Flat roof insulation Powerdeck with A1 reaction to fire on steeldeck with mechanically fixed bituminous waterproofing systems

The thermal insulation will be realised by a board of rigid polyisocyanurate foam (Taufoam by Recticel / Powerdeck ) with a core volume weight of ± 30 kg/m³.
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 ISO 9001 : 2000 standards.
The declared thermal conductivity coefficient λ_D = 0,024 W/mK.
Pressure resistance with 10 % deformation: > 120 kPa (1,2 kg/ cm²).
The dimensions of the boards are 1200 mm x 600 mm.
The minimum thickness of the insulation board depends on the corrugation opening of the steeldeck. When the edges are fully supported, this support amounts to 1/3 of the corrugation opening. The boards are installed staggered and with closed joints. The boards are mechanically fixed to the steeldeck with a minimum of 6 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 has to be applied immediately after the installation of the insulation. The bituminous waterproofing will be mechanically fixed through the insulation boards into the steeldeck. The instructions of the manufacturer of the waterproofing should be followed.
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: