WAC 51-11C-610225. Tables A102.2.5 — Default U-factors for metal building roofs

Table A102.2.5 Default U-factors for Metal Building Roofs Overall U-Factor for Assembly of Base Roof Plus Continuous Insulation (uninterrupted by framing) Rated R-Value of Continuous Insulation Insulation System Rated R-Value of Insulation Overall U-Factor for Entire Base Roof Assembly R-6.5 R-13 R-19.5 R-26 R-32.5 R-39 Standing Seam Roofs with Thermal Spacer Blocks a, b None 1.280 0.137 0.073 0.049 0.037 0.030 0.025 R-10 0.115 0.066 0.046 0.035 0.029 0.024 0.021 Single R-11 0.107 0.063 0.045 0.035 0.028 0.024 0.021 Layer R-13 0.101 0.061 0.044 0.034 0.028 0.024 0.020 R-16 0.096 0.059 0.043 0.033 0.027 0.023 0.020 R-19 0.082 0.053 0.040 0.031 0.026 0.022 0.020 R-10 + R-10 0.088 0.056 0.041 0.032 0.027 0.023 0.020 R-10 + R-11 0.086 0.055 0.041 0.032 0.027 0.023 0.020 R-11 + R-11 0.085 0.055 0.040 0.032 0.026 0.023 0.020 R-10 + R-13 0.084 0.054 0.040 0.032 0.026 0.023 0.020 Double R-11 + R-13 0.082 0.053 0.040 0.032 0.026 0.022 0.020 Layer R-13 + R-13 0.075 0.050 0.038 0.030 0.025 0.022 0.019 R-10 + R-19 0.074 0.050 0.038 0.030 0.025 0.022 0.019 R-11 + R-19 0.072 0.049 0.037 0.030 0.025 0.022 0.019 R-13 + R-19 0.068 0.047 0.036 0.029 0.025 0.021 0.019 R-16 + R-19 0.065 0.046 0.035 0.029 0.024 0.021 0.018 R-19 + R-19 0.060 0.043 0.034 0.028 0.023 0.020 0.018 Liner R-19 + R-11 0.035 System R-25 + R-11 0.031 R-30 + R-11 0.029 R-25 + R-11 + R-11 0.026 Filled Cavity with Thermal Spacer Blocks c R-10 + R-19 0.057 0.042 0.033 0.027 0.023 0.020 0.018 Standing Seam Roofs without Thermal Spacer Blocks Liner System R-19 + R-11 0.040 Thru-Fastened Roofs without Thermal Spacer Blocks Single R-10 0.184 Layer R-11 0.182 R-13 0.174 R-16 0.157 R-19 0.151 Liner System R-19 + R-11 0.044 Overall U-Factor for Assembly of Base Roof Plus Continuous Insulation (uninterrupted by framing) Rated R-Value of Continuous Insulation Insulation System Rated R-Value of Insulation Overall U-Factor for Entire Base Roof Assembly R-6.5 R-13 R-19.5 R-26 R-32.5 R-39 Standing Seam Roofs with Thermal Spacer Blocks a, b None 1.280 0.137 0.073 0.049 0.037 0.030 0.025 R-10 0.115 0.066 0.046 0.035 0.029 0.024 0.021 Single R-11 0.107 0.063 0.045 0.035 0.028 0.024 0.021 Layer R-13 0.101 0.061 0.044 0.034 0.028 0.024 0.020 R-16 0.096 0.059 0.043 0.033 0.027 0.023 0.020 R-19 0.082 0.053 0.040 0.031 0.026 0.022 0.020 R-10 + R-10 0.088 0.056 0.041 0.032 0.027 0.023 0.020 R-10 + R-11 0.086 0.055 0.041 0.032 0.027 0.023 0.020 R-11 + R-11 0.085 0.055 0.040 0.032 0.026 0.023 0.020 R-10 + R-13 0.084 0.054 0.040 0.032 0.026 0.023 0.020 Double R-11 + R-13 0.082 0.053 0.040 0.032 0.026 0.022 0.020 Layer R-13 + R-13 0.075 0.050 0.038 0.030 0.025 0.022 0.019 R-10 + R-19 0.074 0.050 0.038 0.030 0.025 0.022 0.019 R-11 + R-19 0.072 0.049 0.037 0.030 0.025 0.022 0.019 R-13 + R-19 0.068 0.047 0.036 0.029 0.025 0.021 0.019 R-16 + R-19 0.065 0.046 0.035 0.029 0.024 0.021 0.018 R-19 + R-19 0.060 0.043 0.034 0.028 0.023 0.020 0.018 Liner R-19 + R-11 0.035 System R-25 + R-11 0.031 R-30 + R-11 0.029 R-25 + R-11 + R-11 0.026 Filled Cavity with Thermal Spacer Blocks c R-10 + R-19 0.057 0.042 0.033 0.027 0.023 0.020 0.018 Standing Seam Roofs without Thermal Spacer Blocks Liner System R-19 + R-11 0.040 Thru-Fastened Roofs without Thermal Spacer Blocks Single R-10 0.184 Layer R-11 0.182 R-13 0.174 R-16 0.157 R-19 0.151 Liner System R-19 + R-11 0.044 (Multiple R-values are listed in order from inside to outside) a A standing seam roof clip that provides a minimum 1.5 inch distance between the top of the purlins and the underside of the metal roof panels is required. b A minimum R-3 thermal spacer block is required. c A minimum R-5 thermal spacer block is required.