Flat roofs are considered suitable for buildings in plains or in hot regions, where rainfall is moderate, and where snowfall is not there. Flat roofs are equally applicable to buildings of any shape and size.
Curved roofs have top surface curved. Such roofs are provided to give architectural effects. Curved roofs include cylindrical and parabolic shells and shell domes, doubly curved shells such as hyperbolic, paraboloids and hyperboloids of revolution and folded slabs and prismatic shells. Curved roofs are more suitable for public buildings like libraries, theaters, recreation centers etc.
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