Determining R-Value

Measure the existing fiber glass batt insulation, rock-wool insulation or cellulose insulation in your attic. Use the following information taken from the D.O.E. Insulation Fact Sheet to calculate the R-Value of your insulation.
R-11 = 3 to 4 inches

R-19 = 5 1/2 to 6 1/2 inches

R-30 = 9 to 10 inches