Reach Barrier SS48250 Air Single Reflective Polyethylene Insulation Roll, 4 x 250-Feet Single Reflective Air Insulation retains air longer and provides excellent insulation and sound reduction Insulation is easy to install with no mess or fumes and will not cause itchy skin Ideal for attics, exterior and interior walls, radiant floors, metal and steel buildings, crawl spaces, garage ceilings and many other applications Single Reflective Air Insulation meets ASTM standards and complies with Building Code This insulation roll is 250-feet long, 48-inches high and .02-inches thick