R-values Aren’t Always Useful

By Steve Maxwell
Published on July 15, 2005

R-values are a measure of a material’s resistance to heat; the
higher the value, the better the insulative properties. Although
they are a convenient and common yardstick to measure thermal
performance, the usefulness of them is limited.

In a 2000
study
by Brock University in Ontario, two almost identical

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