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Home My WebLink AboutB15-0011_IECC R and U Value Tables noted_1425421500.pdf n TABLE C402.2 N OPAQUE THERMAL ENVELOPE REQUIREMENTS° 0 1 2 3 4 EXCEPT MARINE 5 AND MARINE 4 6 7 8 3 CLIMATE ZONE All Other Group R All Other Group R All Other Group R All Other Group R All Other Group R All Other Group R All Other I Group R All Other Group R n Roofs D r- Insulutian c•tl ly R-2Cd R-23,:1 R-20d R-20d R-23d R-20c1 R-25d R-25d R-25c1 R-25d R-30ci R-30d R-35ci R-35c1 R-35ci R-35c1 m above d,.ck Z rn Metal b:'?1_,gs R-19+ R-19+ R-19+ R-19+ R-19+ R-19+ R 19+ R-19+ R-19+ R-19+ R-25+ R-25+ R-30+ R-30+ R-30+ R-30+ 0 (with R-5 0�cimal blocks) n R-11 LS R-11 LS R11 LS R-11 LS R-11 LS R-11 LS R-11 LS R-11 LS R-11 LS R-11 LS R-11 LS R-11 LS R-11 LS R-11 LS R-11 LS R-11 LS m m Attic a-9d c•.'a R-38 R-38 R-38 R-38 R-38 R-38 R-38 R-38 R-38 R-49 R-49 R-49 R-49 R-49 R-49 R-49 0 n Walls,Above Grade Z Mass R-5.7c1 R-5.7ci R-5.7d R-7.6ci R-7.6ci R-9.5cI R-9.5ci R-11.4c1 R-11.4c1 R-13.3ci R-13.3c1' R-15.2c1 R-15.2d R-15.2c1 R-25c1 R-25d < Metal building R-13+ R-13+ R13+ R-13+ R-13+ R-13+ R-13+ R-13+ R-13+ R-13+ R-13+ R-13+ R-13+ R-13+ R-13+ R-13+ R-6.5c1 R-6.5c1 R-6.5ci R-13ci R-6.5c1 R-13ci R-13cI R-13ci R-13d R-13c1 R-13ci R-13c1 R-13c1 R-19.5c1 R-13c1 R-19.5d Metal framed R-13+ R-13+ R-13+ R-13+ R 13+ R-13+ R-13+ R-13+ R-13+ R-13+ - R-13+ R-13+ R-13+ R-13+ R-I3+ R-13+ R-5d R-5ci R-5c1 R-7.5ci R-7.5r1 R-7.5ci R-7.5ci R-7.5d R-7.5d R-7.5d R-7.5ci R-7.5d R-7.5c1 R-116d R-7.5c1 R17.5ci R-13+ R-13+ R-13+ R-13+ R-13+ R-13+ R-13+ R-13+ R-13+ R-13+ R-13+ R-I3+ R13+ R-13+ R-13+ R-13+ Wood frnmc l andR-3.8d or R-3.8d or R-3.8ci or R-3.851 or R-3.8cl or R-3.8x1 or R-3.8d ar R-3.8ci or R-3.8d or R-7.5d or R-7.55 i or R-7.5d or R-7.5d or R-7.5d or R-15.6ci R-15.6d other R-20 R-23 R-20 R-20 R-20 R-23 1 R-20 R-20 R-20 R-20+ R-20+ R-20+ R-20+ R-20+ or R-20+ or R-20+ R•3.8c1 R-3.851 R-3.8c1 R-3.8c1 R-3.851 R-10d R-10d Walls,Below Grade Below-grade wall° NR NR NR NR NR NR R-7.551 R-7.551 R-7.5d R-7.551 R-7.5ci J R-7.5c1 R-10d R-10d R-1051 j R-12.5c1 Floors Mass NR NR R-6.351 R-8.351 R-1051 R-1051 R-1051 R-10.4c1 R-10d R-12.5c1 R-12.5ci R-12.551 R-15c1 R-16.7c1 R-15c1 R-16.7d Joist/framing NR NR R-30 R-30 R-30 R-30 R-30 R-30 R-30 R-30 R-30 R-30' R-30'J R-30' R-30' R-30' IEl Slab-on-Grade Floors " Unheated slabs NR NR NR AR NR NR R-10 for R-10 for R-10 for R-10 for R-10 for R-15 for R-15 for R-15 for R-15 for R-20 for z 24"below 24"below 24"below 24"below 24"below 24"below 24"below 24"below 24"below 24"below Z Heated slabs° R-7.5 for R-7.5 for R-7.5 for R-7.5 or R-10 for R-10 for R-15 for R-15 for R-15 for R-15 for •R-15 for R-20 for R-20 for R-20 for R-20 for R-20 for 12"below 12"below 12"below 12"below 24"below 24"below 24"below 24"below 36"below 36"below 36 below 48"below 24"below 48 below 48"below 48"below a --i Opaque Doors Z Swinging U-0.61 U-0.61 U-0.61 U-0.61 U-0.61 U-0.61 U-0.61 U-0.61 U-0.37 U-0.37 U-0.37 U-0.37 U-0.37 U-0.37 U-0.37 U-0.37 ✓ Roll-up or sliding R-4.75 R-4.75 R-4.75 R-4.75 R-4.75 R-4.75 R-4.75 R-4.75 R-4.75 R-4.75 R-4.75 R-4.75 R4.75 R-4.75 R-4.75 R-4.75 PI Z For SI: 1 inch=25.4 mm. ci=Continuous insulation. NR=No requirement. 0 LS=Liner System-A continuous membrane installed below the purlins and uninterrupted by framing members.Uncompressed,unfaced insulation rests on top of the membrane between the purlins. '< a. Assembly descriptions can be found in ANSI/ASHRAE/IESNA Appendix A. O b.Where using R-value compliance method,a thermal spacer block shall be provided,otherwise use the U-factor compliance method in Table C402.1.2. y c. R-5.7c1 is allowed to be substituted with concrete block walls complying with ASTM C 90,ungrouted or partially grouted at 32 Inches or less on cents r vertically and 48 inches or less on center horizontally, in with ungrouted cores filled with materials having a maximum thermal conductivity of 0.44 Btu-in/h-e°F. • d.Where heated slabs are below grade,below grade walls shall comply with the exterior insulation requirements for heated slabs. -t e. Steel floor joist systems shall be insulated to R-38. 0 Z C) 0 0 m COMMERCIAL ENERGY EFFICIENCY C402.3 Fenestration(Prescriptive).Fenestration shall corn- and shall provide a minimum skylight area to daylight ply with Table C402.3.Automatic daylighting controls sped- zone under skylights of either: fled by this section shall comply with Section C405.2.2.3.2. 1. Not less than 3 percent with a skylight VT of at least C402.3.1 Maximum area.The vertical fenestration area(not 0.40;or including opaque doors and opaque spandrel panels) shall 2. Provide a minimum skylight effective aperture of at not exceed 30 percent of the gross above-grade wall area. least 1 percent determined in accordance with Equa- The skylight area shall not exceed 3 percent of the gross roof tion 4-1. area. C402.3.1.1 Increased vertical fenestration area with Skylight Effective Aperature = 0.85 x Skylight Area x x WF Daylight zone undderer s skyylili VTght daylighting controls. In Climate Zones 1 through 6,a maximum of 40 percent of the gross above-grade wall (Equation 4-1) area shall be permitted to be vertical fenestration, pro- vided: where: 1. No less than 50 percent of the conditioned floor Skylight area = Total fenestration area of area is within a daylight zone; skylights. 2. Automatic daylighting controls are installed in Skylight VT = Area weighted average visible daylight zones;and transmittance of skylights. 3. Visible transmittance (VT) of vertical fenestra- WF = Area weighted average well tion is greater than or equal to 1.1 times solar heat factor, where well factor is 0.9 gain coefficient(SHGC). if light well depth is less than 2 feet (610 mm), or 0.7 If light Exception: Fenestration that is outside the scope well depth is 2 feet(610 mm)or of NFRC 200 is not required to comply with Item greater. 3. Light well depth = Measure vertically from the C402.3.1.2 Increased skylight area with daylighting underside of the lowest point of controls. The skylight area shall be permitted to be a the skylight glazing to the maximum of 5 percent of the roof area provided auto- ceiling plane under the matic daylighting controls are installed in daylight skylight. zones under skylights. Exception: Skylights above daylight zones of enclosed C402.3.2 Minimum skylight fenestration area. In an spaces are not required in: enclosed space greater than 10,000 square feet (929 m9, 1. Buildings climate zones 6 through 8. directly under a roof with ceiling heights greater than 15 g g feet(4572 mm),and used as an office,lobby,atrium,con- 2. Spaces where the designed general lighting power course,corridor,storage,gymnasium/exercise center,con- densities are less than 0.5 W/ft2(5.4 W/m2). vention center, automotive service, manufacturing, non- 3. Areas where it is documented that existing struc- refrigerated warehouse, retail store, distribution/sorting tures or natural objects block direct beam sun- area, transportation, or workshop, the total daylight zone light on at least half of the roof over the enclosed under skylights shall be not less than half the floor area TABLE C402.3 BUILDING ENVELOPE REQUIREMENTS:FENESTRATION CLIMATE ZONE 1 2 3 4 EXCEPT MARINE 5 AND MARINE 4 6 7 8 Vertical fenestration U-factor Fixed fenestration 0.50 0.50 0.46 0.38 0.38 0.36 0.29 0.29 Operable fenestration 0.65 0.65 0.60 0.45 0.45 0.43 0.37 0.37 Entrance doors 1.10 0.83 0.77 0.77 0.77 0.77 0.77 0.77 SHGC SHGC 0.25 0.25 0.25 0.40 0.40 0.40 0.45 0.45 Skylights U-factor 0.75 0.65 0.55 0.50 0.50 0.50 0.50 0.50 • SHGC 0.35 0.35 0.35 0.40 0.40 0.40 NR NR NR=No requirement. 2012 INTERNATIONAL ENERGY CONSERVATION CODES C•33