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Other materials included leather and canvas. Some coverings replicated the appearance of a movable top, similar to those on horse carriages, along with landau bars. [2] The use of vinyl to cover the roofs of regular automobiles was to "give fixed-roof cars some of the flair and appeal of their convertible counterparts."
Flat roofs may also need to be designed for live loads if people can walk on them. In the United States, building codes specify the loads in pounds per square foot which vary by region. The load and span (distance between supports) defines the size and spacing of the rafters and trusses.
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. Materials that cover flat roofs typically allow the water to run off from a slight inclination or camber into a gutter system. Water from some flat roofs such as on garden sheds ...
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]
In construction, covering is the exterior layer of a building's roof. The covering ensures waterproofing by directing and collecting rainwater . It also provides mechanical protection against various external elements such as dust and intrusions.
Solar systems can be integrated with roofs by: integration in the covering of pitched roofs, e.g. solar shingles, mounting on an existing roof, e.g. solar panel on a tile roof, integration in a flat roof membrane using heat welding (e.g. PVC) or mounting on a flat roof with a construction and additional weight to prevent uplift from wind.
The underlayment also sheds any water which penetrates the roof covering from an ordinary leak, a leak from wind-driven rain or snow, wind damage to the roof covering, or ice dams. However, the application of underlays may increase the roof temperature, which is the leading cause of ageing of asphalt shingles. Not installing an underlay may ...
The word comes ultimately from the Italian parapetto (parare 'to cover/defend' and petto 'chest/breast'). Where extending above a roof, a parapet may simply be the portion of an exterior wall that continues above the edge line of the roof surface, or may be a continuation of a vertical feature beneath the roof such as a fire wall or party wall. [2]
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