20 Jul Flat roof
A flat roof is a type of covering for a building. In contrast to the more sloped form of roof, a flat roof is horizontal or nearly horizontal. The slope of a roof is properly known as its pitch: Roofs which are nearly flat are known as low-pitch roofs (as the angle of slope increases, so the pitch is said to increase). Any sheet of material used to cover a flat or low-pitched roof is usually known as a membrane and the primary purpose of these membranes is to waterproof the roof area.