Fibreglass roof installation is normally laid in either one or two layers, usually with a joint-less finish. Fibreglass roofs are made in grey. Most fibreglass roofs are material guaranteed for 20 years but the roof usually last much longer if well looked after; cleaned and maintained. Fibreglass is expensive due to material costs, and is as flexible as rubber it is incredibly resistant to damage and repairs are very easy and almost un-seen. Fibreglass roof installations are a great choice as they are extremely weatherproof and at little risk of leaking or developing frost damage (Fibreglass is also used on the hulls of some boats to give you an idea of strength). If you can stretch to the extra cost then it is well worth the money in terms of both durability and aesthetics.