(This is a normative appendix and is part of this standard.)
- the interior structure, hereafter referred to as the base assembly, for the class of construction is the same as described in Sections A2 through A8 and
- changes in exterior or interior surface building materials added to the base assembly do not increase or decrease the R-value by more than 2 from that indicated in the descriptions in Sections A2 through A8.
Insulation, including insulated sheathing, is not considered a building material.
Exception: Interruptions for framing and pads for mechanical equipment are permitted with a combined total area not exceeding one percent of the total opaque assembly area.
TABLE A2.2.3 Assembly U-Factors for Roofs with Insulation Entirely Above Deck
Rated R-Value of Insulation Alone | Overall U-Factor for Entire Assembly |
---|---|
R-0 | U-1.282 |
R-1 | U-0.562 |
R-2 | U-0.360 |
R-3 | U-0.265 |
R-4 | U-0.209 |
R-5 | U-0.173 |
R-6 | U-0.147 |
R-7 | U-0.129 |
R-8 | U-0.114 |
R-9 | U-0.102 |
R-10 | U-0.093 |
R-11 | U-0.085 |
R-12 | U-0.078 |
R-13 | U-0.073 |
R-14 | U-0.068 |
R-15 | U-0.063 |
R-16 | U-0.060 |
R-17 | U-0.056 |
R-18 | U-0.053 |
R-19 | U-0.051 |
R-20 | U-0.048 |
R-21 | U-0.046 |
R-22 | U-0.044 |
R-23 | U-0.042 |
R-24 | U-0.040 |
R-25 | U-0.039 |
R-26 | U-0.037 |
R-27 | U-0.036 |
R-28 | U-0.035 |
R-29 | U-0.034 |
R-30 | U-0.032 |
R-35 | U-0.028 |
R-40 | U-0.025 |
R-45 | U-0.022 |
R-50 | U-0.020 |
R-55 | U-0.018 |
R-60 | U-0.016 |
TABLE A2.3.3 Assembly U-Factors for Metal Building Roofs
Insulation System | Rated R-Value of Insulation | Overall U-Factor for Entire Base Roof Assembly | Overall U-Factor for Assembly of Base Roof Plus Continuous Insulation (Uninterrupted by Framing) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Rated R-Value of Continuous Insulation | |||||||||||
R-6.5 | R-9.8 | R-13 | R-15.8 | R-19 | R-22.1 | R-25 | R-32 | R-38 | |||
Standing Seam Roofs with Thermal Spacer Blocks^{a, b} | |||||||||||
Single Layer | None | 1.280 | 0.137 | 0.095 | 0.073 | 0.060 | 0.051 | 0.044 | 0.039 | 0.031 | 0.026 |
R-10 | 0.115 | 0.066 | 0.054 | 0.046 | 0.041 | 0.036 | 0.032 | 0.030 | 0.025 | 0.021 | |
R-11 | 0.107 | 0.063 | 0.052 | 0.045 | 0.040 | 0.035 | 0.032 | 0.029 | 0.024 | 0.021 | |
R-13 | 0.101 | 0.061 | 0.051 | 0.044 | 0.039 | 0.035 | 0.031 | 0.029 | 0.024 | 0.021 | |
R-16 | 0.096 | 0.059 | 0.049 | 0.043 | 0.038 | 0.034 | 0.031 | 0.028 | 0.024 | 0.021 | |
R-19 | 0.082 | 0.053 | 0.045 | 0.040 | 0.036 | 0.032 | 0.029 | 0.027 | 0.023 | 0.020 | |
Double Layer | R-10 + R-10 | 0.088 | 0.056 | 0.047 | 0.041 | 0.037 | 0.033 | 0.030 | 0.028 | 0.023 | 0.020 |
R-10 + R-11 | 0.086 | 0.055 | 0.047 | 0.041 | 0.036 | 0.033 | 0.030 | 0.027 | 0.023 | 0.020 | |
R-11 + R-11 | 0.085 | 0.055 | 0.046 | 0.040 | 0.036 | 0.033 | 0.030 | 0.027 | 0.023 | 0.020 | |
R-10 + R-13 | 0.084 | 0.054 | 0.046 | 0.040 | 0.036 | 0.032 | 0.029 | 0.027 | 0.023 | 0.020 | |
R-11 + R-13 | 0.082 | 0.053 | 0.045 | 0.040 | 0.036 | 0.032 | 0.029 | 0.027 | 0.023 | 0.020 | |
R-13 + R-13 | 0.075 | 0.050 | 0.043 | 0.038 | 0.034 | 0.031 | 0.028 | 0.026 | 0.022 | 0.019 | |
R-10 + R-19 | 0.074 | 0.050 | 0.043 | 0.038 | 0.034 | 0.031 | 0.028 | 0.026 | 0.022 | 0.019 | |
R-11 + R-19 | 0.072 | 0.049 | 0.042 | 0.037 | 0.034 | 0.030 | 0.028 | 0.026 | 0.022 | 0.019 | |
R-13 + R-19 | 0.068 | 0.047 | 0.041 | 0.036 | 0.033 | 0.030 | 0.027 | 0.025 | 0.021 | 0.019 | |
R-16 + R-19 | 0.065 | 0.046 | 0.040 | 0.035 | 0.032 | 0.029 | 0.027 | 0.025 | 0.021 | 0.019 | |
R-19 + R-19 | 0.060 | 0.043 | 0.038 | 0.034 | 0.031 | 0.028 | 0.026 | 0.024 | 0.021 | 0.018 | |
Liner System | R-19 + R-11 | 0.037 | |||||||||
R-25 + R-8 | 0.037 | ||||||||||
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 | 0.041 | 0.032 | 0.029 | 0.027 | 0.025 | 0.023 | 0.022 | 0.020 | 0.018 | 0.016 | |
Standing Seam Roofs without Thermal Spacer Blocks | |||||||||||
Liner System | R-19+R-11 | 0.040 | |||||||||
Through-Fastened Roofs without Thermal Spacer Blocks | |||||||||||
R-10 | 0.184 | 0.084 | 0.066 | 0.054 | 0.047 | 0.041 | 0.036 | 0.033 | 0.027 | 0.023 | |
R-11 | 0.182 | 0.083 | 0.065 | 0.054 | 0.047 | 0.041 | 0.036 | 0.033 | 0.027 | 0.023 | |
R-13 | 0.174 | 0.082 | 0.064 | 0.053 | 0.046 | 0.040 | 0.036 | 0.033 | 0.026 | 0.023 | |
R-16 | 0.157 | 0.078 | 0.062 | 0.052 | 0.045 | 0.039 | 0.035 | 0.032 | 0.026 | 0.023 | |
R-19 | 0.151 | 0.076 | 0.061 | 0.051 | 0.045 | 0.039 | 0.035 | 0.032 | 0.026 | 0.022 | |
Liner System | R-19+R-11 | 0.044 | |||||||||
(Multiple R-values are listed in order from inside to outside) |
- Attic roof, standard framing: insulation is tapered around the perimeter with a resultant decrease in thermal resistance. Weighting factors are 85% full-depth insulation, 5% half-depth insulation, and 10% joists.
- Attic roof, advanced framing: full and even depth of insulation extending to the outside edge of exterior walls. Weighting factors are 90% full-depth insulation and 10% joists.
- Single-rafter roof: an attic roof where the roof sheathing and ceiling are attached to the same rafter. Weighting factors are 90% full-depth insulation and 10% joists.
TABLE A2.4.2 Single-Rafter Roofs
Climate Zone | Minimum Insulation R-Value or Maximum Assembly U-Factor | ||
---|---|---|---|
Wood Rafter Depth, d (Actual) | |||
d ≤ 8 in. | 8 < d ≤ 10 in. | 10 < d ≤ 12 in. | |
1—7 | R-19/U-0.055 | R-30/U-0.036 | R-38/U-0.028 |
8 | R-21/U-0.052 | R-30/U-0.036 | R-38/U-0.028 |
TABLE A2.4.3 Assembly U-Factors for Attic Roofs with Wood Joists
Rated R-Value of Insulation Alone | Overall U-Factor for Entire Assembly | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Wood-Framed Attic, Standard Framing | |||||||||||
None | U-0.613 | ||||||||||
R-11 | U-0.091 | ||||||||||
R-13 | U-0.081 | ||||||||||
R-19 | U-0.053 | ||||||||||
R-30 | U-0.034 | ||||||||||
R-38 | U-0.027 | ||||||||||
R-49 | U-0.021 | ||||||||||
R-60 | U-0.017 | ||||||||||
R-71 | U-0.015 | ||||||||||
R-82 | U-0.013 | ||||||||||
R-93 | U-0.011 | ||||||||||
R-104 | U-0.010 | ||||||||||
R-115 | U-0.009 | ||||||||||
R-126 | U-0.008 | ||||||||||
Wood-Framed Attic, Advanced Framing | |||||||||||
None | U-0.613 | ||||||||||
R-11 | U-0.088 | ||||||||||
R-13 | U-0.078 | ||||||||||
R-19 | U-0.051 | ||||||||||
R-30 | U-0.032 | ||||||||||
R-38 | U-0.026 | ||||||||||
R-49 | U-0.020 | ||||||||||
R-60 | U-0.016 | ||||||||||
R-71 | U-0.014 | ||||||||||
R-82 | U-0.012 | ||||||||||
R-93 | U-0.011 | ||||||||||
R-104 | U-0.010 | ||||||||||
R-115 | U-0.009 | ||||||||||
R-126 | U-0.008 | ||||||||||
Wood Joists, Single-rafter Roof | |||||||||||
Overall U-Factor for Assembly of Base Roof Plus Continuous Insulation (Uninterrupted by Framing) | |||||||||||
Cavity Insulation R-Value | Rated R-Value of Continuous Insulation | ||||||||||
None | R-5 | R-10 | R-15 | ||||||||
None | U-0.417 | U-0.135 | U-0.081 | U-0.057 | |||||||
R-11 | U-0.088 | U-0.061 | U-0.047 | U-0.038 | |||||||
R-13 | U-0.078 | U-0.056 | U-0.044 | U-0.036 | |||||||
R-15 | U-0.071 | U-0.052 | U-0.041 | U-0.034 | |||||||
R-19 | U-0.055 | U-0.043 | U-0.035 | U-0.030 | |||||||
R-21 | U-0.052 | U-0.041 | U-0.034 | U-0.029 | |||||||
R-25 | U-0.042 | U-0.035 | U-0.030 | U-0.026 | |||||||
R-30 | U-0.036 | U-0.030 | U-0.026 | U-0.023 | |||||||
R-38 | U-0.029 | U-0.025 | U-0.022 | U-0.020 |
TABLE A2.5.2 Assembly U-Factors for Attic Roofs with Steel Joists (4.0 ft on Center)
Rated R-Value of Insulation Alone | Overall U-Factor for Entire Assembly |
---|---|
R-0 | U-1.282 |
R-4 | U-0.215 |
R-5 | U-0.179 |
R-8 | U-0.120 |
R-10 | U-0.100 |
R-11 | U-0.093 |
R-12 | U-0.086 |
R-13 | U-0.080 |
R-15 | U-0.072 |
R-16 | U-0.068 |
R-19 | U-0.058 |
R-20 | U-0.056 |
R-21 | U-0.054 |
R-24 | U-0.049 |
R-25 | U-0.048 |
R-30 | U-0.041 |
R-35 | U-0.037 |
R-38 | U-0.035 |
R-40 | U-0.033 |
R-45 | U-0.031 |
R-50 | U-0.028 |
R-55 | U-0.027 |
TABLE A3.1-1 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/ft^{3} Solid Concrete Walls | Assembly U-Factors for 8 in. Medium Weight 115 lb/ft^{3} Concrete Block Walls: Solid Grouted | Assembly U-Factors for 8 in. Medium Weight 115 lb/ft^{3} Concrete Block Walls: Partially Grouted (Cores Uninsulated Except here specified) |
---|---|---|---|---|
No Framing | R-0 | U-0.740 | U-0.580 | U-0.480 |
Ungrouted Cores Filled with Loose-Fill Insulation | NA | NA | U-0.350 | |
Continuous Metal Framing at 24 in. on Center Horizontally | ||||
1.0 in. | R-0 | U-0.414 | U-0.359 | U-0.318 |
1.0 in. | R-3.8 | U-0.325 | U-0.290 | U-0.263 |
1.0 in. | R-5 | U-0.314 | U-0.281 | U-0.255 |
1.0 in. | R-6.5 | U-0.305 | U-0.274 | U-0.249 |
1.5 in. | R-11 | U-0.267 | U-0.243 | U-0.223 |
2.0 in. | R-7.6 | U-0.230 | U-0.212 | U-0.197 |
2.0 in. | R-10 | U-0.219 | U-0.202 | U-0.188 |
2.0 in. | R-13 | U-0.210 | U-0.195 | U-0.182 |
3.0 in. | R-11.4 | U-0.178 | U-0.167 | U-0.157 |
3.0 in. | R-15 | U-0.168 | U-0.158 | U-0.149 |
3.0 in. | R-19.0 | U-0.161 | U-0.152 | U-0.144 |
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 |
5.0 in. | R-32.0 | U-0.109 | U-0.105 | U-0.101 |
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 |
4.0 in. | R-22.4 | U-0.057 | U-0.056 | U-0.054 |
5.0 in. | R-28.0 | U-0.046 | U-0.046 | U-0.045 |
6.0 in. | R-33.6 | U-0.039 | U-0.039 | U-0.038 |
7.0 in. | R-39.2 | U-0.034 | U-0.034 | U-0.033 |
8.0 in. | R-44.8 | U-0.030 | U-0.030 | U-0.029 |
9.0 in. | R-50.4 | U-0.027 | U-0.027 | U-0.026 |
10.0 in. | R-56.0 | U-0.024 | U-0.024 | U-0.024 |
11.0 in. | R-61.6 | U-0.022 | U-0.022 | U-0.022 |
Continuous Insulation Uninterrupted by Framing | ||||
No Framing | R-1.0 | U-0.425 | U-0.367 | U-0.324 |
No Framing | R-2.0 | U-0.298 | U-0.269 | U-0.245 |
No Framing | R-3.0 | U-0.230 | U-0.212 | U-0.197 |
No Framing | R-4.0 | U-0.187 | U-0.175 | U-0.164 |
No Framing | R-5.0 | U-0.157 | U-0.149 | U-0.141 |
No Framing | R-6.0 | U-0.136 | U-0.129 | U-0.124 |
No Framing | R-7.0 | U-0.120 | U-0.115 | U-0.110 |
No Framing | R-8.0 | U-0.107 | U-0.103 | U-0.099 |
No Framing | R-9.0 | U-0.097 | U-0.093 | U-0.090 |
No Framing | R-10.0 | U-0.088 | U-0.085 | U-0.083 |
No Framing | R-11.0 | U-0.081 | U-0.079 | U-0.076 |
No Framing | R-12.0 | U-0.075 | U-0.073 | U-0.071 |
No Framing | R-13.0 | U-0.070 | U-0.068 | U-0.066 |
No Framing | R-14.0 | U-0.065 | U-0.064 | U-0.062 |
No Framing | R-15.0 | U-0.061 | U-0.060 | U-0.059 |
No Framing | R-16.0 | U-0.058 | U-0.056 | U-0.055 |
No Framing | R-17.0 | U-0.054 | U-0.053 | U-0.052 |
No Framing | R-18.0 | U-0.052 | U-0.051 | U-0.050 |
No Framing | R-19.0 | U-0.049 | U-0.048 | U-0.047 |
No Framing | R-20.0 | U-0.047 | U-0.046 | U-0.045 |
No Framing | R-21.0 | U-0.045 | U-0.044 | U-0.043 |
No Framing | R-22.0 | U-0.043 | U-0.042 | U-0.042 |
No Framing | R-23.0 | U-0.041 | U-0.040 | U-0.040 |
No Framing | R-24.0 | U-0.039 | U-0.039 | U-0.038 |
No Framing | R-25.0 | U-0.038 | U-0.037 | U-0.037 |
No Framing | R-30.0 | U-0.032 | U-0.032 | U-0.031 |
No Framing | R-35.0 | U-0.028 | U-0.027 | U-0.027 |
No Framing | R-40.0 | U-0.024 | U-0.024 | U-0.024 |
No Framing | R-45.0 | U-0.022 | U-0.021 | U-0.021 |
No Framing | R-50.0 | U-0.019 | U-0.019 | U-0.019 |
No Framing | R-55.0 | U-0.018 | U-0.018 | U-0.018 |
No Framing | R-60.0 | U-0.016 | U-0.016 | U-0.016 |
Brick Cavity Wall with Continuous Insulation | ||||
No Framing | R-0 | U-0.337 | U-0.299 | U-0.270 |
No Framing | R-3.8 | U-0.148 | U-0.140 | U-0.133 |
No Framing | R-5.0 | U-0.125 | U-0.120 | U-0.115 |
No Framing | R-6.5 | U-0.106 | U-0.102 | U-0.098 |
No Framing | R-7.6 | U-0.095 | U-0.091 | U-0.088 |
No Framing | R-10 | U-0.077 | U-0.075 | U-0.073 |
No Framing | R-10.5 | U-0.079 | U-0.077 | U-0.075 |
No Framing | R-11.4 | U-0.070 | U-0.068 | U-0.066 |
No Framing | R-15 | U-0.056 | U-0.055 | U-0.053 |
No Framing | R-16.5 | U-0.054 | U-0.053 | U-0.052 |
No Framing | R-19.0 | U-0.046 | U-0.045 | U-0.044 |
No Framing | R-22.5 | U-0.041 | U-0.040 | U-0.039 |
No Framing | R-28.5 | U-0.033 | U-0.032 | U-0.032 |
Continuous Insulation Uninterrupted by Framing with Stucco and Continuous Metal Framing at 24 in. on Center Horizontally | ||||
1.0 in. | R-0+R-19.0 c.i. | U-0.047 | U-0.046 | U-0.045 |
1.0 in. | R-3.8+R-19.0 c.i. | U-0.045 | U-0.044 | U-0.044 |
1.0 in. | R-5+R-19.0 c.i. | U-0.045 | U-0.044 | U-0.043 |
1.0 in. | R-6.5+R-19.0 c.i. | U-0.045 | U-0.044 | U-0.043 |
1.5 in. | R-11+R-19.0 c.i. | U-0.044 | U-0.043 | U-0.043 |
2.0 in. | R-7.6+R-19.0 c.i. | U-0.043 | U-0.042 | U-0.041 |
2.0 in. | R-10+R-19.0 c.i. | U-0.042 | U-0.041 | U-0.041 |
2.0 in. | R-13+R-19.0 c.i. | U-0.042 | U-0.041 | U-0.041 |
3.0 in. | R-11.4+R-19.0 c.i. | U-0.041 | U-0.040 | U-0.039 |
3.0 in. | R-15+R-19.0 c.i. | U-0.040 | U-0.039 | U-0.039 |
3.0 in. | R-19.5+R-19.0 c.i. | U-0.040 | U-0.039 | U-0.038 |
3.5 in. | R-11.0+R-19.0 c.i. | U-0.040 | U-0.039 | U-0.039 |
3.5 in. | R-13.0+R-19.0 c.i. | U-0.040 | U-0.039 | U-0.038 |
5.0 in. | R-19.0+R-19.0 c.i. | U-0.037 | U-0.036 | U-0.036 |
5.0 in. | R-25+R-19.0 c.i. | U-0.036 | U-0.035 | U-0.035 |
5.0 in. | R-32.5+R-19.0 c.i. | U-0.035 | U-0.035 | U-0.034 |
5.5 in. | R-19.0+R-19.0 c.i. | U-0.036 | U-0.036 | U-0.035 |
5.5 in. | R-21.0+R-19.0 c.i. | U-0.035 | U-0.035 | U-0.035 |
TABLE A3.1-2 Assembly U-Factors, C-Factors, R_{u}, R_{c}, and HC for Concrete
Density, lb/ft^{3} | Properties | Thickness, in. | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | ||
20 | U-factor | 0.22 | 0.17 | 0.14 | 0.12 | 0.10 | 0.09 | 0.08 | 0.07 | 0.07 | 0.06 |
C-factor | 0.27 | 0.20 | 0.16 | 0.13 | 0.11 | 0.10 | 0.09 | 0.08 | 0.07 | 0.07 | |
R_{u} | 4.60 | 5.85 | 7.10 | 8.35 | 9.60 | 10.85 | 12.10 | 13.35 | 14.60 | 15.85 | |
R_{c} | 3.75 | 5.00 | 6.25 | 7.50 | 8.75 | 10.00 | 11.25 | 12.50 | 13.75 | 15.00 | |
HC | 1.0 | 1.3 | 1.7 | 2.0 | 2.3 | 2.7 | 3.0 | 3.3 | 3.7 | 4.0 | |
30 | U-factor | 0.28 | 0.22 | 0.19 | 0.16 | 0.14 | 0.12 | 0.11 | 0.10 | 0.09 | 0.09 |
C-factor | 0.37 | 0.28 | 0.22 | 0.18 | 0.16 | 0.14 | 0.12 | 0.11 | 0.10 | 0.09 | |
R_{u} | 3.58 | 4.49 | 5.40 | 6.30 | 7.21 | 8.12 | 9.03 | 9.94 | 10.85 | 11.76 | |
R_{c} | 2.73 | 3.64 | 4.55 | 5.45 | 6.36 | 7.27 | 8.18 | 9.09 | 10.00 | 10.91 | |
HC | 1.5 | 2.0 | 2.5 | 3.0 | 3.5 | 4.0 | 4.5 | 5.0 | 5.5 | 6.0 | |
40 | U-factor | 0.33 | 0.27 | 0.23 | 0.19 | 0.17 | 0.15 | 0.14 | 0.13 | 0.11 | 0.11 |
C-factor | 0.47 | 0.35 | 0.28 | 0.23 | 0.20 | 0.18 | 0.16 | 0.14 | 0.13 | 0.12 | |
R_{u} | 2.99 | 3.71 | 4.42 | 5.14 | 5.85 | 6.56 | 7.28 | 7.99 | 8.71 | 9.42 | |
R_{c} | 2.14 | 2.86 | 3.57 | 4.29 | 5.00 | 5.71 | 6.43 | 7.14 | 7.86 | 8.57 | |
HC | 2.0 | 2.7 | 3.3 | 4.0 | 4.7 | 5.3 | 6.0 | 6.7 | 7.3 | 8.0 | |
50 | U-factor | 0.38 | 0.31 | 0.26 | 0.23 | 0.20 | 0.18 | 0.16 | 0.15 | 0.14 | 0.13 |
C-factor | 0.57 | 0.43 | 0.34 | 0.28 | 0.24 | 0.21 | 0.19 | 0.17 | 0.15 | 0.14 | |
R_{u} | 2.61 | 3.20 | 3.79 | 4.38 | 4.97 | 5.56 | 6.14 | 6.73 | 7.32 | 7.91 | |
R_{c} | 1.76 | 2.35 | 2.94 | 3.53 | 4.12 | 4.71 | 5.29 | 5.88 | 6.47 | 7.06 | |
HC | 2.5 | 3.3 | 4.2 | 5.0 | 5.8 | 6.7 | 7.5 | 8.3 | 9.2 | 10.0 | |
85 | U-factor | 0.65 | 0.56 | 0.50 | 0.44 | 0.40 | 0.37 | 0.34 | 0.31 | 0.29 | 0.27 |
C-factor | 1.43 | 1.08 | 0.86 | 0.71 | 0.61 | 0.54 | 0.48 | 0.43 | 0.39 | 0.36 | |
R_{u} | 1.55 | 1.78 | 2.01 | 2.25 | 2.48 | 2.71 | 2.94 | 3.18 | 3.41 | 3.64 | |
R_{c} | 0.70 | 0.93 | 1.16 | 1.40 | 1.63 | 1.86 | 2.09 | 2.33 | 2.56 | 2.79 | |
HC | 4.3 | 5.7 | 7.1 | 8.5 | 9.9 | 11.3 | 12.8 | 14.2 | 15.6 | 17.0 | |
95 | U-factor | 0.72 | 0.64 | 0.57 | 0.52 | 0.48 | 0.44 | 0.41 | 0.38 | 0.36 | 0.33 |
C-factor | 1.85 | 1.41 | 1.12 | 0.93 | 0.80 | 0.70 | 0.62 | 0.56 | 0.51 | 0.47 | |
R_{u} | 1.39 | 1.56 | 1.74 | 1.92 | 2.10 | 2.28 | 2.46 | 2.64 | 2.81 | 2.99 | |
R_{c} | 0.54 | 0.71 | 0.89 | 1.07 | 1.25 | 1.43 | 1.61 | 1.79 | 1.96 | 2.14 | |
HC | 4.8 | 6.3 | 7.9 | 9.5 | 11.1 | 12.7 | 14.3 | 15.8 | 17.4 | 19.0 | |
105 | U-factor | 0.79 | 0.71 | 0.65 | 0.59 | 0.54 | 0.51 | 0.47 | 0.44 | 0.42 | 0.39 |
C-factor | 2.38 | 1.79 | 1.43 | 1.18 | 1.01 | 0.88 | 0.79 | 0.71 | 0.65 | 0.59 | |
R_{u} | 1.27 | 1.41 | 1.56 | 1.70 | 1.84 | 1.98 | 2.12 | 2.26 | 2.40 | 2.54 | |
R_{c} | 0.42 | 0.56 | 0.70 | 0.85 | 0.99 | 1.13 | 1.27 | 1.41 | 1.55 | 1.69 | |
HC | 5.3 | 7.0 | 8.8 | 10.5 | 12.3 | 14.0 | 15.8 | 17.5 | 19.3 | 21.0 | |
115 | U-factor | 0.84 | 0.77 | 0.70 | 0.65 | 0.61 | 0.57 | 0.53 | 0.50 | 0.48 | 0.45 |
C-factor | 2.94 | 2.22 | 1.75 | 1.47 | 1.25 | 1.10 | 0.98 | 0.88 | 0.80 | 0.74 | |
R_{u} | 1.19 | 1.30 | 1.42 | 1.53 | 1.65 | 1.76 | 1.87 | 1.99 | 2.10 | 2.21 | |
R_{c} | 0.34 | 0.45 | 0.57 | 0.68 | 0.80 | 0.91 | 1.02 | 1.14 | 1.25 | 1.36 | |
HC | 5.8 | 7.7 | 9.6 | 11.5 | 13.4 | 15.3 | 17.3 | 19.2 | 21.1 | 23.0 | |
125 | U-factor | 0.88 | 0.82 | 0.76 | 0.71 | 0.67 | 0.63 | 0.60 | 0.56 | 0.53 | 0.51 |
C-factor | 3.57 | 2.70 | 2.17 | 1.79 | 1.54 | 1.35 | 1.20 | 1.03 | 0.98 | 0.90 | |
R_{u} | 1.13 | 1.22 | 1.31 | 1.41 | 1.50 | 1.59 | 1.68 | 1.78 | 1.87 | 1.96 | |
R_{c} | 0.28 | 0.37 | 0.46 | 0.56 | 0.65 | 0.74 | 0.83 | 0.93 | 1.02 | 1.11 | |
HC | 6.3 | 8.3 | 10.4 | 12.5 | 14.6 | 16.7 | 18.8 | 20.8 | 22.9 | 25.0 | |
135 | U-factor | 0.93 | 0.87 | 0.82 | 0.77 | 0.73 | 0.69 | 0.66 | 0.63 | 0.60 | 0.57 |
C-factor | 4.55 | 3.33 | 2.70 | 2.22 | 1.92 | 1.67 | 1.49 | 1.33 | 1.22 | 1.11 | |
R_{u} | 1.07 | 1.15 | 1.22 | 1.30 | 1.37 | 1.45 | 1.52 | 1.60 | 1.67 | 1.75 | |
R_{c} | 0.22 | 0.30 | 0.37 | 0.45 | 0.52 | 0.60 | 0.67 | 0.75 | 0.82 | 0.90 | |
HC | 6.8 | 9.0 | 11.3 | 13.5 | 15.8 | 18.0 | 20.3 | 22.5 | 24.8 | 27.0 | |
144 | U-factor | 0.96 | 0.91 | 0.86 | 0.81 | 0.78 | 0.74 | 0.71 | 0.68 | 0.65 | 0.63 |
C-factor | 5.26 | 4.00 | 3.23 | 2.63 | 2.27 | 2.00 | 1.79 | 1.59 | 1.45 | 1.33 | |
R_{u} | 1.04 | 1.10 | 1.16 | 1.23 | 1.29 | 1.35 | 1.41 | 1.48 | 1.54 | 1.60 | |
R_{c} | 0.19 | 0.25 | 0.31 | 0.38 | 0.44 | 0.50 | 0.56 | 0.63 | 0.69 | 0.75 | |
HC | 7.2 | 9.6 | 12.0 | 14.4 | 16.8 | 19.2 | 21.6 | 24.0 | 26.4 | 28.8 |
The U-factors and R_{u} include standard air film resistances.
The C-factors and R_{c} are for the same assembly without air film resistances.
Note that the following assemblies do not qualify as a mass wall or mass floor: 3 in. thick concrete with densities of 85, 95, 125, and 135 lb/ft^{3}.
TABLE A3.1-3 Assembly U-Factors, C-Factors, R_{u}, R_{c}, and HC for Concrete Block Walls
Product Size, in. | Density, lb/ft^{3} | Properties | Concrete Block Grouting and Cell Treatment | ||||
---|---|---|---|---|---|---|---|
Solid Grouted | Partly Grouted, Cells Empty | Partly Grouted, Cells Insulated | Unreinforced, Cells Empty | Unreinforced, Cells Insulated | |||
6 in. Block | 85 | U-factor | 0.57 | 0.46 | 0.34 | 0.40 | 0.20 |
C-factor | 1.11 | 0.75 | 0.47 | 0.60 | 0.23 | ||
R_{u} | 1.75 | 2.18 | 2.97 | 2.52 | 5.13 | ||
R_{c} | 0.90 | 1.33 | 2.12 | 1.67 | 4.28 | ||
HC | 10.9 | 6.7 | 7.0 | 4.2 | 4.6 | ||
95 | U-factor | 0.61 | 0.49 | 0.36 | 0.42 | 0.22 | |
C-factor | 1.25 | 0.83 | 0.53 | 0.65 | 0.27 | ||
R_{u} | 1.65 | 2.06 | 2.75 | 2.38 | 4.61 | ||
R_{c} | 0.80 | 1.21 | 1.90 | 1.53 | 3.76 | ||
HC | 11.4 | 7.2 | 7.5 | 4.7 | 5.1 | ||
105 | U-factor | 0.64 | 0.51 | 0.39 | 0.44 | 0.24 | |
C-factor | 1.38 | 0.91 | 0.58 | 0.71 | 0.30 | ||
R_{u} | 1.57 | 1.95 | 2.56 | 2.26 | 4.17 | ||
R_{c} | 0.72 | 1.10 | 1.71 | 1.41 | 3.32 | ||
HC | 11.9 | 7.7 | 7.9 | 5.1 | 5.6 | ||
115 | U-factor | 0.66 | 0.54 | 0.41 | 0.46 | 0.26 | |
C-factor | 1.52 | 0.98 | 0.64 | 0.76 | 0.34 | ||
R_{u} | 1.51 | 1.87 | 2.41 | 2.16 | 3.79 | ||
R_{c} | 0.66 | 1.02 | 1.56 | 1.31 | 2.94 | ||
HC | 12.3 | 8.1 | 8.4 | 5.6 | 6.0 | ||
125 | U-factor | 0.70 | 0.56 | 0.45 | 0.49 | 0.30 | |
C-factor | 1.70 | 1.08 | 0.73 | 0.84 | 0.40 | ||
R_{u} | 1.44 | 1.78 | 2.23 | 2.04 | 3.38 | ||
R_{c} | 0.59 | 0.93 | 1.38 | 1.19 | 2.53 | ||
HC | 12.8 | 8.6 | 8.8 | 6.0 | 6.5 | ||
135 | U-factor | 0.73 | 0.60 | 0.49 | 0.53 | 0.35 | |
C-factor | 1.94 | 1.23 | 0.85 | 0.95 | 0.49 | ||
R_{u} | 1.36 | 1.67 | 2.02 | 1.90 | 2.89 | ||
R_{c} | 0.51 | 0.82 | 1.17 | 1.05 | 2.04 | ||
HC | 13.2 | 9.0 | 9.3 | 6.5 | 6.9 | ||
8 in. Block | 85 | U-factor | 0.49 | 0.41 | 0.28 | 0.37 | 0.15 |
C-factor | 0.85 | 0.63 | 0.37 | 0.53 | 0.17 | ||
R_{u} | 2.03 | 2.43 | 3.55 | 2.72 | 6.62 | ||
R_{c} | 1.18 | 1.58 | 2.70 | 1.87 | 5.77 | ||
HC | 15.0 | 9.0 | 9.4 | 5.4 | 6.0 | ||
95 | U-factor | 0.53 | 0.44 | 0.31 | 0.39 | 0.17 | |
C-factor | 0.95 | 0.70 | 0.41 | 0.58 | 0.20 | ||
R_{u} | 1.90 | 2.29 | 3.27 | 2.57 | 5.92 | ||
R_{c} | 1.05 | 1.44 | 2.42 | 1.72 | 5.07 | ||
HC | 15.5 | 9.6 | 10.0 | 6.0 | 6.6 | ||
105 | U-factor | 0.55 | 0.46 | 0.33 | 0.41 | 0.19 | |
C-factor | 1.05 | 0.76 | 0.46 | 0.63 | 0.22 | ||
R_{u} | 1.81 | 2.17 | 3.04 | 2.44 | 5.32 | ||
R_{c} | 0.96 | 1.32 | 2.19 | 1.59 | 4.47 | ||
HC | 16.1 | 10.2 | 10.6 | 6.6 | 7.2 | ||
115 | U-factor | 0.58 | 0.48 | 0.35 | 0.43 | 0.21 | |
C-factor | 1.14 | 0.82 | 0.50 | 0.68 | 0.25 | ||
R_{u} | 1.72 | 2.07 | 2.84 | 2.33 | 4.78 | ||
R_{c} | 0.87 | 1.22 | 1.99 | 1.48 | 3.93 | ||
HC | 16.7 | 10.8 | 11.2 | 7.2 | 7.8 | ||
125 | U-factor | 0.61 | 0.51 | 0.38 | 0.45 | 0.24 | |
C-factor | 1.27 | 0.90 | 0.57 | 0.74 | 0.30 | ||
R_{u} | 1.64 | 1.96 | 2.62 | 2.20 | 4.20 | ||
R_{c} | 0.79 | 1.11 | 1.77 | 1.35 | 3.35 | ||
HC | 17.3 | 11.4 | 11.8 | 7.8 | 8.4 | ||
135 | U-factor | 0.65 | 0.55 | 0.42 | 0.49 | 0.28 | |
C-factor | 1.44 | 1.02 | 0.67 | 0.83 | 0.37 | ||
R_{u} | 1.54 | 1.83 | 2.35 | 2.05 | 3.55 | ||
R_{c} | 0.69 | 0.98 | 1.50 | 1.20 | 2.70 | ||
HC | 17.9 | 12.0 | 12.4 | 8.4 | 9.0 | ||
10 in. Block | 85 | U-factor | 0.44 | 0.38 | 0.25 | 0.35 | 0.13 |
C-factor | 0.70 | 0.57 | 0.31 | 0.50 | 0.14 | ||
R_{u} | 2.29 | 2.61 | 4.05 | 2.84 | 7.87 | ||
R_{c} | 1.44 | 1.76 | 3.20 | 1.99 | 7.02 | ||
HC | 19.0 | 11.2 | 11.7 | 6.5 | 7.3 | ||
95 | U-factor | 0.47 | 0.41 | 0.27 | 0.37 | 0.14 | |
C-factor | 0.77 | 0.62 | 0.35 | 0.55 | 0.16 | ||
R_{u} | 2.15 | 2.46 | 3.73 | 2.67 | 6.94 | ||
R_{c} | 1.30 | 1.61 | 2.88 | 1.82 | 6.09 | ||
HC | 19.7 | 11.9 | 12.4 | 7.3 | 8.1 | ||
105 | U-factor | 0.49 | 0.43 | 0.29 | 0.39 | 0.16 | |
C-factor | 0.85 | 0.68 | 0.39 | 0.59 | 0.19 | ||
R_{u} | 2.03 | 2.33 | 3.45 | 2.54 | 6.17 | ||
R_{c} | 1.18 | 1.48 | 2.60 | 1.69 | 5.32 | ||
HC | 20.4 | 12.6 | 13.1 | 8.0 | 8.8 | ||
10 in. Block | 115 | U-factor | 0.52 | 0.45 | 0.31 | 0.41 | 0.18 |
C-factor | 0.92 | 0.73 | 0.42 | 0.64 | 0.21 | ||
R_{u} | 1.94 | 2.22 | 3.21 | 2.42 | 5.52 | ||
R_{c} | 1.09 | 1.37 | 2.36 | 1.57 | 4.67 | ||
HC | 21.1 | 13.4 | 13.9 | 8.7 | 9.5 | ||
125 | U-factor | 0.54 | 0.48 | 0.34 | 0.44 | 0.21 | |
C-factor | 1.01 | 0.80 | 0.48 | 0.70 | 0.25 | ||
R_{u} | 1.84 | 2.10 | 2.95 | 2.28 | 4.81 | ||
R_{c} | 0.99 | 1.25 | 2.10 | 1.43 | 3.96 | ||
HC | 21.8 | 14.1 | 14.6 | 9.4 | 10.2 | ||
135 | U-factor | 0.58 | 0.51 | 0.38 | 0.47 | 0.25 | |
C-factor | 1.14 | 0.90 | 0.56 | 0.79 | 0.32 | ||
R_{u} | 1.72 | 1.96 | 2.64 | 2.12 | 4.00 | ||
R_{c} | 0.87 | 1.11 | 1.79 | 1.27 | 3.15 | ||
HC | 22.6 | 14.8 | 15.3 | 10.2 | 11.0 | ||
12 in. Block | 85 | U-factor | 0.40 | 0.36 | 0.22 | 0.34 | 0.11 |
C-factor | 0.59 | 0.52 | 0.27 | 0.48 | 0.12 | ||
R_{u} | 2.53 | 2.77 | 4.59 | 2.93 | 9.43 | ||
R_{c} | 1.68 | 1.92 | 3.74 | 2.08 | 8.58 | ||
HC | 23.1 | 13.3 | 14.0 | 7.5 | 8.5 | ||
95 | U-factor | 0.42 | 0.38 | 0.24 | 0.36 | 0.12 | |
C-factor | 0.66 | 0.57 | 0.30 | 0.52 | 0.13 | ||
R_{u} | 2.30 | 2.60 | 4.22 | 2.76 | 8.33 | ||
R_{c} | 1.53 | 1.75 | 3.37 | 1.91 | 7.48 | ||
HC | 23.9 | 14.2 | 14.8 | 8.3 | 9.3 | ||
105 | U-factor | 0.44 | 0.41 | 0.26 | 0.38 | 0.14 | |
C-factor | 0.71 | 0.62 | 0.33 | 0.57 | 0.15 | ||
R_{u} | 2.25 | 2.47 | 3.90 | 2.62 | 7.35 | ||
R_{c} | 1.40 | 1.62 | 3.05 | 1.77 | 6.50 | ||
HC | 24.7 | 15.0 | 15.6 | 9.1 | 10.2 | ||
115 | U-factor | 0.47 | 0.42 | 0.28 | 0.40 | 0.15 | |
C-factor | 0.77 | 0.66 | 0.36 | 0.61 | 0.18 | ||
R_{u} | 2.15 | 2.36 | 3.63 | 2.49 | 6.54 | ||
R_{c} | 1.30 | 1.51 | 2.78 | 1.64 | 5.69 | ||
HC | 25.6 | 15.8 | 16.4 | 10.0 | 11.0 | ||
125 | U-factor | 0.49 | 0.45 | 0.30 | 0.42 | 0.18 | |
C-factor | 0.84 | 0.72 | 0.40 | 0.66 | 0.21 | ||
R_{u} | 2.04 | 2.23 | 3.34 | 2.36 | 5.68 | ||
R_{c} | 1.19 | 1.38 | 2.49 | 1.51 | 4.83 | ||
HC | 26.4 | 16.6 | 17.3 | 10.8 | 11.8 | ||
135 | U-factor | 0.52 | 0.48 | 0.34 | 0.46 | 0.21 | |
C-factor | 0.94 | 0.81 | 0.47 | 0.74 | 0.26 | ||
R_{u} | 1.91 | 2.08 | 2.98 | 2.19 | 4.67 | ||
R_{c} | 1.06 | 1.23 | 2.13 | 1.34 | 3.82 | ||
HC | 27.2 | 17.5 | 18.1 | 11.6 | 12.6 |
TABLE A3.1-4 Effective R-Values for Insulation/Framing Layers Added to Above-Grade Mass Walls and Below-Grade Walls
Depth, in. | Framing Type | Rated R-Value of Insulation | |||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | ||
Effective R-value if Continuous Insulation Uninterrupted by Framing (Includes Gypsum Board) | |||||||||||||||||||||||||||
None | 0.5 | 1.5 | 2.5 | 3.5 | 4.5 | 5.5 | 6.5 | 7.5 | 8.5 | 9.5 | 10.5 | 11.5 | 12.5 | 13.5 | 14.5 | 15.5 | 16.5 | 17.5 | 18.5 | 19.5 | 20.5 | 21.5 | 22.5 | 23.5 | 24.5 | 25.5 | |
Effective R-value if Insulation is Installed in Cavity between Framing (Includes Gypsum Board) | |||||||||||||||||||||||||||
0.5 | Wood | 1.3 | 1.3 | 1.9 | 2.4 | 2.7 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
Metal | 0.9 | 0.9 | 1.1 | 1.1 | 1.2 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
0.75 | Wood | 1.4 | 1.4 | 2.1 | 2.7 | 3.1 | 3.5 | 3.8 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
Metal | 1.0 | 1.0 | 1.3 | 1.4 | 1.5 | 1.5 | 1.6 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
1.0 | Wood | 1.3 | 1.5 | 2.2 | 2.9 | 3.4 | 3.9 | 4.3 | 4.6 | 4.9 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
Metal | 1.0 | 1.1 | 1.4 | 1.6 | 1.7 | 1.8 | 1.8 | 1.9 | 1.9 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
1.5 | Wood | 1.3 | 1.5 | 2.4 | 3.1 | 3.8 | 4.4 | 4.9 | 5.4 | 5.8 | 6.2 | 6.5 | 6.8 | 7.1 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
Metal | 1.1 | 1.2 | 1.6 | 1.9 | 2.1 | 2.2 | 2.3 | 2.4 | 2.5 | 2.5 | 2.6 | 2.6 | 2.7 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
2.0 | Wood | 1.4 | 1.5 | 2.5 | 3.3 | 4.0 | 4.7 | 5.3 | 5.9 | 6.4 | 6.9 | 7.3 | 7.7 | 8.1 | 8.4 | 8.7 | 9.0 | 9.3 | NA | NA | NA | NA | NA | NA | NA | NA | NA |
Metal | 1.1 | 1.2 | 1.7 | 2.1 | 2.3 | 2.5 | 2.7 | 2.8 | 2.9 | 3.0 | 3.1 | 3.2 | 3.2 | 3.3 | 3.3 | 3.4 | 3.4 | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
2.5 | Wood | 1.4 | 1.5 | 2.5 | 3.4 | 4.2 | 4.9 | 5.6 | 6.3 | 6.8 | 7.4 | 7.9 | 8.4 | 8.8 | 9.2 | 9.6 | 10.0 | 10.3 | 10.6 | 10.9 | 11.2 | 11.5 | NA | NA | NA | NA | NA |
Metal | 1.2 | 1.3 | 1.8 | 2.3 | 2.6 | 2.8 | 3.0 | 3.2 | 3.3 | 3.5 | 3.6 | 3.6 | 3.7 | 3.8 | 3.9 | 3.9 | 4.0 | 4.0 | 4.1 | 4.1 | 4.1 | NA | NA | NA | NA | NA | |
3.0 | Wood | 1.4 | 1.5 | 2.5 | 3.5 | 4.3 | 5.1 | 5.8 | 6.5 | 7.2 | 7.8 | 8.3 | 8.9 | 9.4 | 9.9 | 10.3 | 10.7 | 11.1 | 11.5 | 11.9 | 12.2 | 12.5 | 12.9 | NA | NA | NA | NA |
Metal | 1.2 | 1.3 | 1.9 | 2.4 | 2.8 | 3.1 | 3.3 | 3.5 | 3.7 | 3.8 | 4.0 | 4.1 | 4.2 | 4.3 | 4.4 | 4.4 | 4.5 | 4.6 | 4.6 | 4.7 | 4.7 | 4.8 | NA | NA | NA | NA | |
3.5 | Wood | 1.4 | 1.5 | 2.6 | 3.5 | 4.4 | 5.2 | 6.0 | 6.7 | 7.4 | 8.1 | 8.7 | 9.3 | 9.8 | 10.4 | 10.9 | 11.3 | 11.8 | 12.2 | 12.6 | 13.0 | 13.4 | 13.8 | 14.1 | 14.5 | 14.8 | 15.1 |
Metal | 1.2 | 1.3 | 2.0 | 2.5 | 2.9 | 3.2 | 3.5 | 3.8 | 4.0 | 4.2 | 4.3 | 4.5 | 4.6 | 4.7 | 4.8 | 4.9 | 5.0 | 5.1 | 5.1 | 5.2 | 5.2 | 5.3 | 5.4 | 5.4 | 5.4 | 5.5 | |
4.0 | Wood | 1.4 | 1.6 | 2.6 | 3.6 | 4.5 | 5.3 | 6.1 | 6.9 | 7.6 | 8.3 | 9.0 | 9.6 | 10.2 | 10.8 | 11.3 | 11.9 | 12.4 | 12.8 | 13.3 | 13.7 | 14.2 | 14.6 | 14.9 | 15.3 | 15.7 | 16.0 |
Metal | 1.2 | 1.3 | 2.0 | 2.6 | 3.0 | 3.4 | 3.7 | 4.0 | 4.2 | 4.5 | 4.6 | 4.8 | 5.0 | 5.1 | 5.2 | 5.3 | 5.4 | 5.5 | 5.6 | 5.7 | 5.8 | 5.8 | 5.9 | 5.9 | 6.0 | 6.0 | |
4.5 | Wood | 1.4 | 1.6 | 2.6 | 3.6 | 4.5 | 5.4 | 6.2 | 7.1 | 7.8 | 8.5 | 9.2 | 9.9 | 10.5 | 11.2 | 11.7 | 12.3 | 12.8 | 13.3 | 13.8 | 14.3 | 14.8 | 15.2 | 15.7 | 16.1 | 16.5 | 16.9 |
Metal | 1.2 | 1.3 | 2.1 | 2.6 | 3.1 | 3.5 | 3.9 | 4.2 | 4.5 | 4.7 | 4.9 | 5.1 | 5.3 | 5.4 | 5.6 | 5.7 | 5.8 | 5.9 | 6.0 | 6.1 | 6.2 | 6.3 | 6.4 | 6.4 | 6.5 | 6.6 | |
5.0 | Wood | 1.4 | 1.6 | 2.6 | 3.6 | 4.6 | 5.5 | 6.3 | 7.2 | 8.0 | 8.7 | 9.4 | 10.1 | 10.8 | 11.5 | 12.1 | 12.7 | 13.2 | 13.8 | 14.3 | 14.8 | 15.3 | 15.8 | 16.3 | 16.7 | 17.2 | 17.6 |
Metal | 1.2 | 1.4 | 2.1 | 2.7 | 3.2 | 3.7 | 4.1 | 4.4 | 4.7 | 5.0 | 5.2 | 5.4 | 5.6 | 5.8 | 5.9 | 6.1 | 6.2 | 6.3 | 6.5 | 6.6 | 6.7 | 6.8 | 6.8 | 6.9 | 7.0 | 7.1 | |
5.5 | Wood | 1.4 | 1.6 | 2.6 | 3.6 | 4.6 | 5.5 | 6.4 | 7.3 | 8.1 | 8.9 | 9.6 | 10.3 | 11.0 | 11.7 | 12.4 | 13.0 | 13.6 | 14.2 | 14.7 | 15.3 | 15.8 | 16.3 | 16.8 | 17.3 | 17.8 | 18.2 |
Metal | 1.3 | 1.4 | 2.1 | 2.8 | 3.3 | 3.8 | 4.2 | 4.6 | 4.9 | 5.2 | 5.4 | 5.7 | 5.9 | 6.1 | 6.3 | 6.4 | 6.6 | 6.7 | 6.8 | 7.0 | 7.1 | 7.2 | 7.3 | 7.4 | 7.5 | 7.6 |
- Concrete wall: 8 in. normal weight concrete wall with a density of 145 lb/ft^{3}.
- Solid grouted concrete block wall: 8 in. medium weight ASTM C90 concrete block with a density of 115 lb/ft^{3} and solid grouted cores.
- Partially grouted concrete block wall: 8 in. medium weight ASTM C90 concrete block with a density of 115 lb/ft^{3} having reinforcing steel every 32 in. vertically and every 48 in. horizontally, with cores grouted in those areas only. Other cores are filled with insulating material only if there is no other insulation.
- If the mass wall is uninsulated or only the cells are insulated:
- For concrete walls, determine the U-factor from Table A3.1-2 based on the concrete density and wall thickness.
- For concrete block walls, determine the U-factor from Table A3.1-3 based on the block size, concrete density, degree of grouting in the cells, and whether the cells are insulated.
- If the mass wall has additional insulation:
- For concrete walls, determine the R_{u} from Table A3.1-2 based on the concrete density and wall thickness. Next, determine the effective R-value for the insulation/framing layer from Table A3.1-4 based on the rated R-value of insulation installed, the thickness of the insulation, and whether it is installed between wood or metal framing or with no framing. Then, determine the U-factor by adding the R_{u} and the effective R-value together and taking the inverse of the total.
- For concrete block walls, determine the R_{u} from Table A3.1-3 based on the block size, concrete density, degree of grouting in the cells, and whether the cells are insulated. Next, determine the effective R-value for the insulation/framing layer from Table A3.1-4 based on the rated R-value of insulation installed, the thickness of the insulation, and whether it is installed between wood or metal framing or with no framing. Then, determine the U-factor by adding the R_{u} and the effective R-value together and taking the inverse of the total.
TABLE A3.2.3 Assembly U-Factors for Metal Building Walls
Insulation System | Rated R-Value of Insulation | Overall U-Factor for Entire Base Wall Assembly | Overall U-Factor for Assembly of Base Wall Plus Continuous Insulation (Uninterrupted by Framing) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
R-6.5 | R-9.8 | R-13 | R-15.8 | R-19 | R-22.1 | R-25 | R-32 | R-38 | |||
Single Layer of Mineral Fiber | |||||||||||
None | 1.180 | 0.136 | 0.094 | 0.072 | 0.060 | 0.050 | 0.044 | 0.039 | 0.030 | 0.026 | |
R-10 | 0.186 | 0.084 | 0.066 | 0.054 | 0.047 | 0.041 | 0.036 | 0.033 | 0.027 | 0.023 | |
R-11 | 0.185 | 0.084 | 0.066 | 0.054 | 0.047 | 0.041 | 0.036 | 0.033 | 0.027 | 0.023 | |
R-13 | 0.162 | 0.079 | 0.063 | 0.052 | 0.046 | 0.040 | 0.035 | 0.032 | 0.026 | 0.023 | |
R-16 | 0.155 | 0.077 | 0.062 | 0.051 | 0.045 | 0.039 | 0.035 | 0.032 | 0.026 | 0.022 | |
R-19 | 0.147 | 0.075 | 0.060 | 0.050 | 0.044 | 0.039 | 0.035 | 0.031 | 0.026 | 0.022 |
- Standard framing: steel stud framing at 16 in. on center with cavities filled with 16 in. wide insulation for both 3.5 in. deep and 6.0 in. deep wall cavities.
- Advanced framing: steel stud framing at 24 in. on center with cavities filled with 24 in. wide insulation for both 3.5 in. deep and 6.0 in. deep wall cavities.
TABLE A3.3.3.1 Assembly U-Factors for Steel-Frame Walls
Framing Type and Spacing Width (Actual Depth) |
Cavity Insulation R-Value: Rated (Effective Installed [see Table A9.2B]) |
Overall U-Factor for Entire Base Wall Assembly |
Overall U-Factor for Assembly of Base Wall Plus Continuous Insulation (Uninterrupted by Framing) Rated R-Value of Continuous Insulation |
|||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
R-1.00 | R-2.00 | R-3.00 | R-4.00 | R-5.00 | R-6.00 | R-7.00 | R-8.00 | R-9.00 | R-10.00 | R-11.00 | R-12.00 | R-13.00 | R-14.00 | R-15.00 | R-20.00 | R-25.00 | R-30.00 | R-35.00 | R-40.00 | |||
Steel Framing at 16 in. on Center | ||||||||||||||||||||||
3.5 in. depth | None (0.0) | 0.352 | 0.260 | 0.207 | 0.171 | 0.146 | 0.128 | 0.113 | 0.102 | 0.092 | 0.084 | 0.078 | 0.072 | 0.067 | 0.063 | 0.059 | 0.056 | 0.044 | 0.036 | 0.030 | 0.026 | 0.023 |
R-11 (5.5) | 0.132 | 0.117 | 0.105 | 0.095 | 0.087 | 0.080 | 0.074 | 0.069 | 0.064 | 0.060 | 0.057 | 0.054 | 0.051 | 0.049 | 0.046 | 0.044 | 0.036 | 0.031 | 0.027 | 0.024 | 0.021 | |
R-13 (6.0) | 0.124 | 0.111 | 0.100 | 0.091 | 0.083 | 0.077 | 0.071 | 0.066 | 0.062 | 0.059 | 0.055 | 0.052 | 0.050 | 0.048 | 0.045 | 0.043 | 0.036 | 0.030 | 0.026 | 0.023 | 0.021 | |
R-15 (6.4) | 0.118 | 0.106 | 0.096 | 0.087 | 0.080 | 0.074 | 0.069 | 0.065 | 0.061 | 0.057 | 0.054 | 0.051 | 0.049 | 0.047 | 0.045 | 0.043 | 0.035 | 0.030 | 0.026 | 0.023 | 0.021 | |
6.0 in. depth | R-19 (7.1) | 0.109 | 0.099 | 0.090 | 0.082 | 0.076 | 0.071 | 0.066 | 0.062 | 0.058 | 0.055 | 0.052 | 0.050 | 0.047 | 0.045 | 0.043 | 0.041 | 0.034 | 0.029 | 0.026 | 0.023 | 0.020 |
R-21 (7.4) | 0.106 | 0.096 | 0.087 | 0.080 | 0.074 | 0.069 | 0.065 | 0.061 | 0.057 | 0.054 | 0.051 | 0.049 | 0.047 | 0.045 | 0.043 | 0.041 | 0.034 | 0.029 | 0.025 | 0.022 | 0.020 | |
Steel Framing at 24 in. on Center | ||||||||||||||||||||||
3.5 in. depth | None (0.0) | 0.338 | 0.253 | 0.202 | 0.168 | 0.144 | 0.126 | 0.112 | 0.100 | 0.091 | 0.084 | 0.077 | 0.072 | 0.067 | 0.063 | 0.059 | 0.056 | 0.044 | 0.036 | 0.030 | 0.026 | 0.023 |
R-11 (6.6) | 0.116 | 0.104 | 0.094 | 0.086 | 0.079 | 0.073 | 0.068 | 0.064 | 0.060 | 0.057 | 0.054 | 0.051 | 0.048 | 0.046 | 0.044 | 0.042 | 0.035 | 0.030 | 0.026 | 0.023 | 0.021 | |
R-13 (7.2) | 0.108 | 0.098 | 0.089 | 0.082 | 0.075 | 0.070 | 0.066 | 0.062 | 0.058 | 0.055 | 0.052 | 0.049 | 0.047 | 0.045 | 0.043 | 0.041 | 0.034 | 0.029 | 0.025 | 0.023 | 0.020 | |
R-15 (7.8) | 0.102 | 0.092 | 0.084 | 0.078 | 0.072 | 0.067 | 0.063 | 0.059 | 0.056 | 0.053 | 0.050 | 0.048 | 0.046 | 0.044 | 0.042 | 0.040 | 0.034 | 0.029 | 0.025 | 0.022 | 0.020 | |
6.0 in. depth | R-19 (8.6) | 0.094 | 0.086 | 0.079 | 0.073 | 0.068 | 0.064 | 0.060 | 0.057 | 0.054 | 0.051 | 0.048 | 0.046 | 0.044 | 0.042 | 0.041 | 0.039 | 0.033 | 0.028 | 0.025 | 0.022 | 0.020 |
R-21 (9.0) | 0.090 | 0.083 | 0.077 | 0.071 | 0.066 | 0.062 | 0.059 | 0.055 | 0.052 | 0.050 | 0.048 | 0.045 | 0.043 | 0.042 | 0.040 | 0.038 | 0.032 | 0.028 | 0.024 | 0.022 | 0.020 |
- Standard framing: wood framing at 16 in. on center with cavities filled with 14.5 in. wide insulation for both 3.5 in. deep and 5.5 in. deep wall cavities. Double headers leave no cavity. Weighting factors are 75% insulated cavity, 21% studs, plates, and sills, and 4% headers.
- Advanced framing: wood framing at 24 in. on center with cavities filled with 22.5 in. wide insulation for both 3.5 in. deep and 5.5 in. deep wall cavities. Double headers leave uninsulated cavities. Weighting factors are 78% insulated cavity, 18% studs, plates, and sills, and 4% headers.
- Advanced framing with insulated headers: wood framing at 24 in. on center with cavities filled with 22.5 in. wide insulation for both 3.5 in. deep and 5.5 in. deep wall cavities. Double header cavities are insulated. Weighting factors are 78% insulated cavity, 18% studs, plates, and sills, and 4% headers.
TABLE A3.4.3.1 Assembly U-Factors for Wood-Frame Walls
Framing Type and Spacing Width (Actual Depth) | Cavity Insulation R-Value: Rated (Effective Installed [see Table A9.4C]) | Overall U-Factor for Entire Base Wall Assembly | Overall U-Factor for Assembly of Base Wall Plus Continuous Insulation (Uninterrupted by Framing) Rated R-Value of Continuous Insulation | |||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
R-1.00 | R-2.00 | R-3.00 | R-4.00 | R-5.00 | R-6.00 | R-7.00 | R-8.00 | R-9.00 | R-10.00 | R-11.00 | R-12.00 | R-13.00 | R-14.00 | R-15.00 | R-20.00 | R-25.00 | R-30.00 | R-35.00 | R-40.00 | |||
Wood Studs at 16 in. on Center | ||||||||||||||||||||||
3.5 in. depth | None (0.0) | 0.292 | 0.223 | 0.181 | 0.152 | 0.132 | 0.116 | 0.104 | 0.094 | 0.086 | 0.079 | 0.073 | 0.068 | 0.064 | 0.060 | 0.056 | 0.053 | 0.042 | 0.035 | 0.030 | 0.026 | 0.023 |
R-11 (11.0) | 0.096 | 0.087 | 0.079 | 0.073 | 0.068 | 0.063 | 0.059 | 0.056 | 0.053 | 0.050 | 0.048 | 0.046 | 0.044 | 0.042 | 0.040 | 0.038 | 0.032 | 0.028 | 0.024 | 0.022 | 0.020 | |
R-13 (13.0) | 0.089 | 0.080 | 0.074 | 0.068 | 0.063 | 0.059 | 0.056 | 0.053 | 0.050 | 0.047 | 0.045 | 0.043 | 0.041 | 0.040 | 0.038 | 0.037 | 0.031 | 0.027 | 0.024 | 0.021 | 0.019 | |
R-15 (15.0) | 0.083 | 0.075 | 0.069 | 0.064 | 0.060 | 0.056 | 0.053 | 0.050 | 0.047 | 0.045 | 0.043 | 0.041 | 0.039 | 0.038 | 0.036 | 0.035 | 0.030 | 0.026 | 0.023 | 0.020 | 0.019 | |
5.5 in. depth | R-19 (18.0) | 0.067 | 0.062 | 0.058 | 0.054 | 0.051 | 0.048 | 0.046 | 0.044 | 0.042 | 0.040 | 0.038 | 0.037 | 0.036 | 0.034 | 0.033 | 0.032 | 0.027 | 0.024 | 0.021 | 0.019 | 0.018 |
R-21 (21.0) | 0.063 | 0.058 | 0.054 | 0.051 | 0.048 | 0.045 | 0.043 | 0.041 | 0.039 | 0.038 | 0.036 | 0.035 | 0.034 | 0.032 | 0.031 | 0.030 | 0.026 | 0.023 | 0.021 | 0.019 | 0.017 | |
+ R-10 headers | R-19 (18.0) | 0.063 | 0.059 | 0.055 | 0.052 | 0.049 | 0.047 | 0.045 | 0.043 | 0.041 | 0.039 | 0.038 | 0.036 | 0.035 | 0.034 | 0.033 | 0.031 | 0.027 | 0.024 | 0.021 | 0.019 | 0.017 |
R-21 (21.0) | 0.059 | 0.055 | 0.051 | 0.049 | 0.046 | 0.044 | 0.042 | 0.040 | 0.038 | 0.037 | 0.035 | 0.034 | 0.033 | 0.032 | 0.031 | 0.030 | 0.026 | 0.023 | 0.020 | 0.018 | 0.017 | |
Wood Studs at 24 in. on Center | ||||||||||||||||||||||
3.5 in. depth | None (0.0) | 0.298 | 0.227 | 0.183 | 0.154 | 0.133 | 0.117 | 0.105 | 0.095 | 0.086 | 0.079 | 0.074 | 0.068 | 0.064 | 0.060 | 0.057 | 0.054 | 0.042 | 0.035 | 0.030 | 0.026 | 0.023 |
R-11 (11.0) | 0.094 | 0.085 | 0.078 | 0.072 | 0.067 | 0.062 | 0.059 | 0.055 | 0.052 | 0.050 | 0.047 | 0.045 | 0.043 | 0.041 | 0.040 | 0.038 | 0.032 | 0.027 | 0.024 | 0.022 | 0.019 | |
R-13 (13.0) | 0.086 | 0.078 | 0.072 | 0.067 | 0.062 | 0.058 | 0.055 | 0.052 | 0.049 | 0.047 | 0.045 | 0.043 | 0.041 | 0.039 | 0.038 | 0.036 | 0.031 | 0.026 | 0.023 | 0.021 | 0.019 | |
R-15 (15.0) | 0.080 | 0.073 | 0.067 | 0.062 | 0.058 | 0.055 | 0.052 | 0.049 | 0.046 | 0.044 | 0.042 | 0.040 | 0.039 | 0.037 | 0.036 | 0.035 | 0.029 | 0.026 | 0.023 | 0.020 | 0.018 | |
5.5 in. depth | R-19 (18.0) | 0.065 | 0.060 | 0.056 | 0.053 | 0.050 | 0.047 | 0.045 | 0.043 | 0.041 | 0.039 | 0.038 | 0.036 | 0.035 | 0.034 | 0.033 | 0.032 | 0.027 | 0.024 | 0.021 | 0.019 | 0.018 |
R-21 (21.0) | 0.060 | 0.056 | 0.052 | 0.049 | 0.046 | 0.044 | 0.042 | 0.040 | 0.038 | 0.037 | 0.036 | 0.034 | 0.033 | 0.032 | 0.031 | 0.030 | 0.026 | 0.023 | 0.020 | 0.018 | 0.017 | |
+ R-10 headers | R-19 (18.0) | 0.062 | 0.058 | 0.054 | 0.051 | 0.048 | 0.046 | 0.044 | 0.042 | 0.040 | 0.039 | 0.037 | 0.036 | 0.034 | 0.033 | 0.032 | 0.031 | 0.027 | 0.024 | 0.021 | 0.019 | 0.017 |
R-21 (21.0) | 0.057 | 0.053 | 0.050 | 0.047 | 0.045 | 0.043 | 0.041 | 0.039 | 0.037 | 0.036 | 0.035 | 0.033 | 0.032 | 0.031 | 0.030 | 0.029 | 0.025 | 0.023 | 0.020 | 0.018 | 0.017 |
TABLE A4.2.1 Assembly C-Factors for Below-Grade Walls
Framing Type and Depth | Rated R-Value of Insulation Alone | Specified C-Factors (Wall Only, without Soil and Air Films) |
---|---|---|
No Framing | R-0 | C-1.140 |
Exterior Insulation, Continuous and Uninterrupted by Framing | ||
No Framing | R-5.0 | C-0.170 |
No Framing | R-7.5 | C-0.119 |
No Framing | R-10.0 | C-0.092 |
No Framing | R-12.5 | C-0.075 |
No Framing | R-15.0 | C-0.063 |
No Framing | R-17.5 | C-0.054 |
No Framing | R-20.0 | C-0.048 |
No Framing | R-25.0 | C-0.039 |
No Framing | R-30.0 | C-0.032 |
No Framing | R-35.0 | C-0.028 |
No Framing | R-40.0 | C-0.025 |
No Framing | R-45.0 | C-0.022 |
No Framing | R-50.0 | C-0.020 |
Continuous Metal Framing at 24 in. on Center Horizontally | ||
3.5 in. | R-11.0 | C-0.182 |
3.5 in. | R-13.0 | C-0.174 |
3.5 in. | R-15.0 | C-0.168 |
5.5 in. | R-19.0 | C-0.125 |
5.5 in. | R-21.0 | C-0.120 |
1 in. Metal Clips at 24 in. on Center Horizontally and 16 in. Vertically | ||
1.0 in. | R-3.8 | C-0.233 |
1.0 in. | R-5.0 | C-0.201 |
1.0 in. | R-5.6 | C-0.189 |
1.5 in. | R-5.7 | C-0.173 |
1.5 in. | R-7.5 | C-0.147 |
1.5 in. | R-8.4 | C-0.138 |
2.0 in. | R-7.6 | C-0.138 |
2.0 in. | R-10.0 | C-0.116 |
2.0 in. | R-11.2 | C-0.108 |
2.5 in. | R-9.5 | C-0.114 |
2.5 in. | R-12.5 | C-0.096 |
2.5 in. | R-14.0 | C-0.089 |
3.0 in. | R-11.4 | C-0.098 |
3.0 in. | R-15.0 | C-0.082 |
3.0 in. | R-16.8 | C-0.076 |
3.5 in. | R-13.3 | C-0.085 |
3.5 in. | R-17.5 | C-0.071 |
3.5 in. | R-19.6 | C-0.066 |
4.0 in. | R-15.2 | C-0.076 |
4.0 in. | R-20.0 | C-0.063 |
4.0 in. | R-22.4 | C-0.058 |
- If the below-grade wall is uninsulated or only the cells are insulated:
- For concrete walls, determine the C-factor from Table A3.1-2 based on the concrete density and wall thickness.
- For concrete block walls, determine the C-factor from Table A3.1-3 based on the block size, concrete density, degree of grouting in the cells, and whether the cells are insulated.
- If the mass wall has additional insulation:
- For concrete walls, determine the R_{c} from Table A3.1-2 based on the concrete density and wall thickness. Next, determine the effective R-value for the insulation/framing layer from Table A3.1-4 based on the rated R-value of insulation installed, the thickness of the insulation, and whether it is installed between wood or metal framing or with no framing. Then, determine the C-factor by adding the R_{c} and the effective R-value together and taking the inverse of the total.
- For concrete block walls, determine the R_{c} from Table A3.1-3 based on the block size, concrete density, degree of grouting in the cells, and whether the cells are insulated. Next, determine the effective R-value for the insulation/framing layer from Table A3.1-4 based on the rated R-value of insulation installed, the thickness of the insulation, and whether it is installed between wood or metal framing or with no framing. Then, determine the C-factor by adding the R_{c} and the effective R-value together and taking the inverse of the total.
TABLE A5.2.3.1 Assembly U-Factors for Mass Floors
Framing Type and Spacing Width (Actual Depth) | Cavity Insulation R-Value: Rated (Effective Installed) | Overall U-Factor for Entire Base Floor Assembly | Overall U-Factor for Assembly of Base Floor Plus Continuous Insulation (Uninterrupted by Framing) | |||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Rated R-Value of Continuous Insulation | ||||||||||||||||||||||
R-1.00 | R-2.00 | R-3.00 | R-4.00 | R-5.00 | R-6.00 | R-7.00 | R-8.00 | R-9.00 | R-10.00 | R-11.00 | R-12.00 | R-13.00 | R-14.00 | R-15.00 | R-20.00 | R-25.00 | R-30.00 | R-35.00 | R-40.00 | |||
Concrete Floor with Rigid Foam | ||||||||||||||||||||||
None (0.0) | 0.322 | 0.243 | 0.196 | 0.164 | 0.141 | 0.123 | 0.110 | 0.099 | 0.090 | 0.083 | 0.076 | 0.071 | 0.066 | 0.062 | 0.058 | 0.055 | 0.043 | 0.036 | 0.030 | 0.026 | 0.023 | |
Concrete Floor with Pinned Boards | ||||||||||||||||||||||
R-4.2 (4.2) | 0.137 | 0.121 | 0.108 | 0.097 | 0.089 | 0.081 | 0.075 | 0.070 | 0.065 | 0.061 | 0.058 | 0.055 | 0.052 | 0.049 | 0.047 | 0.045 | 0.037 | 0.031 | 0.027 | 0.024 | 0.021 | |
R-6.3 (6.3) | 0.107 | 0.096 | 0.088 | 0.081 | 0.075 | 0.070 | 0.065 | 0.061 | 0.058 | 0.054 | 0.052 | 0.049 | 0.047 | 0.045 | 0.043 | 0.041 | 0.034 | 0.029 | 0.025 | 0.023 | 0.020 | |
R-8.3 (8.3) | 0.087 | 0.080 | 0.074 | 0.069 | 0.065 | 0.061 | 0.057 | 0.054 | 0.051 | 0.049 | 0.047 | 0.045 | 0.043 | 0.041 | 0.039 | 0.038 | 0.032 | 0.027 | 0.024 | 0.022 | 0.019 | |
R-10.4 (10.4) | 0.074 | 0.069 | 0.064 | 0.060 | 0.057 | 0.054 | 0.051 | 0.049 | 0.046 | 0.044 | 0.042 | 0.041 | 0.039 | 0.038 | 0.036 | 0.035 | 0.030 | 0.026 | 0.023 | 0.021 | 0.019 | |
R-12.5 (12.5) | 0.064 | 0.060 | 0.057 | 0.054 | 0.051 | 0.048 | 0.046 | 0.044 | 0.042 | 0.041 | 0.039 | 0.038 | 0.036 | 0.035 | 0.034 | 0.033 | 0.028 | 0.025 | 0.022 | 0.020 | 0.018 | |
R-14.6 (14.6) | 0.056 | 0.053 | 0.051 | 0.048 | 0.046 | 0.044 | 0.042 | 0.040 | 0.039 | 0.037 | 0.036 | 0.035 | 0.034 | 0.033 | 0.032 | 0.031 | 0.027 | 0.023 | 0.021 | 0.019 | 0.017 | |
R-16.7 (16.7) | 0.051 | 0.048 | 0.046 | 0.044 | 0.042 | 0.040 | 0.039 | 0.037 | 0.036 | 0.035 | 0.034 | 0.032 | 0.031 | 0.030 | 0.030 | 0.029 | 0.025 | 0.022 | 0.020 | 0.018 | 0.017 | |
Concrete Floor with Spray-On Insulation | ||||||||||||||||||||||
1 in. | R-4 (4.0) | 0.141 | 0.123 | 0.110 | 0.099 | 0.090 | 0.083 | 0.076 | 0.071 | 0.066 | 0.062 | 0.058 | 0.055 | 0.052 | 0.050 | 0.047 | 0.045 | 0.037 | 0.031 | 0.027 | 0.024 | 0.021 |
2 in. | R-8 (8.0) | 0.090 | 0.083 | 0.076 | 0.071 | 0.066 | 0.062 | 0.058 | 0.055 | 0.052 | 0.050 | 0.047 | 0.045 | 0.043 | 0.041 | 0.040 | 0.038 | 0.032 | 0.028 | 0.024 | 0.022 | 0.020 |
3 in. | R-12 (12.0) | 0.066 | 0.062 | 0.058 | 0.055 | 0.052 | 0.050 | 0.047 | 0.045 | 0.043 | 0.041 | 0.040 | 0.038 | 0.037 | 0.036 | 0.034 | 0.033 | 0.028 | 0.025 | 0.022 | 0.020 | 0.018 |
4 in. | R-16 (16.0) | 0.052 | 0.050 | 0.047 | 0.045 | 0.043 | 0.041 | 0.040 | 0.038 | 0.037 | 0.036 | 0.034 | 0.033 | 0.032 | 0.031 | 0.030 | 0.029 | 0.026 | 0.023 | 0.020 | 0.018 | 0.017 |
5 in. | R-20 (20.0) | 0.043 | 0.041 | 0.040 | 0.038 | 0.037 | 0.036 | 0.034 | 0.033 | 0.032 | 0.031 | 0.030 | 0.029 | 0.028 | 0.028 | 0.027 | 0.026 | 0.023 | 0.021 | 0.019 | 0.017 | 0.016 |
6 in. | R-24 (24.0) | 0.037 | 0.036 | 0.034 | 0.033 | 0.032 | 0.031 | 0.030 | 0.029 | 0.028 | 0.028 | 0.027 | 0.026 | 0.026 | 0.025 | 0.024 | 0.024 | 0.021 | 0.019 | 0.018 | 0.016 | 0.015 |
TABLE A5.3.3.1 Assembly U-Factors for Steel-Joist Floors
Framing Type and Spacing Width (Actual Depth) | Cavity Insulation R-Value: Rated (Effective Installed [See Table A9.2-1]) | Overall U-Factor for Entire Base Floor Assembly | Overall U-Factor for Assembly of Base Floor Plus Continuous Insulation (Uninterrupted by Framing) | |||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Rated R-Value of Continuous Insulation | ||||||||||||||||||||||
R-1.00 | R-2.00 | R-3.00 | R-4.00 | R-5.00 | R-6.00 | R-7.00 | R-8.00 | R-9.00 | R-10.00 | R-11.00 | R-12.00 | R-13.00 | R-14.00 | R-15.00 | R-20.00 | R-25.00 | R-30.00 | R-35.00 | R-40.00 | |||
Steel Joist Floor with Rigid Foam | ||||||||||||||||||||||
None (0.0) | 0.350 | 0.259 | 0.206 | 0.171 | 0.146 | 0.127 | 0.113 | 0.101 | 0.092 | 0.084 | 0.078 | 0.072 | 0.067 | 0.063 | 0.059 | 0.056 | 0.044 | 0.036 | 0.030 | 0.026 | 0.023 | |
Steel Joist Floor with Spray-on Insulation | ||||||||||||||||||||||
1 in. | R-4 (3.88) | 0.148 | 0.129 | 0.114 | 0.103 | 0.093 | 0.085 | 0.078 | 0.073 | 0.068 | 0.064 | 0.060 | 0.056 | 0.053 | 0.051 | 0.048 | 0.046 | 0.037 | 0.032 | 0.027 | 0.024 | 0.021 |
2 in. | R-8 (7.52) | 0.096 | 0.088 | 0.081 | 0.075 | 0.070 | 0.065 | 0.061 | 0.058 | 0.054 | 0.052 | 0.049 | 0.047 | 0.045 | 0.043 | 0.041 | 0.039 | 0.033 | 0.028 | 0.025 | 0.022 | 0.020 |
3 in. | R-12 (10.80) | 0.073 | 0.068 | 0.064 | 0.060 | 0.057 | 0.054 | 0.051 | 0.048 | 0.046 | 0.044 | 0.042 | 0.041 | 0.039 | 0.038 | 0.036 | 0.035 | 0.030 | 0.026 | 0.023 | 0.021 | 0.019 |
4 in. | R-16 (13.92) | 0.060 | 0.056 | 0.053 | 0.051 | 0.048 | 0.046 | 0.044 | 0.042 | 0.040 | 0.039 | 0.037 | 0.036 | 0.035 | 0.034 | 0.032 | 0.031 | 0.027 | 0.024 | 0.021 | 0.019 | 0.018 |
5 in. | R-20 (17.00) | 0.050 | 0.048 | 0.046 | 0.044 | 0.042 | 0.040 | 0.039 | 0.037 | 0.036 | 0.035 | 0.033 | 0.032 | 0.031 | 0.030 | 0.030 | 0.029 | 0.025 | 0.022 | 0.020 | 0.018 | 0.017 |
6 in. | R-24 (19.68) | 0.044 | 0.042 | 0.041 | 0.039 | 0.038 | 0.036 | 0.035 | 0.034 | 0.033 | 0.032 | 0.031 | 0.030 | 0.029 | 0.028 | 0.027 | 0.027 | 0.024 | 0.021 | 0.019 | 0.017 | 0.016 |
Steel Joist Floor with Batt Insulation | ||||||||||||||||||||||
None (0.0) | 0.350 | 0.259 | 0.206 | 0.171 | 0.146 | 0.127 | 0.113 | 0.101 | 0.092 | 0.084 | 0.078 | 0.072 | 0.067 | 0.063 | 0.059 | 0.056 | 0.044 | 0.036 | 0.030 | 0.026 | 0.023 | |
R-11 (10.01) | 0.078 | 0.072 | 0.067 | 0.063 | 0.059 | 0.056 | 0.053 | 0.050 | 0.048 | 0.046 | 0.044 | 0.042 | 0.040 | 0.039 | 0.037 | 0.036 | 0.030 | 0.026 | 0.023 | 0.021 | 0.019 | |
R-13 (11.70) | 0.069 | 0.064 | 0.060 | 0.057 | 0.054 | 0.051 | 0.049 | 0.046 | 0.044 | 0.042 | 0.041 | 0.039 | 0.038 | 0.036 | 0.035 | 0.034 | 0.029 | 0.025 | 0.022 | 0.020 | 0.018 | |
R-15 (13.20) | 0.062 | 0.059 | 0.055 | 0.052 | 0.050 | 0.047 | 0.045 | 0.043 | 0.042 | 0.040 | 0.038 | 0.037 | 0.036 | 0.034 | 0.033 | 0.032 | 0.028 | 0.024 | 0.022 | 0.020 | 0.018 | |
R-19 (16.34) | 0.052 | 0.050 | 0.047 | 0.045 | 0.043 | 0.041 | 0.040 | 0.038 | 0.037 | 0.035 | 0.034 | 0.033 | 0.032 | 0.031 | 0.030 | 0.029 | 0.026 | 0.023 | 0.020 | 0.018 | 0.017 | |
R-21 (17.64) | 0.049 | 0.047 | 0.044 | 0.043 | 0.041 | 0.039 | 0.038 | 0.036 | 0.035 | 0.034 | 0.033 | 0.032 | 0.031 | 0.030 | 0.029 | 0.028 | 0.025 | 0.022 | 0.020 | 0.018 | 0.017 | |
R-25 (20.25) | 0.043 | 0.041 | 0.040 | 0.038 | 0.037 | 0.036 | 0.034 | 0.033 | 0.032 | 0.031 | 0.030 | 0.029 | 0.028 | 0.028 | 0.027 | 0.026 | 0.023 | 0.021 | 0.019 | 0.017 | 0.016 | |
R-30C (23.70) | 0.038 | 0.036 | 0.035 | 0.034 | 0.033 | 0.032 | 0.031 | 0.030 | 0.029 | 0.028 | 0.027 | 0.027 | 0.026 | 0.025 | 0.025 | 0.024 | 0.021 | 0.019 | 0.018 | 0.016 | 0.015 | |
R-30 (23.70) | 0.038 | 0.036 | 0.035 | 0.034 | 0.033 | 0.032 | 0.031 | 0.030 | 0.029 | 0.028 | 0.027 | 0.027 | 0.026 | 0.025 | 0.025 | 0.024 | 0.021 | 0.019 | 0.018 | 0.016 | 0.015 | |
R-38C (28.12) | 0.032 | 0.031 | 0.030 | 0.029 | 0.029 | 0.028 | 0.027 | 0.026 | 0.026 | 0.025 | 0.024 | 0.024 | 0.023 | 0.023 | 0.022 | 0.022 | 0.020 | 0.018 | 0.016 | 0.015 | 0.014 | |
R-38 (28.12) | 0.032 | 0.031 | 0.030 | 0.029 | 0.029 | 0.028 | 0.027 | 0.026 | 0.026 | 0.025 | 0.024 | 0.024 | 0.023 | 0.023 | 0.022 | 0.022 | 0.020 | 0.018 | 0.016 | 0.015 | 0.014 |
TABLE A5.4.3.1 Assembly U-Factors for Wood-Joist Floors
Framing Type and Spacing Width (Actual Depth) | Cavity Insulation R-Value: Rated (Effective Installed [See Table A9.2-1]) | Overall U-Factor for Entire Base Floor Assembly | Overall U-Factor for Assembly of Base Floor Plus Continuous Insulation (Uninterrupted by Framing) | |||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Rated R-Value of Continuous Insulation | ||||||||||||||||||||||
R-1.00 | R-2.00 | R-3.00 | R-4.00 | R-5.00 | R-6.00 | R-7.00 | R-8.00 | R-9.00 | R-10.00 | R-11.00 | R-12.00 | R-13.00 | R-14.00 | R-15.00 | R-20.00 | R-25.00 | R-30.00 | R-35.00 | R-40.00 | |||
Wood Joists | ||||||||||||||||||||||
5.5 in. | None (0.0) | 0.282 | 0.220 | 0.180 | 0.153 | 0.132 | 0.117 | 0.105 | 0.095 | 0.087 | 0.080 | 0.074 | 0.069 | 0.064 | 0.060 | 0.057 | 0.054 | 0.042 | 0.035 | 0.030 | 0.026 | 0.023 |
R-11 (11.0) | 0.074 | 0.069 | 0.064 | 0.060 | 0.057 | 0.054 | 0.051 | 0.048 | 0.046 | 0.044 | 0.042 | 0.040 | 0.039 | 0.037 | 0.036 | 0.035 | 0.030 | 0.026 | 0.023 | 0.020 | 0.019 | |
R-13 (13.0) | 0.066 | 0.062 | 0.058 | 0.055 | 0.052 | 0.049 | 0.047 | 0.045 | 0.043 | 0.041 | 0.039 | 0.038 | 0.036 | 0.035 | 0.034 | 0.033 | 0.028 | 0.025 | 0.022 | 0.020 | 0.018 | |
R-15 (15.0) | 0.060 | 0.057 | 0.053 | 0.050 | 0.048 | 0.046 | 0.044 | 0.042 | 0.040 | 0.038 | 0.037 | 0.036 | 0.034 | 0.033 | 0.032 | 0.031 | 0.027 | 0.024 | 0.021 | 0.019 | 0.017 | |
R-19 (18.0) | 0.051 | 0.048 | 0.046 | 0.044 | 0.042 | 0.040 | 0.038 | 0.037 | 0.036 | 0.034 | 0.033 | 0.032 | 0.031 | 0.030 | 0.029 | 0.028 | 0.025 | 0.022 | 0.020 | 0.018 | 0.017 | |
R-21 (21.0) | 0.046 | 0.043 | 0.042 | 0.040 | 0.038 | 0.037 | 0.035 | 0.034 | 0.033 | 0.032 | 0.031 | 0.030 | 0.029 | 0.028 | 0.027 | 0.027 | 0.023 | 0.021 | 0.019 | 0.017 | 0.016 | |
7.25 in. | R-25 (25.0) | 0.039 | 0.037 | 0.036 | 0.035 | 0.033 | 0.032 | 0.031 | 0.030 | 0.029 | 0.028 | 0.028 | 0.027 | 0.026 | 0.025 | 0.025 | 0.024 | 0.022 | 0.019 | 0.018 | 0.016 | 0.015 |
R-30C (30.0) | 0.034 | 0.033 | 0.032 | 0.031 | 0.030 | 0.029 | 0.028 | 0.027 | 0.026 | 0.026 | 0.025 | 0.024 | 0.024 | 0.023 | 0.023 | 0.022 | 0.020 | 0.018 | 0.016 | 0.015 | 0.014 | |
9.25 in. | R-30 (30.0) | 0.033 | 0.032 | 0.031 | 0.030 | 0.029 | 0.028 | 0.027 | 0.027 | 0.026 | 0.025 | 0.024 | 0.024 | 0.023 | 0.023 | 0.022 | 0.022 | 0.020 | 0.018 | 0.016 | 0.015 | 0.014 |
11.25 in. | R-38C (38.0) | 0.027 | 0.026 | 0.025 | 0.025 | 0.024 | 0.024 | 0.023 | 0.022 | 0.022 | 0.021 | 0.021 | 0.020 | 0.020 | 0.020 | 0.019 | 0.019 | 0.017 | 0.016 | 0.015 | 0.014 | 0.013 |
13.25 in. | R-38 (38.0) | 0.026 | 0.026 | 0.025 | 0.024 | 0.024 | 0.023 | 0.023 | 0.022 | 0.022 | 0.021 | 0.021 | 0.020 | 0.020 | 0.019 | 0.019 | 0.019 | 0.017 | 0.016 | 0.015 | 0.014 | 0.013 |
- Horizontal Insulation: continuous insulation is applied directly to the underside of the slab and extends inward horizontally from the perimeter for the distance specified or continuous insulation is applied downward from the top of the slab and then extends horizontally to the interior or the exterior from the perimeter for the distance specified.
- Vertical Insulation: continuous insulation is applied directly to the slab exterior, extending downward from the top of the slab for the distance specified.
- Fully Insulated Slab: continuous insulation extends downward from the top of the slab and along the entire perimeter and completely covers the entire area under the slab.
Exception: For a monolithic slab-on-grade floor, the insulation shall extend from the top of the slab-on-grade to the bottom of the footing.
TABLE A6.3.1 Assembly F-Factors for Slab-on-Grade Floors
Insulation Description | Rated R-Value of Insulation | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
R-0 | R-5 | R-7.5 | R-10 | R-15 | R-20 | R-25 | R-30 | R-35 | R-40 | R-45 | R-50 | R-55 | |
Unheated Slabs | |||||||||||||
None | 0.73 | ||||||||||||
12 in. horizontal | 0.72 | 0.71 | 0.71 | 0.71 | |||||||||
24 in. horizontal | 0.70 | 0.70 | 0.70 | 0.69 | |||||||||
36 in. horizontal | 0.68 | 0.67 | 0.66 | 0.66 | |||||||||
48 in. horizontal | 0.67 | 0.65 | 0.64 | 0.63 | |||||||||
12 in. vertical | 0.61 | 0.60 | 0.58 | 0.57 | 0.567 | 0.565 | 0.564 | ||||||
24 in. vertical | 0.58 | 0.56 | 0.54 | 0.52 | 0.510 | 0.505 | 0.502 | ||||||
36 in. vertical | 0.56 | 0.53 | 0.51 | 0.48 | 0.472 | 0.464 | 0.460 | ||||||
48 in. vertical | 0.54 | 0.51 | 0.48 | 0.45 | 0.434 | 0.424 | 0.419 | ||||||
Fully insulated slab | 0.46 | 0.41 | 0.36 | 0.30 | 0.261 | 0.233 | 0.213 | 0.198 | 0.186 | 0.176 | 0.168 | 0.161 | |
Heated Slabs | |||||||||||||
None | 1.35 | ||||||||||||
12 in. horizontal | 1.31 | 1.31 | 1.30 | 1.30 | |||||||||
24 in. horizontal | 1.28 | 1.27 | 1.26 | 1.25 | |||||||||
36 in. horizontal | 1.24 | 1.21 | 1.20 | 1.18 | |||||||||
48 in. horizontal | 1.20 | 1.17 | 1.13 | 1.11 | |||||||||
12 in. vertical | 1.06 | 1.02 | 1.00 | 0.98 | 0.968 | 0.964 | 0.961 | ||||||
24 in. vertical | 0.99 | 0.95 | 0.90 | 0.86 | 0.843 | 0.832 | 0.827 | ||||||
36 in. vertical | 0.95 | 0.89 | 0.84 | 0.79 | 0.762 | 0.747 | 0.740 | ||||||
48 in. vertical | 0.91 | 0.85 | 0.78 | 0.72 | 0.688 | 0.671 | 0.659 | ||||||
Fully insulated slab | 0.74 | 0.64 | 0.55 | 0.44 | 0.373 | 0.326 | 0.296 | 0.273 | 0.255 | 0.239 | 0.227 | 0.217 |
- Uninsulated single-layer metal swinging doors or non-swinging doors, including single-layer uninsulated access hatches and uninsulated smoke vents: 1.45
- Uninsulated double-layer metal swinging doors or non-swinging doors, including double-layer uninsulated access hatches and uninsulated smoke vents: 0.70
- Insulated metal swinging doors, including fire-rated doors, insulated access hatches, and insulated smoke vents: 0.50
- Wood doors, minimum nominal thickness of 1.75 in., including panel doors with minimum panel thickness of 1.125 in., solid core flush doors, and hollow core flush doors: 0.50
- Any other wood door: 0.60
All fenestration with U-factors, SHGC, or visible transmittance determined, certified, and labeled in accordance with NFRC 100, 200, and 300, respectively, shall be assigned those values.
TABLE A8.1-1 Assembly U-Factors for Unlabeled Skylights
Product Type | Sloped Installation | |||||||
---|---|---|---|---|---|---|---|---|
Unlabeled Skylight with Curb (Includes Glass/Plastic, Flat/Domed, Fixed/Operable) | Unlabeled Skylight without Curb (Includes Glass/Plastic, Flat/Domed, Fixed/Operable) | |||||||
Frame Type | Aluminum with Thermal Break | Reinforced Vinyl/Aluminum CladWood | Wood/Vinyl | Aluminum without Thermal Break | Aluminum with Thermal Break | Structural Glazing | Aluminum without Thermal Break | |
ID | Glazing Type | |||||||
Single Glazing | ||||||||
1 | 1/8 in. glass | 1.98 | 1.89 | 1.75 | 1.47 | 1.36 | 1.25 | 1.25 |
2 | 1/4 in. acrylic/polycarb | 1.82 | 1.73 | 1.60 | 1.31 | 1.21 | 1.10 | 1.10 |
3 | 1/8 in. acrylic/polycarb | 1.90 | 1.81 | 1.68 | 1.39 | 1.29 | 1.18 | 1.18 |
Double Glazing | ||||||||
4 | 1/4 in. airspace | 1.31 | 1.11 | 1.05 | 0.84 | 0.82 | 0.70 | 0.66 |
5 | 1/2 in. airspace | 1.30 | 1.10 | 1.04 | 0.84 | 0.81 | 0.69 | 0.65 |
6 | 1/4 in. argon space | 1.27 | 1.07 | 1.00 | 0.80 | 0.77 | 0.66 | 0.62 |
7 | 1/2 in. argon space | 1.27 | 1.07 | 1.00 | 0.80 | 0.77 | 0.66 | 0.62 |
Double Glazing, e = 0.60 on surface 2 or 3 | ||||||||
8 | 1/4 in. airspace | 1.27 | 1.08 | 1.01 | 0.81 | 0.78 | 0.67 | 0.63 |
9 | 1/2 in. airspace | 1.27 | 1.07 | 1.00 | 0.80 | 0.77 | 0.66 | 0.62 |
10 | 1/4 in. argon space | 1.23 | 1.03 | 0.97 | 0.76 | 0.74 | 0.63 | 0.58 |
11 | 1/2 in. argon space | 1.23 | 1.03 | 0.97 | 0.76 | 0.74 | 0.63 | 0.58 |
Double Glazing, e = 0.40 on surface 2 or 3 | ||||||||
12 | 1/4 in. airspace | 1.25 | 1.05 | 0.99 | 0.78 | 0.76 | 0.64 | 0.60 |
13 | 1/2 in. airspace | 1.24 | 1.04 | 0.98 | 0.77 | 0.75 | 0.64 | 0.59 |
14 | 1/4 in. argon space | 1.18 | 0.99 | 0.92 | 0.72 | 0.70 | 0.58 | 0.54 |
15 | 1/2 in. argon space | 1.20 | 1.00 | 0.94 | 0.74 | 0.71 | 0.60 | 0.56 |
Double Glazing, e = 0.20 on surface 2 or 3 | ||||||||
16 | 1/4 in. airspace | 1.20 | 1.00 | 0.94 | 0.74 | 0.71 | 0.60 | 0.56 |
17 | 1/2 in. airspace | 1.20 | 1.00 | 0.94 | 0.74 | 0.71 | 0.60 | 0.56 |
18 | 1/4 in. argon space | 1.14 | 0.94 | 0.88 | 0.68 | 0.65 | 0.54 | 0.50 |
19 | 1/2 in. argon space | 1.15 | 0.95 | 0.89 | 0.68 | 0.66 | 0.55 | 0.51 |
Double Glazing, e = 0.10 on surface 2 or 3 | ||||||||
20 | 1/4 in. airspace | 1.18 | 0.99 | 0.92 | 0.72 | 0.70 | 0.58 | 0.54 |
21 | 1/2 in. airspace | 1.18 | 0.99 | 0.92 | 0.72 | 0.70 | 0.58 | 0.54 |
22 | 1/4 in. argon space | 1.11 | 0.91 | 0.85 | 0.65 | 0.63 | 0.52 | 0.47 |
23 | 1/2 in. argon space | 1.13 | 0.93 | 0.87 | 0.67 | 0.65 | 0.53 | 0.49 |
Double Glazing, e = 0.05 on surface 2 or 3 | ||||||||
24 | 1/4 in. airspace | 1.17 | 0.97 | 0.91 | 0.70 | 0.68 | 0.57 | 0.52 |
25 | 1/2 in. airspace | 1.17 | 0.98 | 0.91 | 0.71 | 0.69 | 0.58 | 0.53 |
26 | 1/4 in. argon space | 1.09 | 0.89 | 0.83 | 0.63 | 0.61 | 0.50 | 0.45 |
27 | 1/2 in. argon space | 1.11 | 0.91 | 0.85 | 0.65 | 0.63 | 0.52 | 0.47 |
Triple Glazing | ||||||||
28 | 1/4 in. airspaces | 1.12 | 0.89 | 0.84 | 0.64 | 0.64 | 0.53 | 0.48 |
29 | 1/2 in. airspaces | 1.10 | 0.87 | 0.81 | 0.61 | 0.62 | 0.51 | 0.45 |
30 | 1/4 in. argon spaces | 1.09 | 0.86 | 0.80 | 0.60 | 0.61 | 0.50 | 0.44 |
31 | 1/2 in. argon spaces | 1.07 | 0.84 | 0.79 | 0.59 | 0.59 | 0.48 | 0.42 |
Triple Glazing, e = 0.20 on surface 2,3,4, or 5 | ||||||||
32 | 1/4 in. airspace | 1.08 | 0.85 | 0.79 | 0.59 | 0.60 | 0.49 | 0.43 |
33 | 1/2 in. airspace | 1.05 | 0.82 | 0.77 | 0.57 | 0.57 | 0.46 | 0.41 |
34 | 1/4 in. argon space | 1.02 | 0.79 | 0.74 | 0.54 | 0.55 | 0.44 | 0.38 |
35 | 1/2 in. argon space | 1.01 | 0.78 | 0.73 | 0.53 | 0.54 | 0.43 | 0.37 |
Triple Glazing, e = 0.20 on surfaces 2 or 3 and 4 or 5 | ||||||||
36 | 1/4 in. airspace | 1.03 | 0.80 | 0.75 | 0.55 | 0.56 | 0.45 | 0.39 |
37 | 1/2 in. airspace | 1.01 | 0.78 | 0.73 | 0.53 | 0.54 | 0.43 | 0.37 |
38 | 1/4 in. argon space | 0.99 | 0.75 | 0.70 | 0.50 | 0.51 | 0.40 | 0.35 |
39 | 1/2 in. argon space | 0.97 | 0.74 | 0.69 | 0.49 | 0.50 | 0.39 | 0.33 |
Triple Glazing, e = 0.10 on surfaces 2 or 3 and 4 or 5 | ||||||||
40 | 1/4 in. airspace | 1.01 | 0.78 | 0.73 | 0.53 | 0.54 | 0.43 | 0.37 |
41 | 1/2 in. airspace | 0.99 | 0.76 | 0.71 | 0.51 | 0.52 | 0.41 | 0.36 |
42 | 1/4 in. argon space | 0.96 | 0.73 | 0.68 | 0.48 | 0.49 | 0.38 | 0.32 |
43 | 1/2 in. argon space | 0.95 | 0.72 | 0.67 | 0.47 | 0.48 | 0.37 | 0.31 |
Quadruple Glazing, e = 0.10 on surfaces 2 or 3 and 4 or 5 | ||||||||
44 | 1/4 in. airspace | 0.97 | 0.74 | 0.69 | 0.49 | 0.50 | 0.39 | 0.33 |
45 | 1/2 in. airspace | 0.94 | 0.71 | 0.66 | 0.46 | 0.47 | 0.36 | 0.30 |
46 | 1/4 in. argon space | 0.93 | 0.70 | 0.65 | 0.45 | 0.46 | 0.35 | 0.30 |
47 | 1/2 in. argon space | 0.91 | 0.68 | 0.63 | 0.43 | 0.44 | 0.33 | 0.28 |
48 | 1/4 in. krypton spaces | 0.88 | 0.65 | 0.60 | 0.40 | 0.42 | 0.31 | 0.25 |
TABLE A8.1-2 Assembly SHGCs and Assembly Visible Transmittances (VTs) for Unlabeled Skylights
Glass Type | Glazing Type: Number of Glazing Layers Number and Emissivity of Coatings (Glazing is Glass Except where Noted) | Unlabeled Skylights (Includes Glass/Plastic, Flat/Domed, Fixed/Operable) | |||||||
---|---|---|---|---|---|---|---|---|---|
Frame: | Metal without Thermal Break | Metal with Thermal Break | Wood/Vinyl/Fiberglass | ||||||
Characteristic: | SHGC | VT | SHGC | VT | SHGC | VT | |||
Clear | Single glazing, 1/8 in. glass | 0.82 | 0.76 | 0.78 | 0.76 | 0.73 | 0.73 | ||
Single glazing, 1/4 in. glass | 0.78 | 0.75 | 0.74 | 0.75 | 0.69 | 0.72 | |||
Single glazing, acrylic/polycarbonate | 0.83 | 0.92 | 0.83 | 0.92 | 0.83 | 0.92 | |||
Double glazing | 0.68 | 0.66 | 0.64 | 0.66 | 0.59 | 0.64 | |||
Double glazing, e = 0.40 on surface 2 or 3 | 0.71 | 0.65 | 0.67 | 0.65 | 0.62 | 0.63 | |||
Double glazing, e = 0.20 on surface 2 or 3 | 0.66 | 0.61 | 0.62 | 0.61 | 0.57 | 0.59 | |||
Double glazing, e = 0.10 on surface 2 or 3 | 0.59 | 0.63 | 0.55 | 0.63 | 0.51 | 0.61 | |||
Double glazing, acrylic/polycarbonate | 0.77 | 0.89 | 0.77 | 0.89 | 0.77 | 0.89 | |||
Triple glazing | 0.60 | 0.59 | 0.56 | 0.59 | 0.52 | 0.57 | |||
Triple glazing, e = 0.40 on surface 2, 3, 4, or 5 | 0.64 | 0.60 | 0.60 | 0.60 | 0.56 | 0.57 | |||
Triple glazing, e = 0.20 on surface 2, 3, 4, or 5 | 0.59 | 0.55 | 0.55 | 0.55 | 0.51 | 0.53 | |||
Triple glazing, e = 0.10 on surface 2, 3, 4, or 5 | 0.54 | 0.56 | 0.50 | 0.56 | 0.46 | 0.54 | |||
Triple glazing, e = 0.40 on surfaces 3 and 5 | 0.62 | 0.57 | 0.58 | 0.57 | 0.53 | 0.55 | |||
Triple glazing, e = 0.20 on surfaces 3 and 5 | 0.56 | 0.51 | 0.52 | 0.51 | 0.48 | 0.49 | |||
Triple glazing, e = 0.10 on surfaces 3 and 5 | 0.47 | 0.54 | 0.43 | 0.54 | 0.40 | 0.52 | |||
Triple glazing, acrylic/polycarbonate | 0.71 | 0.85 | 0.71 | 0.85 | 0.71 | 0.85 | |||
Quadruple glazing, e = 0.10 on surfaces 3 and 5 | 0.41 | 0.48 | 0.37 | 0.48 | 0.33 | 0.46 | |||
Quadruple glazing, acrylic/polycarbonate | 0.65 | 0.81 | 0.65 | 0.81 | 0.65 | 0.81 | |||
Tinted | Single glazing, 1/8 in. glass | 0.70 | 0.58 | 0.66 | 0.58 | 0.62 | 0.56 | ||
Single glazing, 1/4 in. glass | 0.61 | 0.45 | 0.56 | 0.45 | 0.52 | 0.44 | |||
Single glazing, acrylic/polycarbonate | 0.46 | 0.27 | 0.46 | 0.27 | 0.46 | 0.27 | |||
Double glazing | 0.50 | 0.40 | 0.46 | 0.40 | 0.42 | 0.39 | |||
Double glazing, e = 0.40 on surface 2 or 3 | 0.59 | 0.50 | 0.55 | 0.50 | 0.50 | 0.48 | |||
Double glazing, e = 0.20 on surface 2 or 3 | 0.47 | 0.37 | 0.43 | 0.37 | 0.39 | 0.36 | |||
Double glazing, e = 0.10 on surface 2 or 3 | 0.43 | 0.38 | 0.39 | 0.38 | 0.35 | 0.37 | |||
Double glazing, acrylic/polycarbonate | 0.37 | 0.25 | 0.37 | 0.25 | 0.37 | 0.25 | |||
Triple glazing | 0.42 | 0.22 | 0.37 | 0.22 | 0.34 | 0.21 | |||
Triple glazing, e = 0.40 on surface 2, 3, 4, or 5 | 0.53 | 0.45 | 0.49 | 0.45 | 0.45 | 0.44 | |||
Triple glazing, e = 0.20 on surface 2, 3, 4, or 5 | 0.42 | 0.33 | 0.38 | 0.33 | 0.35 | 0.32 | |||
Triple glazing, e = 0.10 on surface 2, 3, 4, or 5 | 0.39 | 0.34 | 0.35 | 0.34 | 0.31 | 0.33 | |||
Triple glazing, e = 0.40 on surfaces 3 and 5 | 0.51 | 0.43 | 0.47 | 0.43 | 0.43 | 0.42 | |||
Triple glazing, e = 0.20 on surfaces 3 and 5 | 0.40 | 0.31 | 0.36 | 0.31 | 0.32 | 0.29 | |||
Triple glazing, e = 0.10 on surfaces 3 and 5 | 0.34 | 0.32 | 0.30 | 0.32 | 0.27 | 0.31 | |||
Triple glazing, acrylic/polycarbonate | 0.30 | 0.23 | 0.30 | 0.23 | 0.30 | 0.23 | |||
Quadruple glazing, e = 0.10 on surfaces 3 and 5 | 0.30 | 0.29 | 0.26 | 0.29 | 0.23 | 0.28 | |||
Quadruple glazing, acrylic/polycarbonate | 0.27 | 0.25 | 0.27 | 0.25 | 0.27 | 0.25 |
TABLE A8.2 Assembly U-Factors, Assembly SHGCs, and Assembly Visible Transmittances (VTs) for Unlabeled Vertical Fenestration
Frame Type | Glazing Type | Unlabeled Vertical Fenestration | |||||
---|---|---|---|---|---|---|---|
Clear Glass | Tinted Glass | ||||||
U-Factor | SHGC | VT | U-Factor | SHGC | VT | ||
All frame types | Single glazing | 1.25 | 0.82 | 0.76 | 1.25 | 0.70 | 0.58 |
Glass block | 0.60 | 0.56 | 0.56 | NA | NA | NA | |
Wood, vinyl, or fiberglass frames | Double glazing | 0.60 | 0.59 | 0.64 | 0.60 | 0.42 | 0.39 |
Triple glazing | 0.45 | 0.52 | 0.57 | 0.45 | 0.34 | 0.21 | |
Metal and other frame types | Double glazing | 0.90 | 0.68 | 0.66 | 0.90 | 0.50 | 0.40 |
Triple glazing | 0.70 | 0.60 | 0.59 | 0.70 | 0.42 | 0.22 |
- Roofs
- Roofs with insulation entirely above deck: testing or series calculation method.
- Metal building roofs: testing, or for single-layer and double-layer systems, calculation method in Section A9.4.5.
- Attic roofs, wood joists: testing or parallel path calculation method.
- Attic roofs, steel joists: testing or parallel path calculation method using the insulation/framing layer adjustment factors in Table A9.2-1 or modified zone calculation method.
- Attic roofs, concrete joists: testing or parallel path calculation method if concrete is solid and uniform or isothermal planes calculation method if concrete has hollow sections.
- Other attic roofs and other roofs: testing or two-dimensional calculation method.
- Above-Grade Walls
- Mass walls: testing or isothermal planes calculation method or two-dimensional calculation method. The parallel path calculation method is not acceptable.
- Metal building walls: testing, or for single-layer and double-layer systems, calculation method in Section A9.4.5.
- Steel-framed walls: testing or parallel path calculation method using the insulation/framing layer adjustment factors in Table A9.2-2 or the modified zone method.
- Wood-framed walls: testing or parallel path calculation method.
- Other walls: testing or two-dimensional calculation method.
- Below-Grade Walls
- Mass walls: testing or isothermal planes calculation method or two-dimensional calculation method. The parallel path calculation method is not acceptable.
- Other walls: testing or two-dimensional calculation method
- Floors
- Mass floors: testing or parallel path calculation method if concrete is solid and uniform or isothermal planes calculation method if concrete has hollow sections.
- Steel joist floors: testing or modified zone calculation method.
- Wood joist floors: testing or parallel path calculation method or isothermal planes calculation method.
- Other floors: testing or two-dimensional calculation method.
- Slab-on-Grade Floors
No testing or calculations allowed.
TABLE A9.2-1 Effective Insulation/Framing Layer R-Values for Roof and Floor Insulation Installed Between Metal Framing (4 ft on Center)
Rated R-Value of Insulation | Correction Factor | Framing/Cavity R-Value | Rated R-Value of Insulation | Correction Factor | Framing/Cavity R-Value |
---|---|---|---|---|---|
0.00 | 1.00 | 0.00 | 20.00 | 0.85 | 17.00 |
4.00 | 0.97 | 3.88 | 21.00 | 0.84 | 17.64 |
5.00 | 0.96 | 4.80 | 24.00 | 0.82 | 19.68 |
8.00 | 0.94 | 7.52 | 25.00 | 0.81 | 20.25 |
10.00 | 0.92 | 9.20 | 30.00 | 0.79 | 23.70 |
11.00 | 0.91 | 10.01 | 35.00 | 0.76 | 26.60 |
12.00 | 0.90 | 10.80 | 38.00 | 0.74 | 28.12 |
13.00 | 0.90 | 11.70 | 40.00 | 0.73 | 29.20 |
15.00 | 0.88 | 13.20 | 45.00 | 0.71 | 31.95 |
16.00 | 0.87 | 13.92 | 50.00 | 0.69 | 34.50 |
19.00 | 0.86 | 16.34 | 55.00 | 0.67 | 36.85 |
TABLE A9.2-2 Effective Insulation/Framing Layer R-Values for Wall Insulation Installed Between Steel Framing
Nominal Depth of Cavity, in. | Actual Depth of Cavity, in. | Rated R-Value of Airspace or Insulation | Effective Framing/Cavity R-Value at 16 in. on Center | Effective Framing/Cavity R-Value at 24 in. on Center |
---|---|---|---|---|
Empty Cavity, No Insulation | ||||
4 | 3.5 | R-0.91 | 0.79 | 0.91 |
Insulated Cavity | ||||
4 | 3.5 | R-11 | 5.5 | 6.6 |
4 | 3.5 | R-13 | 6.0 | 7.2 |
4 | 3.5 | R-15 | 6.4 | 7.8 |
6 | 6.0 | R-19 | 7.1 | 8.6 |
6 | 6.0 | R-21 | 7.4 | 9.0 |
8 | 8.0 | R-25 | 7.8 | 9.6 |
- ASTM C177
- ASTM C518
- ASTM C1363
Product samples tested shall be production line material or representative of material as purchased by the consumer or contractor. If the assembly is too large to be tested at one time in its entirety, then either a representative portion shall be tested or different portions shall be tested separately and a weighted average determined. To be representative, the portion tested shall include edges of panels, joints with other panels, typical framing percentages, and thermal bridges.
TABLE A9.4.1.4-1 Values for Cavity Air Spaces
Component | Airspace Thickness, in. | R-Value Effective Emissivity | ||||
---|---|---|---|---|---|---|
0.03 | 0.05 | 0.20 | 0.50 | 0.82 | ||
Roof | 0.50 | 2.13 | 2.04 | 1.54 | 1.04 | 0.77 |
0.75 | 2.33 | 2.22 | 1.64 | 1.09 | 0.80 | |
1.50 | 2.53 | 2.41 | 1.75 | 1.13 | 0.82 | |
3.50 | 2.83 | 2.66 | 1.88 | 1.19 | 0.85 | |
Wall | 0.50 | 2.54 | 2.43 | 1.75 | 1.13 | 0.82 |
0.75 | 3.58 | 3.32 | 2.18 | 1.30 | 0.90 | |
1.50 | 3.92 | 3.62 | 2.30 | 1.34 | 0.93 | |
3.50 | 3.67 | 3.40 | 2.21 | 1.31 | 0.91 | |
Floor | 0.50 | 2.55 | 1.28 | 1.00 | 0.69 | 0.53 |
0.75 | 1.44 | 1.38 | 1.06 | 0.73 | 0.54 | |
1.50 | 2.49 | 2.38 | 1.76 | 1.15 | 0.85 | |
3.50 | 3.08 | 2.90 | 2.01 | 1.26 | 0.90 |
TABLE A9.4.1.4-2 Emittance Values of Various Surfaces and Effective Emittances of Air Spaces
Surface | Average Emissivity e | Effective Emissivity | |
---|---|---|---|
Effective Emissivity of Air Space | |||
One Surface e; Other, 0.9 | Both Surfaces Emissivity e | ||
Aluminum foil, bright | 0.05 | 0.05 | 0.03 |
Aluminum foil, with condensate just visible (>0.7 gr/ft^{2}) | 0.30 | 0.29 | — |
Aluminum foil, with condensate clearly visible (>2.9 gr/ft^{2}) | 0.70 | 0.65 | — |
Aluminum sheet | 0.12 | 0.12 | 0.06 |
Aluminum coated paper, polished | 0.20 | 0.20 | 0.11 |
Steel, galv., bright | 0.25 | 0.24 | 0.15 |
Aluminum paint | 0.50 | 0.47 | 0.35 |
Building materials: wood, paper, masonry, nonmetallic paints | 0.90 | 0.82 | 0.82 |
Regular glass | 0.84 | 0.77 | 0.72 |
- For insulation that is not compressed, the rated R-value of insulation shall be used.
- For calculation purposes, the effective R-value for insulation that is uniformly compressed in confined cavities shall be taken from Table A9.4.2.
- For calculation purposes, the effective R-value for insulation installed in cavities in attic roofs with steel joists shall be taken from Table A9.2-1.
- For calculation purposes, the effective R-value for insulation installed in cavities in steel-framed walls shall be taken from Table A9.2-2.
TABLE A9.4.2 Effective R-Values for Fiberglass
Insulation R-Value at Standard Thickness | |||||||||
---|---|---|---|---|---|---|---|---|---|
Rated R-Value | 38 | 30 | 22 | 21 | 19 | 15 | 13 | 11 | |
Standard Thickness, in. | 12 | 9.5 | 6.5 | 5.5 | 6 | 3.5 | 3.5 | 3.5 | |
Nominal Lumber Size, in. | Actual Depth of Cavity, in. | Effective Insulation R-Values when Installed in a Confined Cavity | |||||||
2 × 12 | 11.25 | 37 | — | — | — | — | — | — | — |
2 × 10 | 9.25 | 32 | 30 | — | — | — | — | — | — |
2 × 8 | 7.25 | 27 | 26 | 22 | 21 | 19 | — | — | — |
2 × 6 | 5.5 | — | 21 | 20 | 21 | 18 | — | — | — |
2 × 4 | 3.5 | — | — | 14 | — | 13 | 15 | 13 | 11 |
2.5 | — | — | — | — | — | — | 9.8 | — | |
1.5 | — | — | — | — | — | — | 6.3 | 6 |
Exception: R-values for building materials or thermal conductivities determined from testing in accordance with Section A9.3.
TABLE A9.4.3-1 R-Values for Building Materials
Material | Nominal Size, in. | Actual Size, in. | R-Value |
---|---|---|---|
Carpet and rubber pad | — | — | 1.23 |
Concrete at R-0.0625/in. | — | 2 | 0.13 |
— | 4 | 0.25 | |
— | 6 | 0.38 | |
— | 8 | 0.5 | |
— | 10 | 0.63 | |
— | 12 | 0.75 | |
Flooring, wood subfloor | — | 0.75 | 0.94 |
Gypsum board | — | 0.5 | 0.45 |
— | 0.625 | 0.56 | |
Metal deck | — | — | 0 |
Roofing, built-up | — | 0.375 | 0.33 |
Sheathing, vegetable fiber board, 0.78 in. | — | 0.78 | 2.06 |
Soil at R-0.104/in. | — | 12 | 1.25 |
Steel, mild | 1 | 0.0031807 | |
Stucco | — | 0.75 | 0.08 |
Wood, 2 × 4 at R-1.25/in. | 4 | 3.5 | 4.38 |
Wood, 2 × 4 at R-1.25/in. | 6 | 5.5 | 6.88 |
Wood, 2 × 4 at R-1.25/in. | 8 | 7.25 | 9.06 |
Wood, 2 × 4 at R-1.25/in. | 10 | 9.25 | 11.56 |
Wood, 2 × 4 at R-1.25/in. | 12 | 11.25 | 14.06 |
Wood, 2 × 4 at R-1.25/in. | 14 | 13.25 | 16.56 |
TABLE A9.4.3-2 Thermal Conductivity of Concrete Block Material
Concrete Block Density, lb/ft^{3} | Thermal Conductivity, Btu•in./h•ft^{2}•°F |
---|---|
80 | 3.7 |
85 | 4.2 |
90 | 4.7 |
95 | 5.1 |
100 | 5.5 |
105 | 6.1 |
110 | 6.7 |
115 | 7.2 |
120 | 7.8 |
125 | 8.9 |
130 | 10.0 |
135 | 11.8 |
140 | 13.5 |
There are six steps in the calculation process:
Step 1—Characterize the thermal conductivity of the fiberglass,
Step 2—Determine the U-factor for the insulation in the cavity,
Step 3—Determine the U-factor over the structural framing member,
Step 4—Area weight the U-factors calculated in steps 2 and 3,
Step 5—Determine the U-factor from the finite element analysis results,
Step 6—Determine the U-factor for any continuous insulation if present.
Step 1—The thermal conductivity of the fiberglass batt insulation is represented by a thermal curve of the form in Equation A9.4-1:
(A9.4-1) |
where
k | = | thermal conductivity, Btu/h•ft•°F |
ρ | = | density, lb/ft^{3} |
A | = | 0.014917 |
B | = | 0.0004377 |
C | = | 0.0056897 |
Step 2—Assume the fiberglass batt forms a parabolic profile defined by Equation A9.4-2:
(A9.4-2) |
Determine the cavity U-factor (U_{c}) using Equation A9.4-3:
(A9.4-3) |
where
ρ_{o} | = | reference density of the fiberglass, lb/ft^{3} |
t_{o} | = | reference thickness of the fiberglass, ft |
The properties of fiberglass insulation are presented in Table A9.4.5.1.
TABLE A9.4.5.1 Fiberglass Reference Properties
R-Value, h•ft^{2}•°F/Btu | Weight, lb/ft^{2} | Density, lb/ft^{3} | Thickness, ft |
---|---|---|---|
10 | 0.149 | 0.605 | 0.2458 |
11 | 0.168 | 0.630 | 0.2667 |
13 | 0.199 | 0.628 | 0.3167 |
16 | 0.243 | 0.634 | 0.3833 |
19 | 0.297 | 0.653 | 0.4542 |
25 | 0.427 | 0.742 | 0.5750 |
30 | 0.520 | 0.766 | 0.6792 |
Include the thermal resistances of the interior (R_{i}) and exterior (R_{e}) air films to calculate the overall cavity U-factor (U_{co}) using Equation A9.4-4.
(A9.4-4) |
Step 3—Determine the U-factor (U_{fo}) over the structural framing member. The variable Y_{o} represents the total combined thickness of the thermal spacer block and the compressed insulation. The density of the compressed insulation is determined by Equation A9.4-5:
(A9.4-5) |
where
ρ_{c} | = | density of the compressed insulation over the framing member, lb/ft^{3} |
t_{c} | = | thickness of the compressed insulation over the framing member, ft |
Determine the thermal resistance of the compressed insulation (R_{c}) using Equation A9.4-6:
FIGURE A9.4.5.1 Geometry of single-layer fiberglass batt.
where
X | = | distance from edge of purlin or girt, ft |
Y | = | distance from edge of roof panel or wall panel, ft L = length from edge of purlin or girt to centerline of cavity, ft |
w_{f} | = | width of purlin or girt flange, ft |
Y_{o} | = | distance between purlin or girt and the roof panel or wall panel, ft |
Y_{m} | = | distance from edge of roof panel or wall panel at the cavity centerline, ft |
(A9.4-6) |
Determine the overall framing U-factor (U_{fo}) at the structural framing member, including the air film resistances, using Equation A9.4-7:
(A9.4-7) |
where
U_{fo} | = | U-factor over the structural framing member, Btu/h•ft^{2}•°F |
R_{TB} | = | R-value of the thermal spacer block, h•ft^{2}•°F/Btu |
R_{c} | = | R-value of the compressed insulation, h•ft^{2}•°F/Btu |
Step 4—Determine the overall area weighted U-factor for the entire system using Equation A9.4-8:
(A9.4-8) |
where
U_{es} | = | area weighted U-factor for the entire system, Btu/h•ft^{2}•°F |
w_{f} | = | width of purlin or girt flange, ft |
Step 5—Calculate the adjusted overall U-factor (U_{adj}) using Equation A9.4-9:
(A9.4-9) |
where
U_{adj} | = | adjusted overall U-factor represented by correlation with the finite element modeling, Btu/h•ft^{2}•°F |
Step 6—If there is any continuous insulation present, calculate the overall U-factor using Equation A9.4-10:
(A9.4-10) |
There are six steps in the calculation process:
Step 1—Characterize the thermal conductivity of the fiberglass,
Step 2—Determine the U-factor for the insulation in the cavity,
Step 3—Determine the U-factor over the structural framing member,
Step 4—Area weight the U-factors calculated in steps 2 and 3,
Step 5—Determine the U-factor from the finite element analysis results,
Step 6—Determine the U-factor for any continuous insulation if present.
Step 1—The thermal conductivity of the fiberglass batt insulation is represented by a thermal curve of the form in Equation A9.4-11:
(A9.4-11) |
where
k | = | thermal conductivity, Btu/h•ft^{2}•°F |
ρ | = | density, lb/ft^{3} |
A | = | 0.014917 |
B | = | 0.0004377 |
C | = | 0.0056897 |
Step 2—Assume the double-layer fiberglass batt forms a parabolic profile defined by Equation A9.4-12:
(A9.4-12) |
The presence of two layers of fiberglass adds complexity because each layer has distinct reference properties—see Table A9.4.5.1. As the double layers are compressed, the thickness of each layer needs to be determined by considering that each layer achieves the same compressive force. Instead of having a closed-form analytical solution that predicts the U-factor for the cavity, the double-layer system requires that the parabolic profile be numerically integrated. The compression of the double-layer system is presented in Figure A9.4.5.2-2.
The thickness of the second layer (Y_{2}) is described by Equation A9.4-13:
FIGURE A9.4.5.2-1 Geometry of double layers of fiber-glass batts.
where
X | = | distance from edge of purlin or girt, ft |
Y | = | distance from edge of roof panel or wall panel, ft |
L | = | length from edge of purlin or girt to centerline of cavity, ft |
w_{f} | = | width of purlin or girt flange, ft |
Y_{o} | = | distance between purlin or girt and the roof panel or wall panel, ft |
Y_{m} | = | distance from edge of roof panel or wall panel at the cavity centerline, ft |
FIGURE A9.4.5.2-2 Compression of double layers of fiberglass insulation.
(A9.4-13) |
where
Y_{c} | = | compressed thickness of the double layers, ft |
ρ_{o}_{1} | = | reference density of first layer, lb/ft^{3} |
ρ_{o}_{2} | = | reference density of second layer, lb/ft^{3} |
W_{1} | = | reference weight of first layer, lb/ft^{2} |
W_{2} | = | reference weight of second layer, lb/ft^{2} |
The solutions to Equation A9.4-13 are Equation A9.4-14a and A9.4-14b:
(A9.4-14a) |
(A9.4-14b) |
where
a | = | 1 |
b | = |
c | = |
Select the smaller value of Y_{2,}_{a} and Y_{2,}_{b} as Y_{2}. Y_{1} shall be calculated as the difference between Y_{c} and Y_{2}. Next, the R-values for the two compressed layers of insulation shall be calculated and converted to a U-factor. This process shall be repeated along the entire profile and the results numerically integrated using maximum 0.04167 ft increments.
It is important to note that Equation A9.4-13 does not apply when the two layers of insulation are the same material. In this case, each compressed layer has the same thickness, which simplifies the U-factor calculations. The numerical integration still needs to be completed to determine the U_{co}.
Step 3—Determine the U-factor over the structural framing member. The variable (Y_{o}) represents the thickness of the thermal spacer block and the thickness of the compressed insulation. The density of the compressed insulation is determined by Equation A9.4-15:
(A9.4-15) |
where
ρ_{c} | = | density of the compressed insulation over the framing member, lb/ft^{3} |
t_{c} | = | thickness of the compressed insulation over the framing member, ft |
The thermal resistance of the compressed insulation is determined by Equation A9.4-16:
(A9.4-16) |
Determine the overall framing U-factor (U_{fo}) at the structural framing member including the air film resistances using Equation A9.4-17:
(A9.4-17) |
where
U_{fo} | = | U-factor over the structural framing member, Btu/h•ft^{2}•°F |
R_{TB} | = | R-value of the thermal spacer block, h•ft^{2}•°F/Btu |
R_{c} | = | R-value of the compressed insulation, h•ft^{2}•°F/Btu |
Step 4—Determine the overall area weighted U-factor for the entire system using Equation A9.4-18:
(A9.4-18) |
where
U_{es} | = | area weighted U-factor for the entire system, Btu/h•ft^{2}•°F |
Step 5—Calculate the adjusted overall U-factor (U_{adj}) using Equation A9.4-19:
(A9.4-19) |
where
U_{adj} | = | adjusted overall U-factor represented by correlation with the finite element modeling, Btu/h•ft^{2}•°F |
Step 6—If there is any continuous insulation presnt, calculate the overall U-factor using Equation A9.4-20:
(A9.4-20) |