Get excellent insulation and sound reduction with Reach Barrier 3054 Reflective Air Insulation. It has two layers of sealed air laminated between two layers of durable reflective polyethylene. Reflective Air meets ASTM standards and complies with building code. It installs easily in attic spaces, exterior and interior walls, interior masonry walls, radiant floors, metal and steel buildings, knee walls, crawl spaces, garage ceilings and many other applications where insulation is needed. This insulation roll is 125 ft. long, 48 in. high and 5/16 nominal in. thick. Reach Barrier reflective insulation products are one of the most versatile and energy efficient insulation products available. Radiant (reflective) barriers are installed in attics, walls, roof decking, and flooring. Most newly constructed homes contain radiant barrier insulation because of the proven effectiveness to decrease energy usage and cost by reducing summer heat gain and winter heat loss. Installing a radiant barrier may be the lowest-cost improvement that can produce the greatest overall reduction in energy usage and expense.