this ordinance in book or pamphlet form
for general distribution among the public, and the operative provisions of this ordinance as so published shall be
admissible in evidence in all courts without further proof than the production thereof.
SECTION 9
The City Secretary of the City of Southlake is hereby directed to publish in the official newspaper of the City of
Southlake, the caption, penalty clause, publication clause and effective date of this ordinance one time within ten
days after passage of this ordinance, as required by Section 3.13 of the Charter of the City of Southlake.
SECTION 10
This ordinance shall be in full force and effect from and after its passage and publication as required by law, but not
sooner than September 30, 2004, and it is so ordained.
PASSED AND APPROVED ON FIRST READING THIS _ DAY OF , 2004.
MAYOR
ATTEST:
CITY SECRETARY
PASSED AND APPROVED ON SECOND READING THIS _ DAY OF , 2004.
MAYOR
ATTEST:
CITY SECRETARY
APPROVED AS TO FORM AND LEGALITY:
City Attorney
Date:
EFFECTIVE:
EXHIBIT `B"
Recommended Amendments to the
2003 International Energy Conservation Code
North Central Texas Council of Governments region
The following sections, paragraphs, and sentences of the 2003 International Energy Conservation Code are hereby
amended as follows: Standard type is text from the IECC. Underlined type is text inserted. Lined through typo is-
deleted te)d from the !EGG A double asterisk at the beginning of a section identifies an amendment carried over from
the 2000 edition of the code and a triple asterisk identifies a new amendment with the 2003 edition of the code. After
each code amendment a reason is given in parentheses. The reason is not a part of the code, but is given to aid in
understanding the code.
*Adel the following section:
101.4.1.3 Alternative compliance. A building certified by a national, state, or local accredited energy efficiency
program and determined by the Energy Systems Laboratory to be in compliance with the energy efficiency
requirements of this section may, at the option of the Code Official, be considered in compliance. The United States
Environmental Protection Agency's Energy Star Program certification of energy code equivalency shall be considered
in comaliance.
(Reason: This amendment is added to allow alternative compliance in accordance with Texas HB 1365,
78 Legislature.)
* *Section 302.1; Replace blank Table 302.1 Exterior Design Conditions with the following:
CONDITION
VALUE
Winter a , design dry-bulb ( ° F) (99.6 %)
17
Summer design dry -bulb ( ° F) (0.4 %)
98
Summer design wet -bulb ( ° F) (0.4 %)
74
Degree days heating
2407
Degree days cooling
2603
Climate zone °
5B
* *Delete note "a" and replace with the 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. Adiustments 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.)
* *Section 502.1.1; delete exception #2 and substitute the following:
2. Buildings located in Climate Zones 5b.
(Reason: The region is located in Climate Zone 5b by amendment. 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 permanently 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 502.2"
HEATING AND COOLING CRITERIA
Element
Mode
Type n_4 Residential
Buildings Detached
One - Family Dwellings
U.
Type n_9 Residential
Buildings Detached
Two - Family Dwellings
U.
Walls
Heating or cooling
0.15
0.22
Roof /ceiling
Heating or cooling
0.03
0.03
Floors over unheated
spaces
Heating or cooling
0.05
0.05
Heated slab on grade
Heating
R -value = 6
R -value = 6
Unheated slab on
grade
Heating
R -value = 0
R -value = 0
Basement wall
Heating or cooling
U- factor = 0.15
U-f actor = 0.15
Crawl space wall
Heating or cooling
U- factor = 0.15
U- factor = 0.15
* *Delete 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 and ductwork
is recommended. but not reauired. 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.)
* *Section 502.2; Add note to Fig 502.2(7):
All counties within the North Central Texas Council of Governments reaion are desianated
as within the area of very heavv termite infestation arobability for auraose of uniform
interpretation of this requirement.
(Reason: This allows for uniform interpretation of the map throughout the area of the COG.)
** *Section 502.2.2; add a second paragraph as follows:
A building demonstrating envelope compliance at least 10% better than code may utilize R6 duct
insulation in both suaDly and return air ducts in lieu of the insulation reauired by Table 503.3.3.3.
(Reason: The use of R6 duct insulation in lieu of R8 for supply duct insulation and R4 for return duct
insulation in structures — all other factors being equal — only makes a difference of 2% in performance
compliance. Use of R6 in a structure that is 10% better than code will still be 8% above code. This tradeoff
may be used with any SEER rating of equipment.)
* *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, Detached One - Family Dwellings, Based on Window Area as a
Percent of Gross Exterior Wall Area
%
Maximum
Minimum
Glazing
Glazing
U- factor
Ceiling
R -value
Exterior
wall
R -value
Floor
R -value
Basement
wall
R -value
Slab
perimeter
R -value
and
depth
Crawl
space
wall
R -value
< 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%
0.60
R -30
R -13
R -19
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, Detached Two - Family Dwellings, 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 -5
< 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.)
* *Table 503.3.3.1 MINIMUM PIPE INSULATION. Amend footnote "a" to read as follows:
a. For piping lengths in excess of five (5) feet exposed to outdoor air, increase the insulation
thickness by 0.5 inch.
(Reason: No performance data available, REM /Rate scoring procedures do not consider refrigerant piping
insulation. This amendment will provide uniform approach and eliminate the requirement of policies by the
various jurisdictions.)
** *Table 503.3.3.3; add footnote "e" as follows:
e. See Section 502.2.2
(Reason: To provide reference to duct R -value tradeoff.)
** *Section 503.3.3.4.3; change first sentence to read as follows:
503.3.3.4.3 Sealina reauired. All ioints. lonaitudinal and transverse seams. and connections in
ductwork, shall be made substantially airtight by means of welds, gaskets, mastics (adhesives),
mastic -plus- embedded - fabric systems or tapes or other approved closure systems. {Remainder to
remain unchanged}
(Reason: Provides the building official the ability to consider new technology)
** *Section 602.1.6; delete last sentence of exception.
(Reason: Slab edge insulation is not recommended in this region. Deleting the last sentence of the
exception allows the use of the simplified prescriptive method of compliance.)
** *Section 602.2 Maximum solar heat gain coefficient for fenestration products. 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 exception has been previously granted in Chapter 5 but did not apply to the simplified
approach. The logic for the exception is the same)
** 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.)
TABLE 802.2(1)
BUILDING ENVELOPE REQUIREMENTS
(See next page for table)
10
TABLE 802.2(1)
BUILDING ENVELOPE REQUIREMENTS
WINDOW AND GLAZED DOOR AREA 10 PERCENT OR LESS 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
PF < 0.25
0.25 < PF < 0.50
PF > 0.50
SHGC
U- factor
Any
Any
Any
Any
Any
Any
Roof assemblies (R- value)
All -wood joist /truss
Metal joist /truss
Concrete slab or deck
Metal purlin with thermal block
Metal purlin without thermal block
Insulation between
framing
Continuous insulation
R -19
R -16
R -25
R -17
NA
R -16
R -25
R -17
X
R -17
Floors over outdoor air or
unconditioned space (R- value)
All -wood joist /truss
Metal joist /truss
Concrete slab or deck
Insulation between
framing
Continuous insulation
R -11
R -6
R -11
R -6
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
11
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
PF < 0.25
0.25 < PF < 0.50
PF > 0.50
SHGC
U- factor
0.6
Any
0.7
Any
Any
Any
Roof assemblies (R- value)
All -wood joist /truss
Metal joist /truss
Concrete slab or deck
Metal purlin with thermal block
Metal purlin without thermal block
Insulation between
framing
Continuous
insulation
R -25
R -19
R -25
R -20
NA
R -19
R -30
R -20
X
R -20
Floors over outdoor air or
unconditioned space (R- value)
All -wood joist /truss
Metal joist /truss
Concrete slab or deck
Insulation between
framing
Continuous
insulation
R -11
R -6
R -11
R -6
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
12
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
PF <0.25
0.25 < PF <0.50
PF > 0.50
SHGC
U- factor
0.4
0.7
0.5
0.7
0.6
0.7
Roof assemblies (R- value)
All -wood joist /truss
Metal joist /truss
Concrete slab or deck
Metal purlin with thermal block
Metal purlin without thermal block
Insulation between
framing
Continuous
insulation
R -25
R -19
R -25
R -20
NA
R -19
R -30
R -20
X
R -20
Floors over outdoor air or
unconditioned space (R- value)
All -wood joist /truss
Metal joist /truss
Concrete slab or deck
Insulation between
framing
Continuous
insulation
R -11
R -6
R -11
R -6
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
13
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
PF <0.25
0.25 < PF <0.50
PF > 0.50
SHGC
U- factor
0.4
0.7
0.5
0.7
0.6
0.7
Roof assemblies (R- value)
All -wood joist /truss
Metal joist /truss
Concrete slab or deck
Metal purlin with thermal block
Metal purlin without thermal block
Insulation between
framing
Continuous
insulation
R -25
R -19
R -25
R -20
NA
R -19
R -30
R -20
R -38
R -20
Floors over outdoor air or
unconditioned space (R- value)
All -wood joist /truss
Metal joist /truss
Concrete slab or deck
Insulation between
framing
Continuous
insulation
R -11
R -6
R -11
R -6
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
** *Add footnote "f" to SHGC column heading in Tables 802.2 (2), 802.2 (3) and 802.2 (4) to read as follows:
f. Minimum SHGC requirements do not apply to glazing as follows:
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 0.30 or greater.
3. Any glazing with permanent attached screens where the screens have a rated shading coefficient
of 0.60 or less.
(Reason: This exception has been previously granted in Chapter 5. The logic for the exception is the
same.)
* *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.)
* *Delete Figures 902.1 (1 -43, 45 -51).
(Reason: There is no need to reference the maps of other states.)
** Chapter 10; Replace referenced standard as follows:
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ASHRAE 90.1 -2001 Energy Standard for Buildings Except Low -Rise Residential Buildings
ASHRAE /IES -- 99 Energy Efficient Design of New Buildings Except Low -Rise Residential Buildings -- 1999
Edition
Chapter 10 — Referenced Standards: Under the heading ASHRAE and IESNA, change the Standard Reference
Number from 90.1 -2001 to 90.1 -1999.
(Reason: This amendment is consistent with the Texas Building Energy Performance Standards.)
LaW
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