Bitumen – this method of flat roofing has traditionally been a multilayer system. Comprising of a vapour control layer, a base layer and a top layer (capsheet) of bitumen rolls. The systems are generally hot bonded using a gas torch. There are many different roof constructions such as a cold roof, warm roof and inverted roof. A large manufacturer in the UK has recently begun to offer a product warranty of up to 40 years on their various systems. Like many other flat roof systems, bitumen can suffer various problems.

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