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Factors such as the pitch (the angle) of your roof, features like chimneys and skylights, and the roof size all affect the time and effort — and so the cost — of the replacement. How long a flat roof lasts depends on the materials used and maintenance performed. For example, a modified bitumen roof or a built-up roof can last for 10–20 years. Products such as thermoplastic polyolefin and spray-on coatings of polyurethane foam, acrylic, or silicone may be just as durable. They are typically composed of a single layer of waterproof material, often a deck board with felt and adhesive layers, but sometimes a sheet of metal. Like most significant home improvement projects, you need to get a building permit when you replace your roof.
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