ORD 2020-010 2018-2020 - Laserfiche WebLink

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Attic and other R-30 or R-19 with cool roof R-30 or R-19 with cool roof Walls, above grade Mass R-5.7cid R-5.7cid Metal building R-13 + R-6.5ci R-13 +R-6.5ci Metal framed R-13 +R-5ci R-13 + R-5ci Wood framed and other R-13 + R-3.8ci or R-20 R-13 +R-3.8ci or R-20 Walls, below grade Below-grade wall NR NR Floors Mass NR NR Joist/framing NR NR Slab-on-grade floors Unheated slabs NR NR Heated slabs R-7.5 for 12"below R-7.5 for 12" below Opaque doors Nonswinging R-4.75 R-4.75 For SI: 1 inch=25.4 mm, 1 pound per square foot=4.88 kg/m2, 1 pound per cubic foot= 16 kg/m3. ci=Continuous insulation,NR=No requirement,LS=Liner system. a. Assembly descriptions can be found inANSI/ASHRAE/IESNA Appendix A. b. Where using R-value compliance method, a thermal spacer block shall be provided,otherwise use the U-factor compliance method in Table C402.1.4. c. Cool roof is defined as a roof with three-year aged solar reflectance of 0.55 and 3-year aged thermal emittance of 0.75 or 3-year aged solar reflectance index of 64. d. R-5.7ci is allowed to be substituted with concrete block walls complying with ASTM C 90, ungrouted or partially grouted at 32 inches or less on center vertically and 48 inches or less on center horizontally,with ungrouted cores filled with materials having maximum thermal conductivity of 0.44 Btu-in/h-f2°F. See Section C402.2.3." (10) Subsection C402.2.3 of the International Energy Conservation Code is amended to read as follows: "C402.2.3 Thermal resistance of above-grade walls. The minimum thermal resistance (R-value) of materials installed in the wall cavity between framing members and continuously on the walls shall be as specified in Table C402.1.3, based on framing type and construction materials used in the wall assembly. 7