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A rooftop is part of a building envelope. It's the covering on the uppermost part of your building or shelter which provides protection from pets or animals and weather, notably rain or snow, but heat also, sunlight and wind. The word also denotes the framing or structure which supports that covering.[1]The characteristics of your roof are based mostly upon the purpose of the building that it covers, the available roofing materials and the local traditions of development and wider ideas of architectural design and practice and could also be governed by local or national legislation. In most countries a roof protects primarily against rain. A verandah may be roofed with material that protects against sunlight but admits the other elements. The roof of your garden conservatory protects plants from cold, wind, and rain, but admits light.Shack manufactured from date palm branches at Neot Semadar, IsraelA rooftop may also provide additional living space, for example a rooftop garden.The elements in the look of a rooftop are:the materialthe constructionthe durabilityThe material of any roof may range from banana leaves, wheaten straw or seagrass to laminated wine glass, copper (see: copper roofing), aluminium sheeting and pre-cast concrete. In lots of parts of the global world ceramic tiles have been the predominant roofing materials for centuries, if not millennia. Other roofing materials include asphalt, coal tar pitch, EPDM plastic, Hypalon, polyurethane foam, PVC, slate, Teflon textile, TPO, and hardwood shingles and shakes.The construction of your roof is determined by its approach to support and the way the underneath space is bridged and set up roof is pitched. The pitch is the angle at which the roof increases from its lowest to highest point. Most US domestic structures, except in very dry locations, has roofs that are sloped, or pitched. Although modern development elements such as drainpipes might remove the need for pitch, roofs are pitched for reasons of custom and aesthetics. So the pitch is dependent upon stylistic factors partly, also to do with practicalities partly.Some types of roof, for example thatch, require a steep pitch in order to be waterproof and durable. Other types of roofing, for example pantiles, are unstable on a steeply pitched roof but provide excellent weather protection at a relatively low angle. In locations where there is little rainwater, an almost smooth roof with hook run-off provides enough protection against an occasional downpour. Drainpipes take away the dependence on a sloping roof top also.A person that specializes in roof structure construction is called a roofer.The durability of your roof is a subject of concern because the roof top is often the least accessible part of any building for purposes of repair and renewal, while its devastation or harm can have serious effects.Because the purpose of a rooftop is to safeguard people and their possessions from climatic elements, the insulating properties of your roofing are a awareness in its composition and the choice of roofing materials.Some roofer materials, those of natural fibrous materials especially, such as thatch, have excellent insulating properties. For all those that do not, extra insulation is installed under the outer coating often. In developed countries, nearly all dwellings have a ceiling installed under the structural members of the roof. The purpose of a ceiling is to insulate against heating and cold, sound, mud and often from the droppings and lice of wild birds who frequently choose roofs as nesting places.Concrete tiles can be utilized as insulation. When installed departing a space between your tiles and the roof covering surface, it can reduce heating system caused by sunlight.Types of insulation are felt or cheap sheeting, sometimes with a reflective surface, installed below the tiles or other materials immediately; synthetic foam batting laid above the ceiling and recycled paper products and other such materials that can be inserted or sprayed into roof cavities. So called Cool roofs are becoming ever more popular, and in some cases are mandated by local codes. Cool roofs are thought as roofs with both high reflectivity and high thermal emittance.Poorly covered and ventilated roofer can suffer from problems like the formation of snow dams across the overhanging eaves in cold weather, causing normal water from melted snow on top parts of the roofing to permeate the roofing material. Ice dams take place when heat escapes through the uppermost part of the roof, and the snow at those true tips melts, refreezing as it drips over the shingles, and collecting by means of ice at the low points. This may result in structural destruction from stress, including the destruction of drainage and gutter systems.

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