ANSI/ASHRAE/IESNA Standard 90.1-2007 81 TABLE A3.1A Assembly U-Factors for Above-Grade Concrete Walls and Masonry Walls Framing Type and Depth Rated R-Value of Insulation Alone Assembly U-Factors for 8 in. Normal Weight 145 lb/ft3 Solid Concrete Walls Assembly U-Factors for 8 in. Medium Weight 115 lb/ft3 Concrete Block Walls: Solid Grouted Assembly U-Factors for 8 in. Medium Weight 115 lb/ft3 Concrete Block Walls: Partially Grouted (Cores Uninsulated Except Where Specified) No Framing R-0 U-0.740 U-0.580 U-0.480 Ungrouted Cores Filled with Loose-Fill Insulation N/A N/A U-0.350 Continuous Metal Framing at 24 in. on Center Horizontally 3.5 in. R-11.0 U-0.168 U-0.158 U-0.149 3.5 in. R-13.0 U-0.161 U-0.152 U-0.144 3.5 in. R-15.0 U-0.155 U-0.147 U-0.140 4.5 in. R-17.1 U-0.133 U-0.126 U-0.121 4.5 in. R-22.5 U-0.124 U-0.119 U-0.114 4.5 in. R-25.2 U-0.122 U-0.116 U-0.112 5.0 in. R-19.0 U-0.122 U-0.117 U-0.112 5.0 in. R-25.0 U-0.115 U-0.110 U-0.106 5.0 in. R-28.0 U-0.112 U-0.107 U-0.103 5.5 in. R-19.0 U-0.118 U-0.113 U-0.109 5.5 in. R-20.9 U-0.114 U-0.109 U-0.105 5.5 in. R-21.0 U-0.113 U-0.109 U-0.105 5.5 in. R-27.5 U-0.106 U-0.102 U-0.099 5.5 in. R-30.8 U-0.104 U-0.100 U-0.096 6.0 in. R-22.8 U-0.106 U-0.102 U-0.098 6.0 in. R-30.0 U-0.099 U-0.095 U-0.092 6.0 in. R-33.6 U-0.096 U-0.093 U-0.090 6.5 in. R-24.7 U-0.099 U-0.096 U-0.092 7.0 in. R-26.6 U-0.093 U-0.090 U-0.087 7.5 in. R-28.5 U-0.088 U-0.085 U-0.083 8.0 in. R-30.4 U-0.083 U-0.081 U-0.079 1 in. Metal Clips at 24 in. on Center Horizontally and 16 in. Vertically 1.0 in. R-3.8 U-0.210 U-0.195 U-0.182 1.0 in. R-5.0 U-0.184 U-0.172 U-0.162 1.0 in. R-5.6 U-0.174 U-0.163 U-0.154 1.5 in. R-5.7 U-0.160 U-0.151 U-0.143 1.5 in. R-7.5 U-0.138 U-0.131 U-0.125 1.5 in. R-8.4 U-0.129 U-0.123 U-0.118 2.0 in. R-7.6 U-0.129 U-0.123 U-0.118 2.0 in. R-10.0 U-0.110 U-0.106 U-0.102 2.0 in. R-11.2 U-0.103 U-0.099 U-0.096 2.5 in. R-9.5 U-0.109 U-0.104 U-0.101 2.5 in. R-12.5 U-0.092 U-0.089 U-0.086 2.5 in. R-14.0 U-0.086 U-0.083 U-0.080 3.0 in. R-11.4 U-0.094 U-0.090 U-0.088 3.0 in. R-15.0 U-0.078 U-0.076 U-0.074 3.0 in. R-16.8 U-0.073 U-0.071 U-0.069 3.5 in. R-13.3 U-0.082 U-0.080 U-0.077 3.5 in. R-17.5 U-0.069 U-0.067 U-0.065 3.5 in. R-19.6 U-0.064 U-0.062 U-0.061 4.0 in. R-15.2 U-0.073 U-0.071 U-0.070 4.0 in. R-20.0 U-0.061 U-0.060 U-0.058