A roof is the top covering of a building, including all materials and constructions necessary to support it on the walls of the building or on uprights, providing protection against rain, snow, sunlight, extremes of temperature, and wind. Roof tiles are overlapping tiles designed mainly to keep out precipitation such as rain or snow, and are traditionally made from locally available materials such as clay or slate. Modern materials such as concrete, metal and plastic are also used and some clay tiles have a waterproof glaze.Later tiles have been made from materials such as metal, concrete, and plastic. Roof tiles are designed mainly to keep out rain, and are traditionally made from locally available materials such as terracotta or slate. Roof tiles are `hung` from the framework of a roof by fixing them with nails.
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