WAC 51-11C-610226. Tables A102.2.6 — Assembly U-factors for roofs with insulation entirely above deck

Table A102.2.6(1) Assembly U-factors for Roofs with Tapered Insulation Entirely Above Deck Single Slope Rectangular to One-side d,e,f,g,h (Uninterrupted by Framing) Rated R-value of Insulation at Maximum Condition (Rmax c ) 1 5 10 15 20 25 30 35 40 45 50 55 60 Rated R-value of insulation at a Minimum Condition (Rmin b ) 1 0.562 0.306 0.213 0.168 0.140 0.121 0.107 0.097 0.088 0.081 0.075 0.070 0.066 5 - 0.173 0.125 0.101 0.086 0.076 0.068 0.062 0.057 0.053 0.049 0.046 0.044 10 - - 0.093 0.076 0.066 0.058 0.053 0.048 0.045 0.042 0.039 0.037 0.035 15 - - - 0.063 0.055 0.049 0.045 0.041 0.038 0.036 0.034 0.032 0.030 20 - - - - 0.048 0.043 0.039 0.036 0.034 0.032 0.030 0.028 0.027 25 - - - - - 0.039 0.035 0.033 0.031 0.029 0.027 0.026 0.025 30 - - - - - - 0.032 0.030 0.028 0.026 0.025 0.024 0.023 35 - - - - - - - 0.028 0.026 0.025 0.023 0.022 0.021 40 - - - - - - - - 0.025 0.023 0.022 0.021 0.020 45 - - - - - - - - - 0.022 0.021 0.020 0.019 50 - - - - - - - - - - 0.020 0.019 0.018 55 - - - - - - - - - - - 0.018 0.017 60 - - - - - - - - - - - - 0.016 Rated R-value of Insulation at Maximum Condition (Rmax c ) 1 5 10 15 20 25 30 35 40 45 50 55 60 Rated R-value of insulation at a Minimum Condition (Rmin b ) 1 0.562 0.306 0.213 0.168 0.140 0.121 0.107 0.097 0.088 0.081 0.075 0.070 0.066 5 - 0.173 0.125 0.101 0.086 0.076 0.068 0.062 0.057 0.053 0.049 0.046 0.044 10 - - 0.093 0.076 0.066 0.058 0.053 0.048 0.045 0.042 0.039 0.037 0.035 15 - - - 0.063 0.055 0.049 0.045 0.041 0.038 0.036 0.034 0.032 0.030 20 - - - - 0.048 0.043 0.039 0.036 0.034 0.032 0.030 0.028 0.027 25 - - - - - 0.039 0.035 0.033 0.031 0.029 0.027 0.026 0.025 30 - - - - - - 0.032 0.030 0.028 0.026 0.025 0.024 0.023 35 - - - - - - - 0.028 0.026 0.025 0.023 0.022 0.021 40 - - - - - - - - 0.025 0.023 0.022 0.021 0.020 45 - - - - - - - - - 0.022 0.021 0.020 0.019 50 - - - - - - - - - - 0.020 0.019 0.018 55 - - - - - - - - - - - 0.018 0.017 60 - - - - - - - - - - - - 0.016 Table A102.2.6(2) Assembly U-factors for Roofs with Tapered Insulation Entirely Above Deck Sloped Triangle (Roof with Center Drain) e,f,g,h,i (Uninterrupted by Framing) Rated R-value of Insulation at Maximum Condition (Rmax c ) 1 5 10 15 20 25 30 35 40 45 50 55 60 Rated R-value of insulation at a Minimum Condition (Rmin b ) 1 0.526 0.242 0.146 0.106 0.083 0.068 0.058 0.051 0.045 0.040 0.036 0.033 0.031 5 - 0.173 0.112 0.084 0.068 0.057 0.049 0.044 0.039 0.035 0.032 0.030 0.028 10 - - 0.093 0.071 0.059 0.050 0.044 0.039 0.035 0.032 0.029 0.027 0.025 15 - - - 0.063 0.053 0.045 0.040 0.035 0.032 0.029 0.027 0.025 0.023 20 - - - - 0.048 0.042 0.037 0.033 0.030 0.027 0.025 0.024 0.022 25 - - - - - 0.039 0.034 0.031 0.028 0.026 0.024 0.022 0.021 30 - - - - - - 0.032 0.029 0.027 0.025 0.023 0.021 0.020 35 - - - - - - - 0.028 0.026 0.024 0.022 0.021 0.019 40 - - - - - - - - 0.025 0.023 0.021 0.020 0.019 45 - - - - - - - - - 0.022 0.020 0.019 0.018 50 - - - - - - - - - - 0.020 0.018 0.017 55 - - - - - - - - - - - 0.018 0.017 60 - - - - - - - - - - - - 0.016 Rated R-value of Insulation at Maximum Condition (Rmax c ) 1 5 10 15 20 25 30 35 40 45 50 55 60 Rated R-value of insulation at a Minimum Condition (Rmin b ) 1 0.526 0.242 0.146 0.106 0.083 0.068 0.058 0.051 0.045 0.040 0.036 0.033 0.031 5 - 0.173 0.112 0.084 0.068 0.057 0.049 0.044 0.039 0.035 0.032 0.030 0.028 10 - - 0.093 0.071 0.059 0.050 0.044 0.039 0.035 0.032 0.029 0.027 0.025 15 - - - 0.063 0.053 0.045 0.040 0.035 0.032 0.029 0.027 0.025 0.023 20 - - - - 0.048 0.042 0.037 0.033 0.030 0.027 0.025 0.024 0.022 25 - - - - - 0.039 0.034 0.031 0.028 0.026 0.024 0.022 0.021 30 - - - - - - 0.032 0.029 0.027 0.025 0.023 0.021 0.020 35 - - - - - - - 0.028 0.026 0.024 0.022 0.021 0.019 40 - - - - - - - - 0.025 0.023 0.021 0.020 0.019 45 - - - - - - - - - 0.022 0.020 0.019 0.018 50 - - - - - - - - - - 0.020 0.018 0.017 55 - - - - - - - - - - - 0.018 0.017 60 - - - - - - - - - - - - 0.016 Table A102.2.6(3) Assembly U-factors for Roofs with Tapered Insulation Entirely Above Deck Sloped Triangle (Roof with Perimeter Drains) e,f,g,h,i (Uninterrupted by Framing) Rated R-value of Insulation at Maximum Condition (Rmax c ) 1 5 10 15 20 25 30 35 40 45 50 55 60 Rated R-value of insulation at a Minimum Condition (Rmin b ) 1 0.562 0.242 0.146 0.106 0.083 0.068 0.058 0.051 0.045 0.040 0.036 0.033 0.031 5 - 0.173 0.122 0.084 0.068 0.057 0.049 0.044 0.039 0.035 0.032 0.030 0.028 10 - - 0.093 0.071 0.059 0.050 0.044 0.039 0.035 0.032 0.029 0.027 0.025 15 - - - 0.063 0.053 0.045 0.040 0.035 0.032 0.029 0.027 0.025 0.024 20 - - - - 0.048 0.042 0.037 0.033 0.030 0.027 0.025 0.024 0.022 25 - - - - - 0.039 0.034 0.031 0.028 0.026 0.024 0.022 0.021 30 - - - - - - 0.032 0.029 0.027 0.025 0.023 0.021 0.020 35 - - - - - - - 0.028 0.026 0.024 0.022 0.021 0.019 40 - - - - - - - - 0.025 0.023 0.021 0.020 0.019 45 - - - - - - - - - 0.022 0.020 0.019 0.018 50 - - - - - - - - - - 0.020 0.018 0.017 55 - - - - - - - - - - - 0.018 0.017 60 - - - - - - - - - - - - 0.016 Rated R-value of Insulation at Maximum Condition (Rmax c ) 1 5 10 15 20 25 30 35 40 45 50 55 60 Rated R-value of insulation at a Minimum Condition (Rmin b ) 1 0.562 0.242 0.146 0.106 0.083 0.068 0.058 0.051 0.045 0.040 0.036 0.033 0.031 5 - 0.173 0.122 0.084 0.068 0.057 0.049 0.044 0.039 0.035 0.032 0.030 0.028 10 - - 0.093 0.071 0.059 0.050 0.044 0.039 0.035 0.032 0.029 0.027 0.025 15 - - - 0.063 0.053 0.045 0.040 0.035 0.032 0.029 0.027 0.025 0.024 20 - - - - 0.048 0.042 0.037 0.033 0.030 0.027 0.025 0.024 0.022 25 - - - - - 0.039 0.034 0.031 0.028 0.026 0.024 0.022 0.021 30 - - - - - - 0.032 0.029 0.027 0.025 0.023 0.021 0.020 35 - - - - - - - 0.028 0.026 0.024 0.022 0.021 0.019 40 - - - - - - - - 0.025 0.023 0.021 0.020 0.019 45 - - - - - - - - - 0.022 0.020 0.019 0.018 50 - - - - - - - - - - 0.020 0.018 0.017 55 - - - - - - - - - - - 0.018 0.017 60 - - - - - - - - - - - - 0.016 Footnotes to Tables A102.2.6(1), A102.2.6(2), and A102.2.6(3): a R max and R min are determined along the linearly tapered cross section for the 6. respective minimum and maximum thickness values for the roof section being analyzed. For triangular roof sections. b R max refers to the insulation value along the long edge of the triangle and R min to the insulation at the point of the triangle which assumes that the insulation slopes to the center. c R max refers to the insulation value at the point of the triangle and R min to the insulation along the long edge of the triangle which assumes that the insulation slopes to the perimeter. d Effective U-factor for rectangular tapered insulation is calculated as follows: Footnotes to Tables A102.2.6(1), A102.2.6(2), and A102.2.6(3): a R max and R min are determined along the linearly tapered cross section for the 6. respective minimum and maximum thickness values for the roof section being analyzed. For triangular roof sections. b R max refers to the insulation value along the long edge of the triangle and R min to the insulation at the point of the triangle which assumes that the insulation slopes to the center. c R max refers to the insulation value at the point of the triangle and R min to the insulation along the long edge of the triangle which assumes that the insulation slopes to the perimeter. d Effective U-factor for rectangular tapered insulation is calculated as follows: R eff = R max – R min Ln[R max /R min ] R eff = R max – R min Ln[R max /R min ] e Effective U-factor for triangular tapered insulation is calculated as follows: R eff = [2/(R max – R min ) [1 + (R min /R max – R min )ln(R min /R max )]] -1 f Assembly U-factors include an exterior air film (R=0.17) and an interior air film, horizontal with heat flow up (R=0.61). g For effective U-factors of roof assemblies with different R max or R min values not listed in the tables interpolation is allowed. h This table shall only be applied to tapered insulation that is tapered along only one axis. i In areas of differing insulation slopes/configurations, individual U-values shall be calculated and an area weighted U-value calculation shall be used to determine the effective value of the roof. e Effective U-factor for triangular tapered insulation is calculated as follows: R eff = [2/(R max – R min ) [1 + (R min /R max – R min )ln(R min /R max )]] -1 f Assembly U-factors include an exterior air film (R=0.17) and an interior air film, horizontal with heat flow up (R=0.61). g For effective U-factors of roof assemblies with different R max or R min values not listed in the tables interpolation is allowed. h This table shall only be applied to tapered insulation that is tapered along only one axis. i In areas of differing insulation slopes/configurations, individual U-values shall be calculated and an area weighted U-value calculation shall be used to determine the effective value of the roof.