A roof top is part of a building envelope. It is the covering on the uppermost part of the building or shelter which gives protection from family pets and weather, notably rain or snow, but also heat, wind and sunlight. The term also denotes the framing or structure which supports that covering.[1]The characteristics of your roof are centered upon the purpose of the building that it addresses, the available roofing materials and the neighborhood traditions of building and wider principles of architectural design and practice and could also be governed by local or countrywide legislation. In most countries a roof protects against rain primarily. A verandah may be roofed with material that protects against sunlight 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 palm branches at Neot Semadar, IsraelA rooftop could also provide additional liveable space, for example a rooftop garden.The elements in the design of a rooftop are:the materialthe constructionthe durabilityThe material of your roof may range between banana leaves, wheaten straw or seagrass to laminated glass, copper (see: copper roof covering), aluminium sheeting and pre-cast concrete. In many elements of the global world ceramic tiles have been the predominant roof material for years and years, if not millennia. Other roof materials include asphalt, coal tar pitch, EPDM rubber, Hypalon, reboundable foam, PVC, slate, Teflon fabric, TPO, and real wood shingles and shakes.
The construction of the roof is determined by its method of support and how the underneath space is bridged and set up roof covering is pitched. The pitch is the angle at which the roof goes up from its least expensive to highest point. Most US local structures, except in very dried areas, has roofs that are sloped, or pitched. Although modern structure elements such as drainpipes might take away the dependence on pitch, roofs are pitched for reasons of traditions and looks. So the pitch is dependent upon stylistic factors partly, and to do with practicalities partly.
Some types of roof covering, for example thatch, require a steep pitch to become waterproof and durable. Other types of roofing, for example pantiles, are unstable on the steeply pitched roof but provide excellent weather protection at a relatively low angle. In locations where there is little rain, an almost level roof with a slight run-off provides adequate protection against an intermittent downpour. Drainpipes also take away the dependence on a sloping roof covering.
Somebody who specializes in roof construction is called a roofer.The durability of any roof covering is a matter of concern because the roofing is usually the least accessible part of your building for purposes of repair and renewal, while its devastation or destruction can have serious results.
Because the purpose of a roof is to protect people and their property from climatic elements, the insulating properties of an rooftop are a consideration in its structure and the choice of roofing materials.Some roofing materials, specifically those of natural fibrous material, such as thatch, have excellent insulating properties. For those that not, extra insulation is installed under the external part often. In developed countries, nearly all dwellings have a ceiling installed under the structural members of the roof. The goal of a roof is to insulate against heating and cold, noises, dirt and grime and often from the lice and droppings of parrots who frequently choose roofs as nesting places.
Concrete tiles can be used as insulation. When installed going out of a space between your tiles and the roof structure surface, it can reduce warming caused by sunlight.Types of insulation are vinyl or noticed 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 may be inserted or sprayed into roof cavities. So called Cool roofs have become popular ever more, and in some full cases are mandated by local codes. Cool roofs are thought as roofs with both high reflectivity and high thermal emittance.
Poorly insulated and ventilated roofer can suffer from problems including the formation of snow dams round the overhanging eaves in winter, causing drinking water from melted snow on top elements of the roof top to penetrate the roofing material. Ice dams happen when high temperature escapes through the uppermost part of the roof, and the snow at those items melts, refreezing as it drips across the shingles, and collecting by means of ice at the lower points. This may result in structural destruction from stress, including the damage of gutter and drainage systems.
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Reply 2 on: April 14, 2009, 05:48:55 AM »
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