What is GRP?

GRP (Glass Reinforced Plastic) also known as fibreglass, is a polyester resin which is reinforced by strands of glass fibres to form  GRP laminate. It is very strong but lightweight. GRP or Fibreglass as it is more commonly known has been around since the late 40’s. Because of its light weight, anti-corroive properties and extreme strength it is no surprise that its first mass application was in the boat building industry. Marine craft including some RNLI lifeboats are still constructed from GRP.

As the years have passed GRP proved invaluable as it uses broadened to car bodies, water tanks, building cladding and mouldings, underground pipes, garden ponds and even swimming pools.

With the correct grade of GRP resin this level of waterproofing is easily replicated on domestic and commercial flat roofs, which is why GRP is such an excellent choice for a flat roof application.

Installation of GRP Roofing

Most domestic flat roof installations are completed between one and three days depending on their size and complexity.

The old roof covering is removed and an exterior structural grade plywood deck is laid and screwed down to the timber joists, various pre-formed trims are then fixed around the outer edges of the roof. The GRP system is laid over this new deck.

The GRP system consists of a combination of four layers of polyester resin and reinforcement which bond to each other and laminate to the edge trims and plywood deck. The finished roof becomes one single maintenance free covering with no joints or seams stretching over the entire roof area regardless of the size or complexity, and what’s more it’s guaranteed watertight for 25 years.

No job is complete until all the waste is removed and the property is left clean and tidy, in fact if it were not for the new roof you would never have known we had been there at all.

flat roofing needs replacement

Old Felt Roof

GRP fibreglass flat roof structure

New Structure for GRP

GRP fibreglass flat roof finished

New GRP Roof