R-value
The R-value is a measure of thermal resistance used in housing insulation. It is defined as R = ft2 F° h / Btu.For comparison, the SI unit of thermal resistance is R = K.m²/W, and 1 ft² F° h / Btu = approx. 0.1761 K.m²/W.
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For comparison, the SI unit of thermal resistance is R = K.m²/W, and 1 ft² F° h / Btu = approx. 0.1761 K.m²/W.
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