ASHRAE-90.1-2022- - Page 250

Extracted Content

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)	Col5	Col6	Col7	Col8	Col9	Col10	Col11	Col12
Insulation System	Rated R-Value of Insulation	Overall U-Factor for Entire Base Wall Assembly	R-6.5	R-9.8	R-13	R-15.8	R-19	R-22.1	R-25	R-32	R-38
Continuous insulation only	R-0	1.180	0.136	0.094	0.072	0.060	0.050	0.044	0.039	0.030	0.026
Single compressed layer	R-10	0.186	0.084	0.066	0.054	0.047	0.041	0.036	0.033	0.027	0.023
Single compressed layer	R-11	0.185	0.084	0.066	0.054	0.047	0.041	0.036	0.033	0.027	0.023
Single compressed layer	R-13	0.162	0.079	0.063	0.052	0.046	0.040	0.035	0.032	0.026	0.023
Single compressed layer	R-16	0.155	0.077	0.062	0.051	0.045	0.039	0.035	0.032	0.026	0.022
Single compressed layer	R-19	0.147	0.075	0.060	0.050	0.044	0.039	0.035	0.031	0.026	0.022
Single layer in cavity	R-25a	0.059	0.044	0.039	0.035	0.032	0.029	0.027	0.025	0.021	0.019
Single layer in cavity	R-30b	0.052	0.042	0.037	0.033	0.031	0.028	0.026	0.024	0.021	0.019
Double layer	R-25 + R-10	0.047	0.038	0.034	0.031	0.028	0.026	0.024	0.023	0.020	0.018
Double layer	R-25 + R-16	0.042	0.036	0.032	0.029	0.027	0.025	0.023	0.022	0.019	0.018
Double layer	R-25 + R-10c	0.039	0.032	0.029	0.027	0.025	0.023	0.022	0.021	0.018	0.017
Double layer	R-30 + R-16	0.039	0.036	0.032	0.029	0.027	0.025	0.023	0.022	0.019	0.017

(Multiple R-values are listed in order from inside to outside.) a. A minimum R-0.375 thermal spacer block or thermal break strip is required when installed without continuous insulation . b. A minimum R-0.75 thermal spacer block or thermal break strip is required when installed without continuous insulation . c. A minimum R-3 thermal spacer block is required.

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