What is Glass Reinforced Plastic (GRP)?

GRP is the material of choice in many industries. It is used to make a large variety of items from luxury yachts, to parts on buses, trucks and trains, to garage doors, caravans and sports cars. Companies have been making parts out of GRP for over 60 years.

In simple terms, GRP is a mixture of polyester resin with glass reinforcement, coated with a polyester topcoat to give improved aesthetics.

A Brief History of GRP

Fibreglass, or GRP (Glass Reinforced Polyester) was discovered in the late 1940’s. It was quickly adopted during the 1950’s and 60’s for a wide range of applications where its corrosive-proof properties allied with its high strength and excellent appearance soon proved to be invaluable. Its first main application was for boat building, where it gained acceptance in the 50’s and is still widely used today.

The uses for GRP have since broadened to the extent that it has now become the standard material for the construction of small craft, water tanks, building cladding panels, roof lights and of course high performance waterproof coatings. In the last ten years a rapid growth has occurred in the GRP roofing industry as more and more people realise the benefits of GRP.

The Problem with Felt

Traditional Bitumen based coatings have been in use for over two thousand years with varying degrees of success. It has always been widely accepted these roofs would require regular replacement as each layer of the roof breaks down and becomes ineffective. Alternatives were the use of expensive metal coatings such as copper or lead, or the even more expensive option of installing a pitched roof over the existing flat roof.

GRP is a cost effective, dependable solution to these problems, which is why its unrivalled performance protects millions of square metres of roofs throughout the UK.

Benefits of GRP

Why choose GRP?

GRP is chosen in many industries for its strength, appearance, weather resistance, longevity and cost and these characteristics make it the optimum choice for roofing. When installed by a trained contractor it brings many advantages.


Fibreglass can be used on patios, balconies, walkways, roof gardens as well as complex roof shapes. It can be applied up to decking, skylights, pipes, vents, stairs and walls.

Cost Effectiveness

It will last for many, many years. It is maintenance-free (no painting required) and can be refurbished if you want. It can be extended if you decide to alter your roof and is easily repaired should it suffer unusual physical damage. It also replaces lead and is of no value to thieves.

You can walk on it

Our roofs will tolerate foot traffic and can be made non-slip.


GRP has been used in many applications for over 60 years and has been proven to last a long time. Parts last at least 20 years and many are more than 30 years old. This makes it an ideal choice for a roof. Traditional felt roofs rely on joints or welded seams which are potential failure points. A continuous GRP surface has no joins, no welds and no seams.

Typical Applications

  • Garages
  • Sheds
  • Dormer Windows
  • Extensions
  • Balconies


Don’t waste money on inferior roofing products, all of our GRP roofs come with a 30 Year Guarantee.