ASHRAE-90.1-2022- - Page 244

Extracted Content

Table A3.1-2 Assembly U-Factors, C-Factors, Ru , Rc , and HC for Concrete

Density, lb/ft3	Properties	Thickness, in.	Col4	Col5	Col6	Col7	Col8	Col9	Col10	Col11	Col12
Density, lb/ft3	Properties	3	4	5	6	7	8	9	10	11	12
20	U-factor	0.22	0.17	0.14	0.12	0.10	0.09	0.08	0.07	0.07	0.06
20	C-factor	0.27	0.20	0.16	0.13	0.11	0.10	0.09	0.08	0.07	0.07
20	Ru	4.60	5.85	7.10	8.35	9.60	10.85	12.10	13.35	14.60	15.85
20	Rc	3.75	5.00	6.25	7.50	8.75	10.00	11.25	12.50	13.75	15.00
20	HC	1.0	1.3	1.7	2.0	2.3	2.7	3.0	3.3	3.7	4.0
30	U-factor	0.28	0.22	0.19	0.16	0.14	0.12	0.11	0.10	0.09	0.09
30	C-factor	0.37	0.28	0.22	0.18	0.16	0.14	0.12	0.11	0.10	0.09
30	Ru	3.58	4.49	5.40	6.30	7.21	8.12	9.03	9.94	10.85	11.76
30	Rc	2.73	3.64	4.55	5.45	6.36	7.27	8.18	9.09	10.00	10.91
30	HC	1.5	2.0	2.5	3.0	3.5	4.0	4.5	5.0	5.5	6.0
40	U-factor	0.33	0.27	0.23	0.19	0.17	0.15	0.14	0.13	0.11	0.11
40	C-factor	0.47	0.35	0.28	0.23	0.20	0.18	0.16	0.14	0.13	0.12
40	Ru	2.99	3.71	4.42	5.14	5.85	6.56	7.28	7.99	8.71	9.42
40	Rc	2.14	2.86	3.57	4.29	5.00	5.71	6.43	7.14	7.86	8.57
40	HC	2.0	2.7	3.3	4.0	4.7	5.3	6.0	6.7	7.3	8.0
50	U-factor	0.38	0.31	0.26	0.23	0.20	0.18	0.16	0.15	0.14	0.13
50	C-factor	0.57	0.43	0.34	0.28	0.24	0.21	0.19	0.17	0.15	0.14
50	Ru	2.61	3.20	3.79	4.38	4.97	5.56	6.14	6.73	7.32	7.91
50	Rc	1.76	2.35	2.94	3.53	4.12	4.71	5.29	5.88	6.47	7.06
50	HC	2.5	3.3	4.2	5.0	5.8	6.7	7.5	8.3	9.2	10.0
85	U-factor	0.65	0.56	0.50	0.44	0.40	0.37	0.34	0.31	0.29	0.27
85	C-factor	1.43	1.08	0.86	0.71	0.61	0.54	0.48	0.43	0.39	0.36
85	Ru	1.55	1.78	2.01	2.25	2.48	2.71	2.94	3.18	3.41	3.64
85	Rc	0.70	0.93	1.16	1.40	1.63	1.86	2.09	2.33	2.56	2.79
85	HC	4.3	5.7	7.1	8.5	9.9	11.3	12.8	14.2	15.6	17.0
95	U-factor	0.72	0.64	0.57	0.52	0.48	0.44	0.41	0.38	0.36	0.33
95	C-factor	1.85	1.41	1.12	0.93	0.80	0.70	0.62	0.56	0.51	0.47
95	Ru	1.39	1.56	1.74	1.92	2.10	2.28	2.46	2.64	2.81	2.99
95	Rc	0.54	0.71	0.89	1.07	1.25	1.43	1.61	1.79	1.96	2.14
95	HC	4.8	6.3	7.9	9.5	11.1	12.7	14.3	15.8	17.4	19.0
105	U-factor	0.79	0.71	0.65	0.59	0.54	0.51	0.47	0.44	0.42	0.39
105	C-factor	2.38	1.79	1.43	1.18	1.01	0.88	0.79	0.71	0.65	0.59
105	Ru	1.27	1.41	1.56	1.70	1.84	1.98	2.12	2.26	2.40	2.54
105	Rc	0.42	0.56	0.70	0.85	0.99	1.13	1.27	1.41	1.55	1.69
105	HC	5.3	7.0	8.8	10.5	12.3	14.0	15.8	17.5	19.3	21.0
The_U-factors_ and_Ru_ include standard air film resistances. The_C-factors_ and_Rc_ are for the same assembly without air film resistances. Note that the following assemblies do not qualify as a_mass wall_ or_mass floor_: 3 in. thick concrete with densities of 85, 95, 125, and 135 lb/ft3.	The_U-factors_ and_Ru_ include standard air film resistances. The_C-factors_ and_Rc_ are for the same assembly without air film resistances. Note that the following assemblies do not qualify as a_mass wall_ or_mass floor_: 3 in. thick concrete with densities of 85, 95, 125, and 135 lb/ft3.	The_U-factors_ and_Ru_ include standard air film resistances. The_C-factors_ and_Rc_ are for the same assembly without air film resistances. Note that the following assemblies do not qualify as a_mass wall_ or_mass floor_: 3 in. thick concrete with densities of 85, 95, 125, and 135 lb/ft3.	The_U-factors_ and_Ru_ include standard air film resistances. The_C-factors_ and_Rc_ are for the same assembly without air film resistances. Note that the following assemblies do not qualify as a_mass wall_ or_mass floor_: 3 in. thick concrete with densities of 85, 95, 125, and 135 lb/ft3.	The_U-factors_ and_Ru_ include standard air film resistances. The_C-factors_ and_Rc_ are for the same assembly without air film resistances. Note that the following assemblies do not qualify as a_mass wall_ or_mass floor_: 3 in. thick concrete with densities of 85, 95, 125, and 135 lb/ft3.	The_U-factors_ and_Ru_ include standard air film resistances. The_C-factors_ and_Rc_ are for the same assembly without air film resistances. Note that the following assemblies do not qualify as a_mass wall_ or_mass floor_: 3 in. thick concrete with densities of 85, 95, 125, and 135 lb/ft3.	The_U-factors_ and_Ru_ include standard air film resistances. The_C-factors_ and_Rc_ are for the same assembly without air film resistances. Note that the following assemblies do not qualify as a_mass wall_ or_mass floor_: 3 in. thick concrete with densities of 85, 95, 125, and 135 lb/ft3.	The_U-factors_ and_Ru_ include standard air film resistances. The_C-factors_ and_Rc_ are for the same assembly without air film resistances. Note that the following assemblies do not qualify as a_mass wall_ or_mass floor_: 3 in. thick concrete with densities of 85, 95, 125, and 135 lb/ft3.	The_U-factors_ and_Ru_ include standard air film resistances. The_C-factors_ and_Rc_ are for the same assembly without air film resistances. Note that the following assemblies do not qualify as a_mass wall_ or_mass floor_: 3 in. thick concrete with densities of 85, 95, 125, and 135 lb/ft3.	The_U-factors_ and_Ru_ include standard air film resistances. The_C-factors_ and_Rc_ are for the same assembly without air film resistances. Note that the following assemblies do not qualify as a_mass wall_ or_mass floor_: 3 in. thick concrete with densities of 85, 95, 125, and 135 lb/ft3.	The_U-factors_ and_Ru_ include standard air film resistances. The_C-factors_ and_Rc_ are for the same assembly without air film resistances. Note that the following assemblies do not qualify as a_mass wall_ or_mass floor_: 3 in. thick concrete with densities of 85, 95, 125, and 135 lb/ft3.	The_U-factors_ and_Ru_ include standard air film resistances. The_C-factors_ and_Rc_ are for the same assembly without air film resistances. Note that the following assemblies do not qualify as a_mass wall_ or_mass floor_: 3 in. thick concrete with densities of 85, 95, 125, and 135 lb/ft3.

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