Residential_Energy_Efficiency_Requirements

Residential_Energy_Efficiency_Requirements - CHAPTER 4...

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Unformatted text preview: CHAPTER 4 RESIDENTIAL ENERGY EFFICIENCY SECTION 401 GENERAL 401.1 Scope. This chapter applies to residential buildings. 401.2 Compliance. Projects shall comply with Sections 401, 402.4, 402.5, and 403.1, 4032.2, 4032.3, and 403.3 through cies of heating, cooling and service water heating equipment. Where a gas—fired unvented room heater, electric furnace, or base- board electric heater is installed in the residence, the certificate shall list “gas-fired unvented room heater,” “electric furnace” or “baseboard electric heater,” as appropriate. An efficiency shall not be listed for gas—fired unvented room heaters, electric furnaces or electric baseboard heaters. 403.9 (referred to as the mandatory provisions) and either: 1. Sections 402.! through 402.3, 4032.1 and 404.1 (pre— scriptive); or SECTION 402 BUILDING THERMAL ENVELOPE 402.1 General (Prescriptive). 2. Section 405 (performance). 401.3 Certificate. A permanent certificate shall be posted on or in the electrical distribution panel. The certificate shall not cover or obstruct the visibility of the circuit directory label, service dis- connect label or other required labels. The certificate shall be completed by the builder or registered design professional. The certificate shall list the predominant R—values of insulation installed in or on ceiling/roof, walls, foundation (slab, basement wall, crawlspace wall and/or floor) and ducts outside condi‘ tioned spaces; U—factors for fenestration and the solar heat gain coefficient (SI-ICC) of fenestration. Where there is more than one value for each component, the certificate shall list the value cover— ing the largest area. The certificate shall list the types and efiicien— 402.1.1 Insulation and fenestration criteria. The building thermal envelope shall meet the requirements of Table 402.1.1 based on the climate zone specified in Chapter 3. 402.1.2 R-value computation. Insulation material used in layers, such as framing cavity insulation and insulating sheathing, shall be summed to compute the compOnent R—value. The manufacturer‘s settled R—value shall. be used for blown insulation. Computed R-values shall not include an R—value for other building materials or air films. TABLE 402.1.1 INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENT“ CRAWL ll wooo mass nasennarrc SLAB“ some“ FENESTRATION SKYLIGHT" FENESTFIATION CEILING FRAME WALL WALL FLOOR WALL R-VALUE WALL U-FACTOR" U—FACTOFI Iii-VALUE H-VALUE H-‘IMLUEl R—VALUE R-VALUE 8: DEPTH R-VALUE 13 3/4 13 0 0 l o 13 4/6 13 o 0 l 0 13 _ 5/8 19: 5/13f o l 5113 g; 13 5/10 19 4|, ill/l3 10,2ft ill/13 20 or 8+5" 305 10/13 10, 2 ft 10/13 -f 1 "a ...,_. 200r 13+5h 303_J 15/19 10,4n I 10113 21 331; 15/19 10,4n | 10/13 For SI: 1 foot = 304.8 mm. "l- a. R—vaiues are minimums. U’factors and SHGC are maximums. R— i 9 bans com ressed into a nominal 2 x 6framing cavity such that the R—val ue is reduced by Rwl or i p it more shall be marked with the compressed halt R-value in addition to the full thickness vaalue. b. The fenestration U—factor column excludes skylights. The SHGC column applies to all glazed fenestration. it c. “15/19” means R~15 continuous insulated sheathing on the interior or exteriorof the home or R-l9 cavity insulation at the interiorof the basement wall. “15119” tr: shall be permitted to bemet with RA 1 3cavity insulation on the interior of the hasernentwall plus 115 continuous insulated sheathing on the interior or exterior of the g: home. “10/ l 3” means R- lOcontinuous insulated sheathing on the interior orexterior of the home or R—l 3 cavity insulation at the interior of the basement wall. (1:. d. R-S shall be added to the required slab edge R—values for heated slabs. insulation depth shall be the depth of the footing or 2 feet, whichever is less in Zones 1 through 3 for heated slabs. There are no SHGC requirements in the Marine Zone. g: Basement wall insulation is not required in warmwhumid locations as defined by Figure 301.1 and Table 301.1. 0r insulatiOn sufficient to fill the framing cavity, R—l9 minimum. “13+5" means R-13 cavity insulation plus R-S insulated sheathing. If structural sheathing covers 25 percent or less of the exterior, insulating sheathing is not required where structural sheathing is used. If structural sheathing covers more than 25 percent of exterior, structural sheathing shall be supplemented with insu- lated sheathing of at least R—2. The second R-value applies when more than half the insulation is on the interior of the mass “all. j. For impact rated fenestration complying with Section 113012.12 of the International Residential Code or Section 1608.1 .2 of the International Building Code, the maximum U—factor shall be 0.75 in Zone 2 and 0.65 in Zone 3. 9'th |—. ‘7‘57M*’-‘*.‘ meow: I u—ule—I‘ I urn. hi‘lnl “a I 0.! r IUn—I‘U I ‘ TABLE 402.1.3 EQUIVALENT Lil-FACTORS“ CRAW L FRAME BASEMENT SPACE CUMATE FENESTHATI ON SKYLIGHT CEILING WALL MASS WALL FLOOR WALL WALL ZONE U—FACTOFI (II-FACTOR ill-FACTOR til-FACTOR U-FACTOH" U-FACTOH ill-FACTOR Ill-FACTOR“ 1 0-035 0064 0360 om 0.064 3 0.50 0.65 0.035 4 except Marine 0.35 0.60 0.030 r 0.360 0.047 0.091“ 0082 0141 0.047 0.059 , 0.065 wt 5 and Marine4 0.60 0.030 0.033 0.059 0.026 0.033 6 0.35 0.60 7 and 8 0.35 0.60 0.026 0.028 a. Nonfenestration U»factors shall be obtained from measurement, calculation or an approved source. b. When more than half the insulation is on the interior, the mass wall U-t‘actors shall he a maximum of 0.17 in Zone 1, 0.14 in Zone 2, 0.12 in Zone 3, 0:10 in Zone 4 except Marine, and the same as the frame wall U—factor in Marine Zone 4 and Zones 5 through 8. c. Basement wall U-factor of 0.360 in warm—humid locations as defined by Figure 301.1 and Table 301.2. 4.02.1.3 U—factor alternative. An assembly with a U-fac~ tor equal to or less than that specified in Table 402.1.3 shall be permitted as an alternative to the R~value in Table 402.1.1. 402.1.4 Total UA alternative. If the total building thermal envelope UA (sum of U—factor times assembly area) is less than or equal to the total UA resulting from using the U—factors in Table 402.1.3 (multiplied by the same assem- bly area as in the proposed building), the building shall be considered in compliance with Table 402.1- 1. The UA cal— culation shall be done using a method consistent with the ASHRAE Handbook of Fundamentals and shall include the thermal bridging effects of framing materials. The SHGC requirements shall be met in addition to UA com- pliance. 402.2 Specific insulation requirements (Prescriptive). 402.2.1 Ceilings with attic spaces. When Section 402.1.1 would require R~38 in the ceiling, R—30 shall be deemed to satisfy the requirement for R~38 wherever the full height of uncompressed 11—30 insulation extends over the wall top plate at the eaves. Similarly, R—SS shall be deemed to satisfy the requirement for 11-49 wherever the full height of uncom— pressed R~38 insulation extends over the wall top plate at the eaves. This reduction shall not apply to the U—factor alterna~ tive approach in Section 402.13 and the total UA alternative in Section 402.1.4. 402.2.2 Ceilings without attic spaces. Where Section 402.1,! would require insulation levels above R-30 and the design of the roof/ceiling assembly does not allow sufficient space for the required insulation, the minimum required insulation for such roof/ceiling assemblies shall be R30. This reduction of insulation from the requirements of Sec» 28 don 402.1.1 shall be limited to 500 square feet (46 m2) or 20 percent of the total insulated ceiling area, whichever is less. This reduction shall not apply to the U—factor alternative approach in Section 402.13 and the total UA alternative in Section 4021.4. 402.23 Access hatches and doors. Access doors from conditioned spaces to unconditioned spaces (e.g., attics and crawl spaces) shall be weatherstripped and insulated to a level equivalent to the insulation on the surrounding sur- faces. Access shall be provided to all equipment that pre- vents damaging or compressing the insulation. A wood framed or equivalent baffle or retainer is required to be provided when loose fill insulation is installed, the purpose of which is to prevent the loose fill insulation from spilling into the living space when the attic access is opened, and to provide a permanent means of maintaining the installed R—value of the loose fill insulation. 402.2.4 Mass walls. Mass walls for the purposes of this chapter shall be considered above-grade walls of concrete block, concrete, insulated concrete form (ICF), masonry cavity, brick (other than brick veneer), earth (adobe, com pressed earth block, rammed earth) and solid timber/logs. 402.2.5 Steel-frame ceilings, walls, and floors. Steel- frarne ceilings, walls and floors shall meet the insulation requirements of Table 402.25 or shall meet the U—factot' requirements in Table 402.1.3. The calculation of the U—fac- tor for a steehframe envelope assembly shall use a series— parallel path calculation method. Exception: In Climate Zones 1 and 2, the continuous insulation requirements in Table 402.2.4 shall be permit- ted to be reduced to R~3 for steel frame wall assemblies with studs spaced at 24 inches (610 mm) on center. 2009 INTERNATIONAL ENERGY CONSERVATION c0053 .3 -i .g ' 2.! ...
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Residential_Energy_Efficiency_Requirements - CHAPTER 4...

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