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Concrete roofing is composed of concrete reinforced with fibers of some sort. Structural concrete can also be used for flat roof constructions. There are three main categories, precast/prestressed, cast-in-place and shell. There are many types of precast/prestressed concrete roofing. The following are the most common types. [8]
Shaped like a “U” or channel to catch water (e.g., where the edge of a tile roof meets a wall). Through wall flashing Spans the thickness of the wall and directs water to weep holes. Cap flashing (drip cap) Often used above windows and doors. Drip edge A metal used at the edges of a roof. Step flashing (soaker, base flashing)
A roof must be designed with a suitable fall to allow the rainwater to discharge. The water drains into a gutter that is fed into a downpipe. A flat roof should have a watertight surface with a minimum finished fall of 1 in 80. They can drain internally or to an eaves gutter, which has a minimum 1 in 360 fall towards the downpipe.
A water/air resistant membrane is placed between the furring and the sheathing to prevent rain water from entering the wall structure. The membrane directs water away and toward special drip edge flashings which protect other parts of the building. Insulation may be provided beneath the membrane. The thickness of insulation is determined by ...
A flat roof is a roof which is almost level in contrast to the many types of sloped roofs. The slope of a roof is properly known as its pitch and flat roofs have up to approximately 10°. [ 1 ] Flat roofs are an ancient form mostly used in arid climates and allow the roof space to be used as a living space or a living roof .
On the roof, Bruce Killen reviews the progress the new wood shingle roof and the ingredients that go into a roof designed to last 50 years, even in the harsh island environment: heavy roof sheathing, tarpaper, bitumen membrane along edges and in valleys, copper valleys and drip edge, a three-dimensional mesh that allows a layer of air beneath ...
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