ROXUL® Stone Wool insulation products, the only ones that meet FM’s 4470 NCC standard for non-combustible core, are specifically designed and manufactured for the roofing industry. They provide the optimal combination of insulation value, fire resistance, dimensional stability and acoustic performance. Both are compatible with most roofing systems, air/vapor barriers, membranes, fasteners, and various adhesives. They are not susceptible to damage from asphalt. They are chemically inert and non-corrosive with no off-gassing, and are resistant to rot, mold and fungi. ROXUL roofing insulation is also well suited for use in recover projects over existing membranes because of its ability to conform to substrate irregularities without cracking or breaking.