Polyisocyanuarate insulation consists os a closed-cell polyisocyanuarate foam core laminated to a glass reinforced mat facer. This insulation provides outstanding thermal performance on commercial roofing applications. Poly ISO comes in flat panels with various thicknesses from 1" to 4", in 4' widths and 4' or 8' lengths. It also comes in tapered panels with various thicknesses and sizes to eliminate ponding water by providing positive roof top drainage.