ASHRAE-90.1-2022- - Page 233
Extracted Content
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 |
ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 231