Diamond GRP Flat Roofing System


This web site has been specially designed to provide all the materials and information that you will need to install the Diamond GRP waterproof system and also check the £10 no deposit slot bonus. We have specially designed resins, topcoats and preformed GRP trims as well as offering all of the high quality GRP tools that you will need to buy online. You also can buy online all of the GRP materials and flat roof trims on this website and you can understand the application and installion process of all the trims, matting, resin and topcoat and combined with our indepth instruction manual you will soon become a GRP specialist.

What is Diamond GRP?

Diamond Glass Reinforced Polyester (GRP) roofing is a specially adapted composite material made from a reinforced polyester resin that forms a tough, versatile and long lasting waterproof layer that can be applied to any substrate. General purpose resin for moulding is often thick and more rigid whereas flat roofing requires a specially blended resin that can be applied in a thin layer over a large area and the Diamond GRP flat roofing system has been designed to provide a thin, flexible and permanently watertight single ply membrane over any substrate. The Diamond GRP Topcoat has special Ultra violet additives that will significantly reduce the harmful effects of the sun and keep the roof waterproof for decades. Diamond GRP is able to withstand extremes of temperature as well as being unaffected by chemicals or roots.

GRP Flat or pitched Coloured Roofing

GRP Diamond GRP Topcoat, although usually grey, can be specially coloured for architectural purposes. Diamond GRP can be applied in a mix of colours and Delabole slate can be rolled in to provide a non slip surface to areas such as walkways on large roofs or kitchen areas. Although Diamond GRP comes in a standard grey it can be produced in any of the RAL colours www.ralcolor.com to provide a unique architectural look to any project.


Simulated Lead Replacement

Diamond GRP can be used as an excellent substitute for replacing roll mop lead roofs where damage and theft is prevalent. Diamond GRP trims can replicate existing lead flat roofs and can be coloured to match any style or age. Diamond GRP flat roofs do not have a resale value and will illiminate the risk of theft of lead flat roof.

Green roofs

Green roofing underlays often require a special root barrier to protect the green roof underlay from attack from the roots of the green roof. Diamond GRP flat roofing is the perfect solution as a flat roofing underlay because its Diamond tough finish is completely unaffected by the roots from a green roof covering

Wet rooms

Diamond GRP is the ideal product to use as a waterproofing layer for wet-room floors. It is thin, tough and versatile and can be laid tight into corners and up walls. It will bond to all forms of prepared timber (bad condition floors can be over-boarded with a thin plywood) and Diamond GRP can be applied directly onto concrete floors when primed with G4 primer. The floor can be left as a smooth finished floor or made non-slip or ready for tiling with delabole slate that is rolled into the topcoat. Tiles can be applied directly over Diamond GRP in the usual manner to create watertight wet room floor that is durable as well as flexible enough for timber floors. The addition of delabole slate that is rolled in when applying the Topcoat means that GRP can also be used for commercial wet areas such as shower room floors, changing rooms, kitchen areas and its diamond tough coating can be easily cleaned time and time again and will remain sanitary.

Swimming pools

Diamond GRP can be used as a waterproofing layer to a swimming pool that is then tiled over or simply used as a finished product in a choice of colours. GRP is already the preferred choice for many recreational products such as hot tubs and waterslides.

Tanking and waterproofing below ground

Diamond GRP is the ideal solution for tanking and waterproofing. An ‘F1000’ GRP sheet can be fixed to the wall using stainless steel fixings drilled through the sheet and fixed using penny washers. The whole wall and floor can then be covered in a one piece layer of Diamond GRP to form and impenetrable waterproof barrier. The topcoat can have grit added to aid adhesion and Thermal plasterboard can then be adhered either using plasterboard adhesive or PU fixing foam to form a habitable room. The floor can then have screed or floating floor laid directly onto it. Diamond GRP is so versatile that battens can be laid into the mat over the waterproofing layer to allow screw fixing without damaging the waterproof layer. Diamond GRP is completely neutral and cannot be contaminated and is therefore so versatile that it can also be used in extreme situations from safe water storage to cess or slurry pits. 

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Ponds or water storage

Diamond GRP can be used as a safe, tough and versatile pond lining that can be formed into any shape and can form an independent lining that will remain waterproof for decades. It can be laid in any colour and is completely non-toxic and will remain free from contaminants and cannot be broken down by roots.

History of GRP

GRP was discovered in the late 1940’s. It was quickly adopted during the 1950’s and 60’s for a wide number of applications where its corrosion proof properties, allied to its high strength and excellent appearance soon proved to be invaluable. Today, it has become the standard material for the construction of small craft, water tanks, processing vessels, building cladding panels and roof lights.

When used for roofing, GRP provides a completely weatherproof system without any of the problems associated with traditional roofing materials. Its unrivalled performance protects millions of square metres of roofs throughout the UK, to the extent that there are GRP roofs laid more than thirty years ago and are yet to show signs of deterioration.

While GRP roofing boasts qualities that make it the best roofing system money can buy, these qualities are dependant on how the roof is laid. A GRP roof will fail if it is laid incorrectly. The performance of the roof is therefore reliant on the installer’s ability to lay it.

Other Uses for GRP

The durability and lightweight qualities of GRP make it an ideal construction material for applications as diverse as lorry aerofoils and roofs, transport containers, micro-light body parts and automotive body panels. GRP is also used in hostile industrial settings for applications such as tanks and underground pipes. This is due to its ability to withstand high temperatures and its resistance to chemicals.

Unlike any other roofing material, GRP has properties that render it ideally suited to small craft construction. As well as being an inexpensive material, it is robust, flexible and will never corrode. A number of RNLI lifeboats are constructed completely from GRP. Lifeboats such as the Atlantic 75 are used in heavy weather for inshore rescue. GRP is also used throughout the automotive industry for after-sale body kits, body repair kits, kit cars, and body panels for production cars.

The GRP Roofing Market

GRP has been used for roofing applications for over fifty years. Technological advances in resin production and altering its material properties over the last thirty years have led to the manufacture of resins specially formulated for roofing. GRP roofing started to gain popularity in the mid eighties and now accounts for between 1-2% of the UK's roofing market covering millions of square metres of the UK’s roofs.

What is a GRP Roof?

The GRP roofing system is constructed from a single-ply GRP laminate applied in situ over 18mm OSB3 deck. The roof is finished with GRP edge trims and a coat of GRP topcoat.