Roofs may be grouped under two major categories, viz., sloping or pitched roofs and flat roofs.
Slope or pitched roofs are those which have the surfaces with considerable slope for covering the building structure. The modern construction like shells may also be grouped under this category.
A roof which is nearly flat is known as a flat roof. It is the convention if the slope is less than 10°, it is considered as a flat roof. As a matter of fact no roof is laid flat.
Further discussion is made on different types of roofs in each category.
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