Reflectix BP48050 48" x 50" Bubble Pack Insulation Reflectix BP48050 48" x 50" Bubble Pack Insulation Features: Reflective insulation for use in a crawl space, attic, wall, metal buildings, and post and frame structures Fiber free, environmentally safe, easy to install, and lightweight Made up of seven layers, two outer layers of aluminum foil reflect most of the heat which hits them Each layer of foil is bonded to a tough layer of polyethylene for strength Two inner layers of bubble pack resist heat flow, while a center layer of polyethylene gives additional strength No protective gear needed to install Reflects 97% of radiant energy -60 Degree F to 180 Degree F temperature range 5/16" thick 48" x 50" roll