A rooftop is part of an building envelope. It's the covering on the uppermost part of your building or shelter which provides protection from pets and weather, rain or snow notably, but also heat, sunlight and wind. The term also denotes the framing or structure which supports that covering.[1]The characteristics of the roof are dependent upon the goal of the building which it protects, the available roof materials and the local traditions of construction and wider ideas of architectural design and practice and may 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 roof covering might provide additional living space, for example a roofing garden.The elements in the look of a roof covering are:the materialthe constructionthe durabilityThe material of an roof may range from banana leaves, wheaten seagrass or straw to laminated goblet, copper (see: copper roofer), aluminium sheeting and pre-cast concrete. In many parts of the global world ceramic tiles have been the predominant roofer material for years and years, if not millennia. Other roof materials include asphalt, coal tar pitch, EPDM silicone, Hypalon, reboundable foam, PVC, slate, Teflon fabric, TPO, and real wood shakes and shingles.
The construction of any roof is determined by its method of support and the way the underneath space is bridged and whether or not the roof top is pitched. The pitch is the angle of which the roof goes up from its lowest to highest point. Most US local architecture, except in very dried up locations, has roofs that are sloped, or pitched. Although modern development elements such as drainpipes might take away the need for pitch, roofs are pitched for reasons of aesthetics and tradition. So the pitch is dependent upon stylistic factors partly, and partially to do with practicalities.
Some types of roof, for example thatch, need a steep pitch in order to be waterproof and durable. Other styles of roofing, for example pantiles, are unstable on the steeply pitched roof but provide excellent weather protection at a comparatively low angle. In areas where there is little rainfall, an almost even roof with hook run-off provides sufficient protection against an occasional downpour. Drainpipes take away the need for a sloping roof top also.
A person that specializes in rooftop construction is called a roofer.The durability of your roof is a matter of concern because the roof covering is often the least accessible part of any building for purposes of repair and renewal, while its damage or harm can have serious effects.
Because the purpose of a roof is to safeguard people and their possessions from climatic elements, the insulating properties of your roof structure are a awareness in its composition and the choice of roofing materials.Some roof covering materials, specifically those of natural fibrous materials, such as thatch, have excellent insulating properties. For those that do not, extra insulation is often installed under the exterior part. 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 temperature and cold, noise, dirt and frequently from the droppings and lice of parrots who frequently choose roofs as nesting places.
Concrete tiles can be used as insulation. When installed departing a space between the tiles and the roof top surface, it can reduce home heating caused by sunlight.Forms of insulation are thought or cheap sheeting, with a reflective surface sometimes, installed below the tiles or other material straight; 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 are becoming progressively popular, 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 covered and ventilated roofer can suffer from problems such as the formation of glaciers dams across the overhanging eaves in cold weather, causing normal water from melted snow on higher elements of the roof covering to penetrate the roofing material. Ice dams happen when heating escapes through the uppermost part of the roof, and the snow at those true things melts, refreezing as it drips over the shingles, and collecting in the form of ice at the low points. This may lead to structural damage from stress, including the devastation of drainage and gutter systems.
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Reply 2 on: April 14, 2009, 05:48:55 AM »
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