A roof is a covering on the enclosure made for a building. It is essentially provided to protect the inhabitants from the eflect of sun, rain, wind, etc... The type of roof depends upon the local climatic requirements. For plain regions, where the rain fall is less as compaired to hilly or coastal areas, flat terraced roofs are used, and for others sloping roofs are used. Light weight roofs consist of trusses and sloping roofs and are thus preferred for factories, godowns, big stadiums etc. where large areas are required to be roofed. Flat roofs help in providing more floor area for use in way of multistoreyed buildings.
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