Air is one of the best thermal insulators, and fiberglass insulation makes use of it. Manufactured from glass fibers, fiberglass is woven into loose cotton candy-like bundles that can be installed ...

$42.97 at Amazon $42.97 at Amazon The zipper-type Panady Attic Stairs Insulation Cover comes ... This product consists of foil-encased fiberglass, rated R-10. It isn’t the best insulator out ...