ASHRAE-90.1-2022- - Page 234

Extracted Content

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)	Col5	Col6	Col7	Col8	Col9	Col10	Col11	Col12
Insulation System	Rated R-Value of Insulation	Overall U-Factor for Entire Base Roof Assembly	Rated R-Value of Continuous Insulation	Rated R-Value of Continuous Insulation	Rated R-Value of Continuous Insulation	Rated R-Value of Continuous Insulation	Rated R-Value of Continuous Insulation	Rated R-Value of Continuous Insulation	Rated R-Value of Continuous Insulation	Rated R-Value of Continuous Insulation	Rated R-Value of Continuous Insulation
Insulation System	Rated R-Value of Insulation	Overall U-Factor for Entire Base Roof Assembly	R-6.5	R-9.8	R-13	R-15.8	R-19	R-22.1	R-25	R-32	R-38

Single layer	None	1.280	0.137	0.095	0.073	0.060	0.051	0.044	0.039	0.031	0.026
Single layer	R-10	0.115	0.066	0.054	0.046	0.041	0.036	0.032	0.030	0.025	0.021
Single layer	R-11	0.107	0.063	0.052	0.045	0.040	0.035	0.032	0.029	0.024	0.021
Single layer	R-13	0.101	0.061	0.051	0.044	0.039	0.035	0.031	0.029	0.024	0.021
Single layer	R-16	0.096	0.059	0.049	0.043	0.038	0.034	0.031	0.028	0.024	0.021
Single layer	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
Double layer	R-10 + R-11	0.086	0.055	0.047	0.041	0.036	0.033	0.030	0.027	0.023	0.020
Double layer	R-11 + R-11	0.085	0.055	0.046	0.040	0.036	0.033	0.030	0.027	0.023	0.020
Double layer	R-10 + R-13	0.084	0.054	0.046	0.040	0.036	0.032	0.029	0.027	0.023	0.020
Double layer	R-11 + R-13	0.082	0.053	0.045	0.040	0.036	0.032	0.029	0.027	0.023	0.020
Double layer	R-13 + R-13	0.075	0.050	0.043	0.038	0.034	0.031	0.028	0.026	0.022	0.019
Double layer	R-10 + R-19	0.074	0.050	0.043	0.038	0.034	0.031	0.028	0.026	0.022	0.019
Double layer	R-11 + R-19	0.072	0.049	0.042	0.037	0.034	0.030	0.028	0.026	0.022	0.019
Double layer	R-13 + R-19	0.068	0.047	0.041	0.036	0.033	0.030	0.027	0.025	0.021	0.019
Double layer	R-16 + R-19	0.065	0.046	0.040	0.035	0.032	0.029	0.027	0.025	0.021	0.019
Double layer	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
Liner system	R-25 + R-8	0.037	0.037	0.037	0.037	0.037	0.037	0.037	0.037	0.037	0.037
Liner system	R-25 + R-11	0.031	0.031	0.031	0.031	0.031	0.031	0.031	0.031	0.031	0.031
Liner system	R-30 + R-11	0.029	0.029	0.029	0.029	0.029	0.029	0.029	0.029	0.029	0.029
Liner system	R-25 + R-11 + R-11	0.026	0.026	0.026	0.026	0.026	0.026	0.026	0.026	0.026	0.026

Filled Cavity with Thermal Spacer Blocks [c]

Col1	R-10 + R-19	0.041	0.032	0.029	0.027	0.025	0.023	0.022	0.020	0.018	0.016
	R-19 + R-11	0.037

Standing Seam Roofs without Thermal Spacer Blocks

Liner system R-19 + R-11 0.040

Through-Fastened Roofs without Thermal Spacer Blocks

Col1	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)

a. A standing seam roof clip that provides a minimum 1.5 in. distance between the top of the purlins and the underside of the metal roof panels is required. b. A minimum R-3 thermal spacer block is required. c. A minimum R-5 thermal spacer block is required.

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