HomeMy WebLinkAboutOrd 251-2006 Adopting 2003 International Energy Code with Amendments.pdfClTY OF ANNA, TEXAS
ORDINANCE NO. 251 -2006
AN ORDINANCE OF THE ClTY OF ANNA, TEXAS, ADOPTING THE
2003 EDITION OF THE INTERNATIONAL ENERGY CODE; ADOPTING
THE NORTH CENTRAL TEXAS COUNCIL OF GOVERNMENTS
RECOMMENDED AMENDMENTS, AS AMENDED HEREIN; ADOPTING
A SCHEDULE OF FEES; AUTHORIZING THE MAYOR OR HIS
AUTHORIZED REPRESENTATIVE TO ENFORCE THE PROVISIONS
OF THE INTERNATIONAL ENERGY CODE; PROVIDING A REPEALER
CLAUSE; PROVIDING A SAVINGS CLAUSE; AND PROVIDING FOR
AN EFFECTIVE DATE
WHEREAS, the city council has determined that the a need exists for an energy code in
order to encourage energy conservation and higher level building construction
standards; and
WHEREAS, the state had mandated that the International Codes or comparable
regulations are to be used if the City intends to regulate building construction; and
WHEREAS, the other cities in the North Central Texas area have adopted or intend to
adopt the lnternational Codes and the city council desires that the City of Anna should
have building standards comparable to other cities in the area; now therefore
BE IT ORDAINED BY THE ClTY COUNCIL OF THE ClTY OF ANNA, TEXAS:
Section 1. lnternational Energy Conservation Code adopted.
The city council hereby adopts the 2003 lnternational Energy Conservation Code and
the amendments thereto, as referenced herein, are on file in the office of the city
secretary for permanent record and inspection. The mayor, or his authorized
representative, is hereby authorized and directed to enforce all provisions of the
lnternational Energy Conservation Code, as adopted herein and as amended.
Section 2. Amendments.
The city council further adopts the North Central Texas Council of Governments
Recommended Amendments, which are attached hereto as Attachment A and
incorporated herein for all purposes.
Sec. 3. Certification.
A certified energy inspector shall inspect all new construction, addition and alternations
and certify the structure is in compliance, prior to a certificate of occupancy. The builder
shall be responsible to obtain the certification from an accredited energy inspector, at his
cost, and show proof thereof, in a form acceptable to the mayor prior to issuance of the
certificate of occupancy.
Section 4 Repeal Clause
All parts of any ordinance in conflict with the provisions of this ordinance are to the
extent of such conflict hereby repealed.
Section 5 Savings Clause
If any provision of this ordinance shall be held to be invalid or unconstitutional, the
remainder of such ordinance shall continue in full force and effect the same as if such
invalid or unconstitutional provision had never been a part hereof.
Section 6 Effective Date
This ordinance shall be effective upon the posting andlor publication of its caption as
required by law and the City Secretary is hereby directed to implement such posting
and/or publication.
PASSED by the City Council of the City of Anna, Texas, this 10th day of January, 2006.
AYE 6 NAY 0 ABSTAIN 0
ATTESTED: APPROVED:
~atda Wilkison, City Secretary Mayor, Kenneth Pelham
ATTACHMENT A
Recommended Amendments to the
2003 lnternational 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.
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.
**Add the following section:
101.4.1.3 Alternative compliance. A buildinq certified by a national. state, or local accredited enerqv
efficiency proqram and determined by the Enerqv Systems Laboratory to be in compliance with the
enerqy efficiency requirements of this section may, at the o~tion of the Code Official, be considered in
compliance. The United States Environmental Protection Aqency's Enerqy Star Proqram certification of
enerqy code equivalency shall be considered in compliance.
(Reason: This amendment is added to allow alternative compliance in accordance with Texas HB 1365,
78'h Legislature.)
**Section 302.1; Replace blank Table 302.1 Exterior Design Conditions with the following:
**Delete note "a" and replace with the following:
. . - -
a. These values are from ASHRAE Handbook of Fundamentals for DallasIFt. Worth International Airport
99.6% Winter DB, 0.4% Summer DB, and 0.4% Summer WB; and from Local Climatolonical Data for
Dallas-Ft. Worth published by the National Climatic Data Center. National Oceanic and Atmospheric
Administration. These values are for the purpose of providinq a uniform basis of requirements for North
Central Texas. This will not preclude licensed professionals from submittinq desiqn analyses based on
site measurements or published data more specific to the buildinq site. Adiustments shall be permitted to
reflect local climates which differ from the tabulated values, or local weather experience determined by
the code official.
CONDITION
Winter a, design dry-bulb (OF) (99.6%)
Summera, design dry-bulb (OF) (0.4%)
Summera, design wet-bulb (OF) (0.4%)
Degree days heating
Degree days cooling
Climate zone
(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.)
VALUE
17
100
78
2407
2603
5 B
**Section 502.1.1; delete exception #2 and substitute the following:
2. Buildinqs 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.)
North Central Texas 1 March 2004
2003 IECC amendments
**Section 502.1.5; add the following exceptions:
Exceptions:
1. Anv alazinq facinq within 45 deqrees of true north;
2. Anv qlazinq facinq within 45 degrees of true south which is shaded alonq its full width by a
permanent overhanq with a proiection factor of 0.3 or qreater.
3. Anv fenestration with permanentlv attached screens where the screens have a rated shadinq
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'g
HEATING AND COOLING CRITERIA
**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 reqion.
Element
Walls
Rooflceiling
Floors over unheated
spaces
Heated slab on grade
Unheated slab on
grade
Basement wall
Crawl space wall
**Add Note "g":
a. These requirements applv onlv to the boundaries of conditioned space. Air conditioninq equipment
and ductwork is recommended, but not required, to be located within the conditioned space in North
Central Texas zones.
Mode
Heating or cooling
Heating or cooling
Heating or cooling
Heating
Heating
Heating or cooling
Heating or cooling
**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.)
ihdchgs Detached
One-Family Dwellings
uo
0.15
0.03
0.05
R-value = 6
R-value = 0
U-factor = 0.15
U-factor = 0.15
**Section 502.2; Add note to Fig 502.2(7):
All counties within the North Central Texas Council of Governments reqion are desiqnated as within the
area of vew heavv termite infestation probability for purpose of uniform interpretation of this requirement.
BMcWgs Detached
Two-Family Dwellings
uo
0.22
0.03
0.05
R-value = 6
R-value = 0
U-factor = 0.15
U-factor = 0.1 5
(Reason: This allows for uniform interpretation of the map throughout the area of the COG.)
North Central Texas
2003 IECC amendments
2 March 2004
***Section 502.2.2; add a second paragraph as follows:
A buildina demonstratinq envelope compliance at least 10% better than code may utilize R6 duct
insulation in both sup~lv and return air ducts in lieu of the insulation required bv 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
**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
%
Glazing
58%
21 2%
21 5%
21 8%
<20%
125%
(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.)
Maximum
Glazing
U-factor
0.70
0.65
0.60
0.52
0.50
0.46
Minimum
North Central Texas
2003 IECC amendments
%
Glazing
~20%
<25%
~30%
3 March 2004
Ceiling
R-value
R-26
R-26
R-30
R-30
R-38
R-38
Maximum
Glazing
U-factor
0.55
0.55
0.47
Minimum
Basement
wall
R-value
R-5
R-5
R-6
R-6
R-6
R-6
Exterior
wall
R-value
R-I I
R-13
R-13
R-13
R-13
R-16
Ceiling
R-value
R-30
R-30
R-38
Floor
R-value
R-I I
R-I I
R-19
R-19
R-19
R-19
Slab
perimeter
R-value
and
depth
R-0
R-0
R-0
R-0
R-0
R-0
Floor
R-value
R-I I
R-I I
R-19
Exterior
wall
R-value
R-13
R-13
R-13
Crawl
space
wall
R-value
R-6
R-5
R-7
R-7
R-7
R-7
Basement
wall
R-value
R-5
R-5
R-7
Slab
perimeter
R-value
and
depth
R-0
R-0
R-0
Crawl
space
wall
R-value
R-5
R-5
R-8
***Table 503.3.3.1 MINIMUM PIPE INSULATION. Amend footnote "a" to read as follows:
a. For piping lenaths in excess of five (5) feet exposed to outdoor air, increase the insulation
thickness by 0.5 inch.
(Reason: No performance data available, REMIRate 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 Sealinq required. All ioints, lonqitudinal and transverse seams, and connections in
ductwork, shall be made substantiallv airtiqht bv means of welds. qaskets, mastics (adhesives). mastic-
plus-embedded-fabric svstems or tapes or other approved closure svstems. {Remainder to remain
unchanaedi
(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. Anv nlazinq facinq within 45 deqrees of true north;
2. Anv qlazinq facinq within 45 deqrees of true south which is shaded alonq its full width by a
permanent overhanq with a proiection factor of 0.3 or qreater.
3. Any fenestration with attached screens where the screens have a rated shadinq 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.)
North Central Texas 4 March 2004
2003 IECC amendments
TABLE 802.2(1)
BUILDING ENVELOPE REQUIREMENTS
All-wood joist/truss
Concrete slab or deck
unconditioned space (R-value)
All-wood joisfftruss
Concrete slab or deck
North Central Texas
2003 IECC amendments
5 March 2004
TABLE 802.2(2)
BUILDING ENVELOPE REQUIREMENTS
North Central Texas 6 March 2004
2003 IECC amendments
TABLE 802.2(3)
BUILDING ENVELOPE REQUIREMENTS
2
letal fran
WINDOW AND GLAZED DOOR AREA OVER 25 PERCENT BUT NOT GREATER THAN 40
North Central Texas 7 March 2004
2003 IECC amendments
PERCENT OF
ELEMENT
Skylights (U-factor)
Slab or below-grade wall (R-value)
Windows and glass doors
PF < 0.25
0.25 5 PF < 0.50
PF 10.50
Roof assemblies (R-value)
All-wood joistltruss
Metal joistltruss
Concrete slab or deck
Metal purlin with thermal block
Metal purlin without thermal block
Floors over outdoor air or
unconditioned space (R-value)
All-wood joist/truss
Metal joistltruss
Concrete slab or deck
Above-grade walls (R-value)
Framed
R-value cavity
R-value continuous
CMU, > 8 in., with integral insulation
R-value cavity
R-value continuous
Other masonry walls
R-value cavity
R-value continuous
ABOVE-GRADE WALL AREA
CONDITIONNALUE
1
R-0
SHGC
0.4
0.5
0.6
Insulation between
framing
R-25
R-25
NA
R-30
X
Insulation between
framing
R-I I
R-I I
U-factor
0.7
0.7
0.7
Continuous insulation
R-I 9
R-20
R-I 9
R-20
R-20
Continuous insulation
R-6
R-6
NA R-6
No framing
NA
NA
NA
R-5
NA
R-5
N ling
R-I I
R-0
R-I I
R-0
R-I I
R-0
Wood framing
R-I I
R-0
R-I I
R-0
R-I I
R-0
TABLE 802.2(4)
BUILDING ENVELOPE REQUIREMENTS
***Add footnote "f" to SHGC column heading in Tables 802.2 (2), 802.2 (3) and 802.2 (4) to read as
follows:
All-wood joist/truss
Concrete slab or deck
unconditioned space (R-value)
All-wood joistltruss
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.
Concrete slab or deck
Above-grade walls (R-value)
Framed
R-value cavity
R-value continuous
CMU, 18 in., with integral insulation
R-value cavity
R-value continuous
Other masonry walls
R-value cavity
R-value continuous
(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:
Larqe soaces shall have a se~arate switch or control for each 2500 square feet of floor area.
N A
(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 ofice
spaces.)
North Central Texas 8 March 2004
2003 IECC amendments
R-6
No framing
NA
N A
NA, NA
R-5
N A
R-5
Metal framing
R-13
R-3
R-I I
R-0
R-I I
R-0
Wood framing
R-I I
R-0
R-I I
R-0
R-I I
R-0
*'~elete 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:
an I ~nni EE . . . .
ASHRAEIIES -- 99 Enerqv Efficient Desiqn of New Buildinqs EXC~D~ Low-Rise Residential Buildinqs
-- 1999 Edition
Chapter 10 - Referenced Standards: Under the heading ASHRAE and IESNA, change the Standard
Reference Number from 90.1 -2001 to 90.1 -1 999.
(Reason: This amendment is consistent with the Texas Building Energy Performance Standards.)
END
North Central Texas 9 March 2004
2003 IECC amendments