SuperFelt: Made from 80% recycled fibers, provides deep, rich sound by absorbing sound. Extremely high temp manufacturing process treats fibers. Mold & mildew resistant. 3mm pad corrects minor subfloor imperfections. 2 mil thick top film protects from harmful moisture vapor. Added R-Value to chilly floors. For use under laminate and engineered hardwood floors. Excellent for radiant heat floors. Can be used below, on and above grade subfloors. Includes adhesive strip and 3″ overlap film. 44″ x 27.3′. 100 sq ft/roll. 1/case, 36 cases/pallet.