A roof covering is part of a building envelope. It is the covering on the uppermost part of any building or shelter which provides protection from animals and weather, rain or snow notably, but also heat, sunlight and wind. The word denotes the framing or framework which facilitates that covering also.[1]The characteristics of the roof are based mostly upon the goal of the building that this protects, the available roofing materials and the local traditions of engineering and wider concepts of architectural design and practice and could 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 an garden conservatory protects plants from cold, wind, and rain, but admits light.
Shack made of date palm branches at Neot Semadar, IsraelA roofing may provide additional liveable space, for example a roofing garden.The elements in the look of a roof structure are:the materialthe constructionthe durabilityThe material of the roof may range from banana leaves, wheaten straw or seagrass to laminated a glass, copper (see: copper roofing), aluminium sheeting and pre-cast cement. In many parts of the global world ceramic tiles have been the predominant roof material for centuries, if not millennia. Other roof covering materials include asphalt, coal tar pitch, EPDM rubber, Hypalon, polyurethane foam, PVC, slate, Teflon cloth, TPO, and hardwood shingles and shakes.
The construction of a roof depends upon its method of support and how the underneath space is bridged and whether or not the roof covering is pitched. The pitch is the viewpoint of which the roof rises from its minimum to highest point. Most US local structures, except in very dried up areas, has roofs that are sloped, or pitched. Although modern engineering elements such as drainpipes might take away the dependence on pitch, roofs are pitched for reasons of aesthetics and traditions. So the pitch is dependent after stylistic factors partly, and partially to do with practicalities.
Some types of roof, for example thatch, need a steep pitch in order to be durable and waterproof. Other types of roofing, for example pantiles, are unstable on the steeply pitched roof but provide excellent weather protection at a comparatively low angle. In parts where there is little rainfall, an almost chiseled roof with hook run-off provides satisfactory protection against an intermittent downpour. Drainpipes take away the need for a sloping roof structure also.
A person that specializes in roof top construction is called a roofer.The durability of your roof top is a subject of matter because the roof top 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 purpose of a roof covering is to safeguard people and their property from climatic elements, the insulating properties of a roof are a account in its structure and the decision of roofing material.Some roof covering materials, especially those of natural fibrous material, such as thatch, have excellent insulating properties. For all those that do not, extra insulation is installed under the outside layer often. In developed countries, the majority of dwellings have a ceiling installed under the structural members of the roof. The purpose of a ceiling is to insulate against warmth and cold, noise, dirt and often from the droppings and lice of parrots who frequently choose roofs as nesting places.
Concrete tiles can be used as insulation. When installed giving a space between the tiles and the roofing surface, it can reduce heating caused by the sun.Types of insulation are felt or plastic material sheeting, sometimes with a reflective surface, installed straight below the tiles or other material; 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 are becoming popular progressively, 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 roofing can have problems with problems including the formation of ice dams around the overhanging eaves in winter, causing drinking water from melted snow on higher parts of the roofing to permeate the roofing material. Ice dams occur when high temperature escapes through the uppermost part of the roof, and the snow at those tips melts, refreezing as it drips across the shingles, and collecting by means of ice at the low points. This may lead to structural destruction from stress, like the devastation of gutter and drainage systems.
Roof Truss Facts Classic Truss and Wood Components, Inc.
39; Attic Truss, with a 12/12 pitch and 12quot; overhang. This truss is
Roof Truss Calculator Online http://rip94550.wordpress.com/2012/04/23
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