Rmax Multi-Max® FA-3 is an energy-efficient thermal insulation board composed of a closed-cell polyisocyanurate (polyiso) foam core bonded to glass fiber/organic mat facers on both sides making it compatible with virtually any roofing system. Multi-Max® FA-3 is suitable for use in single ply, built-up, metal panel and modified bitumen roofing applications. This polyiso insulation is approved for use in new and retrofit/recover roofing constructions over steel, wood, non-combustible and certain types of nailable roof decks.