Flat roof insulation with EUROTHANE Bi3A on wooden deck with limited drainage and with bonded single ply waterproofing systems: bitumenstock

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 either side with a bituminised glass fleece.
The boards are subject 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 1200 mm x 600 mm. The thickness varies in the longitudinal direction. The fall will be 1/60 or 1/80.
The insulation boards are:
- either fully bonded on the vapour barrier by means of hot bitumen
- or mechanically fixed in the bearing structure with a minimum of 4 screws per panel. The correct amount of fixations will be defined on the basis of the quality of the fixations and the bearing structure and the wind load.
Preceding we place on the wooden underground:
- a partition layer of glass fleece or polyestermat
- an underlayer P150/16, reinforced bitumen with polyestermat, nailed to the underground
- a vapour control layer bonded with hot bonding or torch-on method. In case of mechanically fixed insulation a vapour control barrier on synthetic base is possible which is then fastened together with the insulation boards. The above lying underlayer can then be dropped as well.
The waterproofing is applied directly after the installation of the insulation. The single ply waterproofing is fully bonded immediately after the installation of the insulation by means of a compatible cold glue and in compliance with the prescriptions given by 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 dimensions have to be used: