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R value

March 1st, 2011 / By: / Resources

What is R value?

R value has to do with a material’s resistance to heat flow and is most often referenced with relation to insulation, although it is also used with some interior fabric applications such as draperies and carpet. R value is the ratio of the thickness of a material to thermal conductivity. Essentially, the higher the R value, the greater the insulating effectiveness of the material. If you’re assessing the R value of an assembly, it is possible to add the R values of the component materials.

Juli Case is IFAI‘s information and technical services manager.

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