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flat roof
A flat roof is a roof which is almost level in contrast to the many types of sloped roofs. The slope of a roof is properly known as its pitch and flat roofs have up to approximately 10°.〔Harris, Cyril M.. "Flat roof". ''Harris dictionary of architecture & construction''. 3rd ed. New York: McGraw-Hill, 2000. Print.〕 Flat roofs are an ancient form mostly used in arid climates and allow the roof space to be used as a living space or a living roof.
==Flat roofs==
Flat roofs exist all over the world and each area has its own tradition or preference for materials used. In warmer climes where rainfall is less and freezing is unlikely to occur, many flat roofs are simply built of masonry or concrete and this is good at keeping out the heat of the sun and cheap and easy to build where timber is not readily available. In areas where the roof could become saturated by rain and leak, or where water soaked into the brickwork could freeze to ice and thus lead to 'blowing' (breaking up of the mortar/brickwork/concrete by the expansion of ice as it forms) these roofs are not suitable. Flat roofs are characteristic of the Egyptian, Persian, and Arabian styles of architecture.〔Passmore, Augustine C.. "Twenty Styles of Architecture". ''Handbook of technical terms used in architecture and building and their allied trades and subjects'',. London: Scott, Greenwood, and Co.;, 1904. 360. Print.〕
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