Rmax Multi Max 4ft x 8ft - All ThicknessesRmax Multi Max is the glass fiber organic mat facers make this product compatible with virtually any roofing system. It 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. Specify Multi Max FA 3 for use with single ply, built up and modified bitumen membranes or metal panel roofing applications. Applications: Built up roof Modified
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