Flat roofs are used in the areas which have less rainfall and no-snow fall during the year. Drainage in a flat roof is a major problem unlike a sloping roof which has an excellent drainage facility.
A material which could be arranged in a trussed form and which satisfies the general requirements of a roof could be used. For short spans wooden flat roofs are used with adequate weathering course. Moderate to large spans RCC flat roofs are preferred. For very large spans steel roofs have to be resorted to. Three of the important flat roofs are discussed below.
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