Radiant energy, the major source of heat flow, is energy in the form of infrared waves. It travels at the speed of light until it comes into contact with a surface. From there it has three options. It can be transmitted through the material, absorbed into it or reflected back. Air, water, and glass, for example, transmit visible light in varying degrees. A white surface, such as snow, reflects it; and a black surface absorbs it. Infrared waves work in the same way as visible light; heat is generated when its energy is absorbed. Common insulation products, like most building materials, tend to absorb a large percentage of the radiant energy they encounter as heat. However, tests have shown that one sheet of aluminum in the center of an airspace reflects 97% of radiant heat. This means heat rays pass through it at a rate of only 3%. Properly installed Ply-foil radiant barrier insulation takes full advantage of this property by using two or more such surfaces separated by encapsulated air.

PLY-FOIL comes in large, light weight, easy to handle rolls that will not blow away or break up in the wind. Installers will like working with the product because there are no fibers to cause skin itch or make breathing difficult. Ply-foil, properly installed and taped, provides an excellent vapor barrier, assists in limiting condensation and features the top classification of burn and flame spread ratings. It will not absorb water if left outside at the job site or if it is left partially uncovered during installation. Ply-Foil typically will not mildew or allow fungus growth and it is resistant to mice, birds, and insects. Ply-foil's reflective foil insulting material will add energy efficiency to your property, reducing your utility bill.