ENRGY 3® Foil Faced is rigid roof insulation boards composed of a closed cell polyisocyanurate foam core bonded in the foaming process to a tri-lam foil facer on both sides. ENRGY 3 Foil Faced meets the physical requirements of ASTM C 1289, Type I, Class I. ENRGY 3 Foil Faced provides high thermal value over metal, nailable, and non-nailable roof decks. ENRGY 3 Foil Faced, with their low vapor permeability, are excellent choices for cold storage or metal building applications. The foil facers provide a suitable surface for mechanical attachment to a structural deck. ENRGY 3 Foil Faced has each been classified by Underwriters Laboratories Inc. as an approved roof insulation component in many Class A ballasted and mechanically attached roof constructions and Roof/Ceiling hourly fire-rated assemblies.