Definitions for r-valueˈɑrˌvæl yu
ADVERTISEMENT
Random House Webster's College Dictionary
R-val•ueˈɑrˌvæl yu(n.)
a measure of the resistance of an insulating or building material to heat flow, expressed as R-11, R-20, and so on; the higher the number, the greater the resistance to heat flow.
Category: Building Trades
Ref: Compare U-value.
Origin of R-value:
1945–50; R, symbol for resistance
Wiktionary
r-value(Noun)
Resistance-value - A measure of thermal resistance used in domestic insulation.
Citation
Use the citation below to add this definition to your bibliography:
"r-value." Definitions.net. STANDS4 LLC, 2013. Web. 21 May 2013. <http://www.definitions.net/definition/r-value>.