Reach Barrier DD24100 Reflective Air² Insulation features two layers of sealed air which are laminated between two layers of durable reflective polyethylene. This gives Reflective Air² the ability to retain its air longer and provides excellent insulation and sound reduction. Reflective Air² meets ASTM standards and complies with Building Code. The insulation roll is easy to install because there is no mess or fumes and will not cause itchy skin. Reach Barrier"s Reflective Air² Insulation is ideal for: 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 100-feet long, 24-inches high and .03-inches thick. Reach Barrier"s 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.