Related Resources: heat transfer

Thermal Resistance of Floor Coverings

Heat Transfer Engineering
HVAC Systems Engineering
Civil Engineering

Thermal Resistance of Floor Coverings

Description	Thermal Resistance rc, ft2 · h · °F / Btu
Bare concrete, no covering	0
Asphalt tile	0.05
Rubber tile	0.05
Light carpet	0.60
Light carpet with rubber pad	1.00
Light carpet with light pad	1.40
Light carpet with heavy pad	1.70
Heavy carpet	0.80
Heavy carpet with rubber pad	1.20
Heavy carpet with light pad	1.60
Heavy carpet with heavy pad	1.90
3/8 in. hardwood	0.54
5/8 in. wood floor (oak)	0.57
1/2 in. oak parquet and pad	0.68
Linoleum	0.12
Marble floor and mudset	0.18
Rubber pad	0.62
Prime urethane underlayment, 3/8 in.	1.61
48 oz. waffled sponge rubber	0.78
Bonded urethane, 1/2 in.	2.09

Notes
1 Carpet pad thickness should not be more than 1/4 in
2 Total thermal resistance of carpet is more a function of thickness than of fiber type
3 Generally, thermal resistance @-value) is approximately 2 6 times the total carpet thickness in inches
4 Before carpet is installed, verify that the backing is resistant to long periods of continuous heat up to 120'F

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Source

Heat Loss Calculations and Principles, A. Bhatia
ASHRAE HVAC Handbook Systems and Equipment