Insulation is identified and labeled by R-value. “R” stands for resistance to heat flow.
The higher the R-value, the greater the insulating power.
Manufacturers of insulation products print the R-values of their products either on bags or on labels
attached to plain bags.
In most cases, R-values are also printed on the facings of batts and rolls.
On unfaced insulation, the R-value is printed on the product or indicated by stripe coding