The latest in green products. LP. Installed like traditional OSB, LP TechShield radiant barrier sheathing can prevent up to 97% of radiant heat in the panel from entering a home's attic, and produce summertime energy savings of up to 20%, the maker says. Standard panels measure 4 feet by 8 feet in five thicknesses. The panels are APA Exposure 1 rated OSB and come with a 20-year transferable limited warranty that covers the aluminum, OSB substrate, and lamination process. 888.820.0325.