ASHRAE-90.1-2022- - Page 260

Extracted Content

Table A6.3.1-1 Assembly F-Factors for Slab-on-Grade Floors

Col1	Col2	Unheated Slabs	Col4	Col5	Col6	Col7	Col8	Col9	Col10	Col11	Col12	Col13	Col14
Uninsulated: 0.73
12 in. horizontal		0.72	0.71	0.71	0.71
24 in. horizontal	24 in. horizontal	0.70	0.70	0.70	0.69	0.69	0.69	0.69	0.69	0.69	0.69	0.69	0.69
36 in. horizontal	36 in. horizontal	0.68	0.67	0.66	0.66	0.66	0.66	0.66	0.66	0.66	0.66	0.66	0.66
48 in. horizontal	48 in. horizontal	0.67	0.65	0.64	0.63	0.63	0.63	0.63	0.63	0.63	0.63	0.63	0.63
12 in. vertical		0.61	0.60	0.58	0.57	0.567	0.565	0.564
24 in. vertical	24 in. vertical	0.58	0.56	0.54	0.52	0.510	0.505	0.502	0.502	0.502	0.502	0.502	0.502
36 in. vertical	36 in. vertical	0.56	0.53	0.51	0.48	0.472	0.464	0.460	0.460	0.460	0.460	0.460	0.460
48 in. vertical	48 in. vertical	0.54	0.51	0.48	0.45	0.434	0.424	0.419	0.419	0.419	0.419	0.419	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

Uninsulated: 1.35	Col2	Col3	Col4	Col5	Col6	Col7	Col8	Col9	Col10	Col11	Col12	Col13	Col14
12 in. horizontal		1.31	1.31	1.30	1.30
24 in. horizontal	24 in. horizontal	1.28	1.27	1.26	1.25
36 in. horizontal	36 in. horizontal	1.24	1.21	1.20	1.18
48 in. horizontal	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	24 in. vertical	0.99	0.95	0.90	0.86	0.843	0.832	0.827
36 in. vertical	36 in. vertical	0.95	0.89	0.84	0.79	0.762	0.747	0.740
48 in. vertical	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
Underslab insulation only	1.06	1.01	0.95	0.90	0.82	0.76

Table A6.3.1-2 Assembly F-Factors for Fully Insulated Heated Slab-on-Grade Floors

Insulation Description	Rated R-Value of Edge Insulation	Col3	Col4	Col5	Col6	Col7	Col8	Col9
Insulation Description	R-3.5	R-5	R-7.5	R-10	R-15	R-20	R-25	R-30

Heated Slabs

R-3.5 under slab	0.81	0.78	0.74	0.71	0.69	0.671	0.670	0.669
R-5 under slab	0.77	0.74	0.69	0.66	0.62	0.602	0.602	0.601
R-7.5 under slab	0.71	0.67	0.64	0.60	0.58	0.566	0.564	0.563
R-10 under slab	0.66	0.62	0.58	0.55	0.51	0.496	0.494	0.493
R-15 under slab	0.57	0.54	0.50	0.47	0.45	0.433	0.432	0.431
R-20 under slab	0.51	0.48	0.44	0.41	0.39	0.371	0.370	0.369

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