Flat roof insulation EUROTHANE Bi3 on wooden deck with mechanically fixed single ply waterproofing - not bitumenstock

The thermal insulation will be realised by a board of rigid polyurethane foam (EUROTHANE Bi3) with a core volume weight of ± 30 kg/m³.
The boards will be faced on either side with a bituminised glass fleece.
The boards will have been subjected to a permanent quality control conducted by an acknowledged institute. 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 600 mm x 1200 mm. The insulation boards are mechanically fixed in the supporting structure with at least 4 screws per panel.
Previously we place on the wooden underground:
- a partition layer consisting of rough glass fleece or polyestermat.
- A vapour control barrier on synthetic base which is fixed together with tha insulation boards.
The boards are installed staggered and with closed joints. The single ply waterproofing has to be applied immediately after the installation of the insulation and will be mechanically fixed through the insulation boards into the wooden supporting structure. The instructions of the manufacturer of the waterproofing should be followed. Previously a partition layer consisting of a polyester fleece with short fibres of 300 g / m² at least or another fleece defined by the waterproofing manufacturer should be installed.
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 is applicable, if unavailable use the guidelines of the note 215.
The following dimensions have to be used: