A roof top is part of the building envelope. It is the covering on the uppermost part of an building or shelter which gives protection from animals and weather, rain or snow notably, but also heat, sunlight and wind. The word denotes the framing or composition which helps that covering also.[1]The characteristics of any roof are based mostly upon the purpose of the building that this includes, the available roofing materials and the local traditions of construction and wider concepts of architectural design and practice and may also be governed by local or countrywide legislation. In most countries a roof protects primarily against rain. A verandah might be roofed with materials that defends against sunlight but admits the other elements. The roof of any 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 liveable space, for example a rooftop garden.The elements in the look of a roof top are:the materialthe constructionthe durabilityThe material of the roof may range between banana leaves, wheaten seagrass or straw to laminated glass, copper (see: copper roofing), aluminium sheeting and pre-cast cement. In lots of parts of the global world ceramic tiles have been the predominant roof covering materials for centuries, if not millennia. Other roofer materials include asphalt, coal tar pitch, EPDM plastic, Hypalon, polyurethane foam, PVC, slate, Teflon fabric, TPO, and lumber shingles and shakes.
The construction of an roof is determined by its approach to support and how the underneath space is bridged and whether or not the rooftop is pitched. The pitch is the position at which the roof rises from its most affordable to highest point. Most US home structures, except in very dry out areas, has roofs that are sloped, or pitched. Although modern structure elements such as drainpipes might take away the need for pitch, roofs are pitched for reasons of appearance and traditions. So the pitch is dependent upon stylistic factors partly, also to do with practicalities partially.
Some types of roof covering, for example thatch, require a steep pitch in order to be waterproof and durable. Other types of roofing, for example pantiles, are unstable over a steeply pitched roof but provide excellent weather protection at a relatively low angle. In parts where there is little rainfall, an almost toned roof with hook run-off provides adequate protection against an occasional downpour. Drainpipes remove the need for a sloping roof top also.
Somebody who specializes in rooftop construction is named a roofer.The durability of a roof structure is a matter of matter because the roof covering is usually the least accessible part of a building for purposes of repair and renewal, while its damage or damage can have serious results.
Because the reason for a roof structure is to protect people and their belongings from climatic elements, the insulating properties of your rooftop are a factor in its composition and the choice of roofing material.Some roofer materials, those of natural fibrous materials specifically, such as thatch, have excellent insulating properties. For those that not, extra insulation is installed under the external covering often. In developed countries, nearly all dwellings have a ceiling installed under the structural members of the roof. The goal of a ceiling is to insulate against temperature and cold, sound, mud and frequently from the lice and droppings of birds 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 surface, it can reduce home heating caused by the sun.Types of insulation are believed or cheap sheeting, sometimes with a reflective surface, installed below the tiles or other material 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 have become progressively more popular, and in some cases are mandated by local codes. Cool roofs are defined as roofs with both high reflectivity and high thermal emittance.
Poorly insulated and ventilated roofing can have problems with problems like the formation of ice dams about the overhanging eaves in winter, causing water from melted snow on higher elements of the rooftop to penetrate the roofing materials. Ice dams arise when warmth escapes through the uppermost area of the roof, and the snow at those factors melts, refreezing as it drips along 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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Reply 2 on: April 14, 2009, 05:48:55 AM »
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