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ProGRP is a new advanced liquid applied GRP – Glass Reinforced Polyester - flat roof system. It has been specifically engineered for flat roof applications in the UK market. It is a fully integrated seamless system where all the components are designed to work together to ensure that you can take full advantage of this rapidly expanding market.  


ProGRP can be used on virtually all types of flat roofs up to and including vertical surfaces for example the cheeks of a dormer or the inside face of a mansard or parapet roof.

We have extensive experience using GRP to solve the problems often associated with failed leaking bitumen felt roofs and we are here to help you.



At Jon Chambers Windows we offer two types of flat roofing options available and click the images below if you would like to see the benefits of each individual product and how we install them.

The ProGRP laminate is fully resistant to wind upliftAnti slip resistant finish available. 

Fire retardant (BS476 PART3 EXT.F.AB)

Description and specification:

A ProGRP roof is a wet laid, single ply GRP laminate made up of two layers of catalysed resin sandwiching a layer of chopped strand glass fibre mat (450/600gsm).


It is applied to a new OSB T&G3 board. Profiled GRP edge trims are applied to the roof edges and abutments and the roof is finished with a coat of catalysed pigmented top coat.

System Features:

All ProGRP components are engineered to be used together.

Range of profiled edge trims to suit all applications.

  • 25 year materials guarantee.

  • Low styrene emission resins.

  • UV resistant.​

Resistance to foot traffic:

ProGRP is available with two grades of chop strand matting (CSM).

450gsm CSM for areas of occasional foot traffic.

600gsm CSM for areas of heavy foot traffic or load bearing(decking, promenade tiles, green roofs) in conjunction with a slip resistant finish.

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