EnergyGuard PolyIso Insulated Sheathing

This high-performance building envelope insulation from GAF eliminates thermal bridging, reduces air filtration, and acts as a vapor retarder for new-construction and retrofit applications. All boards are manufactured without CFCs or HCFCs, giving them zero ozone-depletion potential and making them environmentally friendly. The boards measure 4 ft x 8 ft; available thicknesses are ½, ¾, and 2 inches.