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A roof top is part of an building envelope. It's the covering on the uppermost part of any building or shelter which provides protection from pets and weather, notably rain or snow, but also heat, wind and sunlight. The word also denotes the framing or structure which supports that covering.[1]The characteristics of the roof are dependent upon the goal of the building it covers, the available roof covering materials and the local traditions of construction and wider concepts of architectural design and practice and may also be governed by local or national legislation. In most countries a roof protects against rain primarily. A verandah might be roofed with materials that defends against natural light but admits the other elements. The roof of a garden conservatory protects plants from cold, wind, and rain, but admits light.Shack made of date hand branches at Neot Semadar, IsraelA roof structure may provide additional living space, for example a roof structure garden.The elements in the look of a roof covering are:the materialthe constructionthe durabilityThe material of your roof may range between banana leaves, wheaten straw or seagrass to laminated wine glass, copper (see: copper roof), aluminium sheeting and pre-cast cement. In many parts of the global world ceramic tiles have been the predominant roof covering material for years and years, if not millennia. Other roof covering materials include asphalt, coal tar pitch, EPDM silicone, Hypalon, polyurethane foam, PVC, slate, Teflon cloth, TPO, and real wood shingles and shakes.The construction of an roof is determined by its approach to support and how the underneath space is bridged and set up roof is pitched. The pitch is the viewpoint of which the roof goes up from its minimum to highest point. Most US home structures, except in very dry areas, has roofs that are sloped, or pitched. Although modern engineering elements such as drainpipes may remove the need for pitch, roofs are pitched for reasons of traditions and looks. So the pitch is partly dependent upon stylistic factors, and partially regarding practicalities.Some types of roofing, 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 rain, an almost chiseled roof with hook run-off provides satisfactory protection against an intermittent downpour. Drainpipes also remove the need for a sloping roof.Somebody who specializes in roof top construction is called a roofer.The durability of any roof structure is a matter of matter because the roof is usually the least accessible part of your building for purposes of repair and renewal, while its destruction or destruction can have serious results.Because the reason for a roofing is to protect people and their belongings from climatic elements, the insulating properties of any roof top are a account in its framework and the choice of roofing material.Some roof materials, particularly those of natural fibrous materials, such as thatch, have excellent insulating properties. For all those that do not, extra insulation is often installed under the outside level. In developed countries, the majority of dwellings have a ceiling installed under the structural members of the roof. The purpose of a roof is to insulate against temperature and cold, noise, dirt and often from the lice and droppings of birds who frequently choose roofs as nesting places.Concrete tiles can be utilized as insulation. When installed going out of a space between the tiles and the roofing surface, it can reduce heating up caused by the sun.Types of insulation are felt or plastic material sheeting, with a reflective surface sometimes, installed below the tiles or other materials immediately; synthetic foam batting laid above the ceiling and recycled paper products and other such materials that may be inserted or sprayed into roof cavities. So called Cool roofs have become increasingly popular, and in some instances are mandated by local codes. Cool roofs are thought as roofs with both high reflectivity and high thermal emittance.Poorly insulated and ventilated roof can have problems with problems including the formation of glaciers dams throughout the overhanging eaves in cold weather, causing normal water from melted snow on upper elements of the rooftop to permeate the roofing materials. Ice dams happen when heat escapes through the uppermost area of the roof, and the snow at those details melts, refreezing as it drips across the shingles, and collecting by means of ice at the low points. This may bring about structural harm from stress, like the destruction of drainage and gutter systems.

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