A roof top is part of a building envelope. It is the covering on the uppermost part of an building or shelter which gives protection from pets or animals and weather, notably rain or snow, but heat also, wind and sunlight. The term denotes the framing or framework which facilitates that covering also.[1]The characteristics of your roof are dependent upon the goal of the building so it includes, the available roof covering materials and the local traditions of structure and wider ideas of architectural design and practice and may also be governed by local or nationwide legislation. In most countries a roof protects mostly against rain. 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 hand branches at Neot Semadar, IsraelA rooftop might provide additional living space, for example a rooftop garden.The elements in the look of a roofing are:the materialthe constructionthe durabilityThe material of a roof may range between banana leaves, wheaten seagrass or straw to laminated cup, copper (see: copper roof covering), aluminium sheeting and pre-cast cement. In lots of elements of the global world ceramic tiles have been the predominant roof covering material for years and years, if not millennia. Other roofing 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 your roof is determined by its method of support and the way the underneath space is bridged and set up roofing is pitched. The pitch is the perspective of which the roof increases from its least expensive to highest point. Most US home architecture, except in very dried parts, has roofs that are sloped, or pitched. Although modern building elements such as drainpipes may take away the dependence on pitch, roofs are pitched for reasons of traditions and appearance. So the pitch is partly dependent upon stylistic factors, and partially regarding practicalities.
Some types of roof covering, for example thatch, require a steep pitch to become durable and waterproof. 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 regions where there is little rain, an almost toned roof with a slight run-off provides enough protection against an occasional downpour. Drainpipes also take away the dependence on a sloping roof structure.
Somebody who specializes in roof top construction is called a roofer.The durability of the roof structure is a subject of concern because the rooftop is usually the least accessible part of the building for purposes of repair and renewal, while its devastation or damage can have serious effects.
Because the reason for a roof covering is to protect people and their property from climatic elements, the insulating properties of a rooftop are a factor in its framework and the choice of roofing material.Some roofing materials, those of natural fibrous material specifically, such as thatch, have excellent insulating properties. For all those that do not, extra insulation is installed under the exterior covering often. 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 high temperature and cold, sound, dirt and grime 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 your tiles and the roof surface, it can reduce heat caused by the sun.Types of insulation are believed or clear plastic sheeting, with a reflective surface sometimes, installed below the tiles or other materials directly; 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 significantly popular, and in some full cases are mandated by local codes. Cool roofs are defined as roofs with both high reflectivity and high thermal emittance.
Poorly covered and ventilated roof covering can suffer from problems like the formation of glaciers dams surrounding the overhanging eaves in winter, causing water from melted snow on top elements of the rooftop to permeate the roofing material. Ice dams arise when heat escapes through the uppermost area of the roof, and the snow at those items melts, refreezing as it drips over the shingles, and collecting by means of ice at the low points. This may cause structural destruction from stress, like the damage of gutter and drainage systems.
Metal Roof Design Plans http://www.docstoc.com/docs/4357994/patioroof
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Sketch of a medium sized steel framed building showing the main
Metal Roof Houses curved steel roof home by Dutch architects
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