Specialists in all types of roofing

GRP Fibreglass Roofing

Goff Roofing are GRP fiberglass flat roofing installers.

Key Benefits of GRP Fibreglass Roofing  


  • New_GRP_Roof_350.jpgCold Applied, No Naked Flames.

  • Seamless Waterproofing, No Joins or Welds.

  • Can be applied on complex roof designs.

  • Variety of colour and finishes.

  • Tough, hard wearing.


  • Fully Reinforced.

  • Rapid curing.

  • Cool cure system can be applied at 0 degrees

  • BBA Approved.

  • 25 Year Guarantee.


What is GRP?

A: GRP is an abbreviation for Glass Reinforced Polyester, otherwise known as Fibreglass Roofing or Glass Fibre. GRP materials have been extensively used within the marine and automotive industries for over half a century for use on boat hulls, car bodies and even lightweight aircrafts. This technology has been developed for use on roofing systems and become a highly popular choice for flat roof applications.

What does a GRP roof consist of?

A: GRP roofing consists of several layers. Firstly a base layer of cold applied polyester resin is applied onto new 18mm OSB3 timber decking (preferably T&G), the base layer is consolidated and reinforced with a layer of fibreglass matting (typically 450 or 600 g/m2), then an additional layer of resin is applied to form the main waterproofing laminate. The system is made complete with an arrangement of pre-formed GRP edge trims to form drip and water check, flashing details. For the final appearance a coloured topcoat is then applied to the roof and left to cure.

Is GRP roofing cost effective?

A: Yes, when comparing costs on flat roof materials, GRP is surprisingly cost effective. GRP roofing is more expensive than a re-covering using traditional materials, however please bare in mind that a quote for GRP will include for new 18mm OSB3 decking boards as part of the price.

Can I walk on my new GRP roof?

A: Yes, one the inherent properties of GRP fibreglass is a tough, hard wearing surface which is puncture and impact resistant. When used in conjunction with a 600g/m2 reinforcement matting GRP can be used for balcony and walkway applications.

Does a GRP roof have joints?

A: No, GRP roofs are free of joints or seams due to the nature of it's cold applied resin application. Regarding of shape or size a GRP roof is completely seamless.

How long does it take for a GRP roof to cure?

A: GRP resins are mixed with catalysts to enable rapid curing even at low temperatures. Typically a GRP roof will harden with an hour of application depending on site conditions.

Can a GRP roof incorporate new insulation?

A: Yes, a GRP roof can be incorporated into warm or cold roof design. Where an existing felt roof is present a warm roof conversion can be achieved by overlaying new PIR insulation boards over the existing felt roof.

What colour and finishes are available?

A: As standard GRP roofs come in a dark grey smooth finish, however any BS or RAL topcoat pigments can be made available to order. Various non-slip finishes are also available for foot traffic applications.

What is the guarantee?

A: All GRP roof installations come as standard with a 25 year materials and workmanship guarantee. This covers the customer in the eventuality of water ingress by means of material failure.

GRP and Fibreglass Flat Roofing Systems

GRP 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. GRP 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.

GRP Fibreglass Flat Roofing

Is robust and aesthetically pleasing to the eye.  We can provide a non slip finish that is suitable for balcony’s or roofs that have foot traffic.  The entire roof surface and edge detail are formed as one continuous membrane which bonds to the new roof deck, effectively encapsulating your flat roof in a monolithic skin which contains no joints.  

GRP comes with a 25 year guarantee and is maintenance free.  In our experience a professionally applied fibreglass roof will last a lot longer than 30 years. Compared to an average life expectancy of bitumen based materials, the life expectancy of a fibreglass roof is far greater than other flat roof products making it a cheaper option on a year by year basis.


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The unique thing about Goff Roofing is that whoever visits you to prepare a written quotation (usually Ian or Jason) will actually be involved in the fitting process, providing you with a continuity of service which is becoming exceedingly rare these days.