Description Fibreglass roof installation GRP (Glass Reinforced Polyester) roofing system constructed from a GRP laminate made from specially formulated Roofing Resin and Reinforcement Mat. The laminate is applied over a securely fixed OSB3 18mm T & G deck, the perimeter is finished with GRP edge trims and the entire roof is coated with topcoat which is available in a choice of colours and finishes. The system comes complete with a 20 year guarantee on the materials from the manufacturer and a guarantee from the installer that the flat roof will remain leak free for at least 20 years. The GRP System can be used for almost any roofing application including: