Types of Home Insulation and Labeling
Fiber glass, rock wool and slag wool insualation batts and rolls comes in various thicknesses (R-Values) without a facing.
Most common R-values are R-11, 13, 15, 19, 21, 22, 25, 30 and 38. Both batts and rolls are available with or without a facing. The facing material is generally applied toward the ‘warm-in-winter’ portion of the home to help resist the movement of moisture vapor to a cold surface where it can condense. Fiber glass, rock wool and slag wool batts and rolls are most commonly installed in the sidewalls, attics, floors, crawl spaces, cathedral ceilings, and basements of homes.
R-values are on the packing as well as printed on the insulation batts and rolls themselves.
R-values are additive. 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 labeled thickness during installation, the rated R-value or ability to slow heat flow will be reduced.
Savings may vary. Find out why in the seller's fact sheet on R-values.