A roofing is part of the building envelope. It is the covering on the uppermost part of the building or shelter which gives protection from animals and weather, notably rain or snow, but heat also, wind and sunlight. The term also denotes the framing or structure which supports that covering.[1]The characteristics of an roof are based mostly upon the goal of the building it protects, the available roof covering materials and the local traditions of structure 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 might be roofed with materials that protects against sun 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 roofing could also provide additional living space, for example a roof covering garden.The elements in the look of a roofing are:the materialthe constructionthe durabilityThe material of your roof may range between banana leaves, wheaten seagrass or straw to laminated glass, copper (see: copper roof), aluminium sheeting and pre-cast cement. In many parts of the planet ceramic tiles have been the predominant roofing materials for years and years, if not millennia. Other roof covering materials include asphalt, coal tar pitch, EPDM plastic, Hypalon, polyurethane foam, PVC, slate, Teflon cloth, TPO, and hardwood shingles and shakes.
The construction of an roof is determined by its approach to support and the way the underneath space is bridged and whether or not the roof is pitched. The pitch is the angle at which the roof rises from its lowest to highest point. Most US local structures, except in very dry parts, has roofs that are sloped, or pitched. Although modern building elements such as drainpipes might remove the dependence on pitch, roofs are pitched for reasons of custom and looks. So the pitch is dependent after stylistic factors partly, and partially regarding practicalities.
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 over a steeply pitched roof but provide excellent weather protection at a comparatively low angle. In parts where there is little rainwater, an almost level roof with hook run-off provides adequate protection against an occasional downpour. Drainpipes take away the dependence on a sloping roofing also.
Somebody who specializes in roof structure construction is called a roofer.The durability of any roof top is a subject of matter because the roofing is usually the least accessible part of a building for purposes of repair and renewal, while its damage or devastation can have serious results.
Because the reason for a roof is to safeguard people and their belongings from climatic elements, the insulating properties of the roof covering are a concern in its structure and the decision of roofing materials.Some roof materials, those of natural fibrous materials especially, such as thatch, have excellent insulating properties. For those that do not, extra insulation is often installed under the outer coating. In developed countries, nearly all dwellings have a ceiling installed under the structural members of the roof. The purpose of a roof is to insulate against heat and cold, sound, dirt and grime and frequently from the lice and droppings of parrots who frequently choose roofs as nesting places.
Cement tiles can be utilized as insulation. When installed giving a space between your tiles and the roof covering surface, it can reduce heat caused by sunlight.Types of insulation are plastic material or experienced 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 more and more 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 insulated and ventilated roof can suffer from problems like the formation of glaciers dams about the overhanging eaves in winter, causing water from melted snow on upper parts of the roofing to penetrate the roofing material. Ice dams occur when high temperature escapes through the uppermost part 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 lower points. This may bring about structural destruction from stress, like the damage of gutter and drainage systems.
Retrofitting existing buildings with green roofs Sustainable
us roof and building data ground snow load p g psf 5 psf 300 psf roof
wood roof truss design loads Quotes
wood roof truss design loads Quotes
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