Celotex Crown Bond products can be installed in accordance with these instructions
Celotex insulation boards should not be installed when the temperature is at or below 4°C and falling.
- A suitable vapour control layer, usually part of the single ply membrane system, will be mechanically fixed or adhered to the deck using adhesive.
- Celotex Crown-Bond is bonded to the vapour control layer, usually with a PU adhesive as specified by the manufacturer. Particular attention should be paid to using the correct pattern and amount of adhesive to ensure that adhesion to the roof deck will resist the calculated wind load.
- The SPM is then bonded to the top side of the insulation.
Cold applied system
For single ply membranes, the vapour control layer (VCL) should be either polythene or reinforced aluminium foil. The VCL should be loose-laid immediately prior to installation
of the Celotex Crown-Bond board and detailed at edges and abutments. The VCL should be sealed and taped to the top surface of the board.
Different types of weathering systems require different installation instructions and guidelines. Advice on the installation of these weathering systems should be sought from the manufacturer or provider of the weathering system.
When using adhesives, the installer should take care not to use products that contain chemicals likely to attack the insulating foam such as ketonic solvents. Celotex Crown-Bond contains no chemicals or solvents likely to damage a single ply membrane. When using adhesives, the installer should check the compatibility of the adhesive with the adhesive manufacturer.
It is recommended that boards are laid closely butted with joints break-bonded.
Celotex Crown-Bond can be installed as part of a two-layer system. The two layers of insulation should be staggered or horizontally offset against each other to prevent one vertical joint and mechanically fixed to the substrate.
The supporting deck must provide adequate support for the VCL and insulation board with joints being supported by the ridges of the deck. It must be capable of supporting the static and dynamic design loads and the loads associated with the construction activity without deflection in excess of the limits defined in BS EN 1991. The deck must be structurally sound, dry, clean and, where necessary, primed before application of the weathering and insulating system.
Celotex Crown-Bond is capable of withstanding the trafficking associated with normal roof laying work. However, roofs are generally designed for only occasional lightweight foot traffic or maintenance access. Where more frequent or heavier access is required, protected walkways should be provided. Under no circumstances should the roof be used as a working platform, either during or after the construction programme.
Celotex insulation boards should be stored dry, flat and clear of the ground. Only as much material as can be installed during a single working period should be removed from storage at any one time. If boards are stored under tarpaulins, care should be taken to prevent rope damage to boards.
When cutting Celotex insulation, dust extraction equipment, eye protection and face masks should be used. Dust or particles in the eyes should be washed out with liberal quantities of water. If skin is sensitive to fibre irritation, apply a barrier cream to exposed areas before handling.