These are extruded polystyrene boards with skin surface. They are used for the thermal insulation of inclined roofs with utilized attics.
Foamboard 1500 D thermal insulation boards are applied on rafters. Every type of roof cladding can be utilized in this which is carried out without using any roof board. End strip and thermal insulation board to be used should have the same thickness. End strip is fastened to the edges of the rafters with nails along the eave. The boards are laid over the rafters at right angle starting from the end strip to the roof ridge. Care should be taken to adjust the edges properly. Then cover strips are nailed to the boards that sit on the rafters. Consequently, a vapour permeable water proofing membrane is laid over from the eave to the ridge with overlaps. Tile fastening strip which are placed vertical to the cover strips, are nailed on to the cover strips. The application is completed by fixing roofing tiles to the tile fastening strips.