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 AloneOverall U-Factor for Entire Assembly
R-0U-1.282
R-1U-0.562
R-2U-0.360
R-3U-0.265
R-4U-0.209
R-5U-0.173
R-6U-0.147
R-7U-0.129
R-8U-0.114
R-9U-0.102
R-10U-0.093
R-11U-0.085
R-12U-0.078
R-13U-0.073
R-14U-0.068
R-15U-0.063
R-16U-0.060
R-17U-0.056
R-18U-0.053
R-19U-0.051
R-20U-0.048
R-21U-0.046
R-22U-0.044
R-23U-0.042
R-24U-0.040
R-25U-0.039
R-26U-0.037
R-27U-0.036
R-28U-0.035
R-29U-0.034
R-30U-0.032
R-35U-0.028
R-40U-0.025
R-45U-0.022
R-50U-0.020
R-55U-0.018
R-60U-0.016

ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 231