EW1108 Diamond GRP Roofing System


This is an assessment of Diamond GRP Roofing System, used for waterproofing of roofs.

A Diamond roof is a single-ply GRP laminate consisting of Diamond Resin and Reinforcement Chopped Strand Mat applied in situ over 18mm OSB3 deck. The roof is finished with pre-formed GRP edge trims and a coat of Diamond Topcoat. To achieve the BS 476 Part 3 – F.AC Fire Rating the Fire Retardant Topcoat with granulated finish must be used.

Diamond GRP Roofing System offer a 25 year guarantee on roofing materials.


Valid until 23rd November 2022


Please Note: Every care was taken to ensure the information was correct at the time of publication. Any written guidance provided does not replace the user’s professional judgement. It is the responsibility of the dutyholder or person carrying out the work to ensure compliance with relevant Building Regulations or applicable technical standards.


Permavent LTD
11 Cumberland Drive
01305 766703