Reach Barrier DD48025 Air Double Reflective Polyethylene Insulation Roll, 4-Feet by 25-Feet 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 Reflective Air Insulation meets ASTM standards and complies with Building Code This insulation roll is 25-feet long, 48-inches high and .03-inches thick