Flat roof insulation with EUROTHANE Bi3A on steeldeck for roofs with limited drainage and mechanically fixed bituminous waterproofing systems

The thermal insulation will be realised by a board of rigid polyurethane foam (EUROTHANE Bi3A) with a core volume weight of ± 30 kg/m³.
The boards will be faced on both sides with a bituminised glass fleece.
The boards are subject 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 ISO 9001 : 2000 standards.
The declared thermal conductivity coefficient λ_D = 0,027 W/mK for thickness › 60 mm and 0,028 W/mK for thickness ≤ 60 mm.
Pressure resistance with 10 % deformation: > 120 kPa (1,2 kg/ cm²).
The dimensions of the boards are 1200 mm x 1000 mm. The thickness varies in the longitudinal direction. The fall will be 1/60 or 1/80.
The minimum thickness depends on the corrugation opening. When the boards are moved in a supported way, this will be 1/3 of the corrugation width of the steel plate. The boards are installed with closed joints. The boards are mechanically fixed to the steel deck with a minimum of 4 fixations per board. The mechanical fixations to be used will meet the demands in compliance with the UEAtc-class II and will have a minimum diameter of 4,8 mm. The waterproofing is applied immediately after the installation of the insulation. The bituminous waterproofing is mechanically fixed through the insulation boards onto the steeldeck in compliance with the given instructions of the waterproofing manufacturer.
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. Follow the general regulations of the note 215 when the technical approvals are not available.
A tapered scheme, made by the manufacturer of the insulation boards, will be presented before the　start of the works. The plan will be made up in function of:
- the dimensions of the roof;
- the place of the outlets;
- the minimum average thickness.
The following surfaces and minimum average thicknesses have to be used: