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Home My WebLink AboutOrd 2002-20 Adopt Int Energy Code W Amendments.pdfCITY OF ANNA, TEXAS ORDINANCE NO. 2002-20 AN ORDINANCE OF THE CITY OF ANNA, TEXAS, ADOPTING THE INTERNATIONAL ENERGY CODE; ADOPTING THE NORTH CENTRAL TEXAS COUNCIL OF GOVERNMENTS RECOMMENDED AMENDMENTS; 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 City does not currently have an energy code; 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 International 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 CITY COUNCIL OF THE CITY OF ANNA, TEXAS: Section 1. International Energy Conservation Code adopted. The city council hereby adopts the International 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 International Energy Conservation Code, as adopted herein and as amended, by no later than September 1, 2002. 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 Page 1 of 2 ENERGY CODE 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 and/or 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 13th day of August, 2002. APPROVED: ATTESTED: Page 2 of 2 C:Oocuments and SettingsW UsemOocumentslAnna MghBudding CodesW-Energy Code.doc 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, and -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 program 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', desi n wet -bulb 'F 0.4% 78 De ree da s heatin 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. 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 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 proiection 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 502.23'9 HEATING AND COOLING CRITERIA Element Mode Type A-1 Residential Buildings U. Type A-2 Residential Buildings 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 rade Heating R -value = 0 R -value = 0 Basementwall Heatingor cooling U-factor=0.15 U -factor = 0.15 Crawls ace wall Heatin or coolin9 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 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) "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 Gtaztrtg .....,... Glazing U -factor Ceiling R -value Exterior Floor wall R -value R -value Basement Slab wall perimeter R -value R -value and depth Crawl space wall R -value =<8°Jn Ji 0.70 R-26 R-11 R-11 R-5 R-0 R-6 ..:................... .. 0.65 R-26 R-13 R-11 R-5 R-0 R-5 0.65R-30 R-13 R-11 R-6 R-0 R-7 xft "" 0.52 R-30 R-13 R-19 R-6 R-0 R-7 and 0.50 R-38 R-13 R-19 R-6 R-0 R-7 '-" 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 taztm} 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 0.55 R-30 R-13 R-11 R-5 R-0 R-6 0.55 R-30 R-13 R-11 R-5 R-0 R-5 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 wg (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. High pressure and :^c•':..:^ ; rccc_re Ducts operating at static pressures in excess of 3 in. w.q. 750 Pal shall be leak tested in accordance with eneACnln uver Ak n of I e. kage Test Man. Al with Fate of ..'• leakage not to exceed the ro.. 'm m rate specified e:n thAt etAAd AFd ... _...-_....�_ .._..- -..---- ..._ ..._::...._....-.-......----_.._---. Section 803.3.6. Pressun 503.3.3.4.2 Low pressure duct systems. All longitudinal and transverse joints, seams and connections of law„ressure upply and return ducts operating at static pressures less than or equal to 2 in. w.g. (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 CONDITIONIVALUE Zones 5B,6B 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 An Any An Any An 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) AII-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 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 CONDITIONIVALUE 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 An 0.25 < PF < 0.50 0.7 An PF > 0.50 Any An Roof assemblies (R -value) Insulation between Continuous insulation framing All -wood joist/truss R-25 R-19 Metal joistttruss 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 cavil NA R-11 R-11 R -value continuous NA R-0 R-0 CMU, > 8 in., with integral insulation R -value cavity NA RA 1 R-11 R -value continuous R-5 R-0 R-0 Other masonry walls R -value cavil 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 CONDITIONNALUE Skylights (U -factor) 1 Slab or below rade 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 Continuous insulation framing 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 Continuous insulation framing R-11 R-6 R-11 R-6 NA R-6 Above -grade walls(R-value) No framing Metal framing Wood framing Framed -value cavil NA R-11 R-11 —R -value continuous NA R-0 R-0 —R CMU, > 8 in., with integral insulation R -value cavil NA R-11 R-11 R -value continuous R-5 R-0 R-0 Other mason walls R -value cavil 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 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 rade 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: ecuononoc 90 .4 49Rn with RA,.,i..:...,1 thRl OGtGbeF 7, 4997 lRGlUding FFrat. 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