TempShield® is used as insulation against radiant heat transfer and can be used to its greatest advantage in instances where radiation is the predominant means of heat transfer. It is the bright aluminized film surface of all TempShield® products that gives it its insulating properties. Size Sq Ft Per Roll 48" x 75' 300 Sq Ft 72" x 125' 750 Sq Ft TempShield® Double Bubble White/Foil Reflective Insulation is 1/4" thick and is designed for walls, basements, crawl spaces, metal buildings and under slab radiant heating systems. TempShield® Double Bubble White/Foil Reflective Insulation also serves as vapor barrier. Available in 300, 500, 750 sq. ft. rolls. Key Features: Clean, lightweight, easy to install Class A / Class 1 Fire Rating Saves energy and money High Thermal R-Values Installation requires no special tools or clothing Does not promote the growth of fungi or bacteria High-Efficiency Performance Thin, lightweight TempShield® provides resistance against the three types of heat flow: conduction, convection, and radiation. It forms an effective barrier against moisture, air currents, and vapors while resisting mold, fungus, insects, and nesting rodents. Easy to Use TempShield® is lightweight, compact, and pliable; yet resistant to punctures, tears and cracking. Installation is quick and simple, and it conforms easily to fit complex shapes. Cost-Effective and Versatile TempShield® is an economical solution for a wide range of industrial, manufacturing, and consumer applications. It costs about half as much or less than the common conventional insulation.