Building insulation is identified and labeled by Rvalue. "R'' stands for resistance to heat flow. (The higher the R-value the greater the insulating power. Ask your seller for the fact sheet on R-values.) The Rvalues are printed on the insulation batts and rolls.

Most common R-values of batts and rolls are 11, 13, 15, 19, 21, 22, 25, 30, and 38. R-values can be added. If, for example, a ceiling requires R-38 insulation, two layers of R-19 batts or rolls can be used.

Note: When batts or rolls are compressed to less than the design thickness during installation, the installed R-value will be reduced.