Flat roof insulation EUROTHANE Bi3 on concrete deck with loose-lying bituminous waterproofing

The thermal insulation will be realised by means of 100% CFC-free boards of rigid polyurethane foam (EUROTHANE Bi3) with a core volume weight of ± 30 kg/m³.
The boards will be faced on both sides with a bituminised glass fleece.
The boards will have been subjected to a permanent quality control conducted by an acknowledged institute and will have a technical approval. The production of the insulation boards is certified according to the NBN-EN-ISO 9001:2000 standards.
The declared thermal conductivity coefficient λ_D = 0,027 W/mK for thickness › 60 mm and O,028 W/mK for thickness ≤ 60 mm.
The compression resistance with 10% deformation: > 120 kPa (1,2 kg/cm²).
The dimensions of the boards are 600 mm x 1200 mm. The insulation boards are fully bonded on the vapour barrier using hot bitumen, or another solution is that the insulation boards are bonded in stripes to the vapour barrier using cold glue. A heavy ballast (gravel, tiles or a monolith protection such as concrete or asphalt) will be installed on this in order to set off wind forces in compliance with the prescriptions given by the manufacturer of the waterproofing membrane. If tiles on tile carriers are used then the ground surface will be defined in such a way that the compression force on the insulation where the tile carriers are situated does not increase above one fourth of the pressure resistance of the insulation material measured with a compression of 10 %.
The necessity of a vapour control layer will be determined by a calculation or by the Technical Information 215 "HET PLATTE DAK" (the flat roof) of the WTCB. The specific guidelines incorporated in the Technical approval of the insulation material are applicable; when not available the general conditions of the note 215 are applicable.
The following surfaces and thicknesses have to be used: