INCLIMANT is a system comprising a self-extinguishing Sintered Expanded Polystyrene panel cut at an angle, laminated with an plastomeric membrane either 2mm thick with a reinforced fibre glass mat carrier, or 3mm thick with a polyester nonwoven carrier. The INCLIMANT panel is sized to suit the design of the roof (pitch). INCLIMANT combines quick and easy installation with the option of producing a continuous waterproofed roof by virtue of the side and end lap selvedges.