GRP is a wet-laid laminate made from cold, applied, pre-accelerated, unsaturated polyester resin solution in styrene, reinforced with emulsion bound chopped strand mat. It is finished with a pigmented polyester topcoat and cured with peroxide catalyst to give a monolithic, fully bonded GRP layer of either 450gm or 600gm glass content.
In other words, it is a layer of GRP laid to a prepared deck to form a waterproof layer that will last & last & last!
GRP is a monolithic laminate that contains no welds or joints, designed to give MAXIMUM performance.
The Glassfibre layer is formed directly onto the new deck and bonds to the decking boards to form a fully bonded roof. In this example, OSB Sterling Boards have been selected.
The entire roof surface and all the edge detail are formed in one continuous piece of GRP bonded to the roof deck and any associated structures. All preformed details including outlets, edge trims, flashings etc are made from GRP so that there can be no difference in the rates of expansion.
Because the roof laminate is fully bonded it can be applied to form a warm roof without the possibility of interstitial condensation.
We start with a typical roof of traditional felt over timber that has reached the end of its life - a roof that leaks and has already gone through the systematic repair over the years to seal against leaks.
We then form a completely new deck using sterling OSB3 conditioned boards. These tongue and grooved boards in 2400x600mm are laid to staggered joints to form a completely new decking.
Once all the trims are in place each joint is carefully laminated with GRP 450gm bandage to provide additional structural strength at all joints and roof detail.
After the deck and trim details are completed the roof is laminated.
The roof is finally sealed with a further coating of polyester top coat. This is pigmented to improve both the final appearance of the roof and to seal the fibres in the surface against any water ingress.
The top coat can be pigmented in any colour, although we recommend a light grey colour to diminish thermal gain.
The top coat will also stop any UV transmission into the body of the GRP layer and allows additional coatings to be applied to provide a choice of finished textures. For more information and advice on GRP roofing, contact us today. Call 01624 626181 or message us on Facebook!