9.5mm Gyproc WallBoard factory-bonded to 17.5mm extruded polystyrene insulant that is both CFC and HCFC-free, meaning zero ODP (Ozone Depletion Potential), and less than 5 GWP (Global Warming Potential). The closed cell structure of the foam provides integral vapour control. Designed to be used in both refurbishment and new build for walls, ceilings and reveals where a medium level of thermal insulation is required to reduce heat loss from buildings.