Roofing with fibreglass
The selection of fibreglass, sometimes known as GRP (glass reinforced plastic) is very popular due to its strength and ease of handling, as well as economical in comparison to metal products. GRP is light yet robust and although it may not be as strong as carbon fibre, it is less brittle and more flexible. Fibreglass can be used in many applications including in the production process of roofing laminate, in door and chimney surrounds and as insulation, which is important when constructing a roof. Due to it being lightweight and flexible, it can be used in areas which are difficult to access.
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Other benefits of using fibreglass are that it is economical, lasts 20 years, repairs to the roof can be effected quickly and easily, can be extended to other areas of an existing roof, can prevent intruders entering your property through the roof, has no value as with a lead roof, and can be tiled so the roof can be used as an outside area.
Fibreglass has been used in roof construction for many years and is can be installed by any do it yourself enthusiast. Resin is sold in kit form as either resin only or with a topcoat available in a number of different colours. When applying the products, you will need to take into account the weather as some resins and top coats will not cure below 50C or over 350C. If the temperature is less than 100C, then the resin should be warmed before being used. The sun is a contributory factor in the curing of the GRP and, if you are laying a fibreglass roof in winter, it is unlikely that the topcoat will cure overnight and will allow debris such as leaves to stick to it or the finish may be unsatisfactory if it rains and the topcoat has not cured. If it starts to rain while you are laying the roof, cover it with a waterproof sheet. The topcoat of the fibreglass will need to be completely dry before continuing.
Before applying the fibreglass, you will need to ensure that the existing surface is clean and dry before applying. If the decking is warped or wet, you will need to ensure that damp has not penetrated the roofing joists and that there are no signs of rotting. If the decking is wet, it will need to be replaced before proceeding with the fibreglass.
Whether you have carried out the work on repairing or fitting your roof or whether you have employed a roofing contractor, the main objective is to ensure that the roof is watertight and that the fibreglass is cured before any tiling or other work is carried out. This will minimise future problems with your roof. Flat roofs in particular are prone to leakage and every care should be taken to do the preparatory work thoroughly before applying the final finish.
