The CoolRoof solution can be applied to many substrates: glittery bituminous membrane, lacquered steel tray, porous concrete, natural tiles and slates, fiber cement, polycarbonate, fiber polyester, steel and aluminum. PVC, EPDM, TPO and smooth waterproofing membrane substrates are not currently compatible. It is not recommended to apply our CoolRoof to areas of water stagnation (flat surfaces).