A roof covering is part of your building envelope. It is the covering on the uppermost part of your building or shelter which provides protection from family pets and weather, notably rain or snow, but also heat, sunlight and wind. The term 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 so it 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 mostly against rain. A verandah might be roofed with materials that protects against natural 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 roof structure may provide additional liveable space, for example a roof garden.The elements in the look of a roofing are:the materialthe constructionthe durabilityThe material of your roof may range from banana leaves, wheaten seagrass or straw to laminated goblet, copper (see: copper roof), aluminium sheeting and pre-cast concrete. In many elements 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 plastic, Hypalon, reboundable foam, PVC, slate, Teflon cloth, TPO, and wood shakes and shingles.
The construction of a roof depends upon its approach to support and the way the underneath space is bridged and whether or not the roof is pitched. The pitch is the position of which the roof increases from its least expensive to highest point. Most US home structures, except in very dry out parts, has roofs that are sloped, or pitched. Although modern building elements such as drainpipes might take away the dependence on pitch, roofs are pitched for reasons of tradition and looks. So the pitch is dependent after stylistic factors partly, and to do with practicalities partially.
Some types of roof, for example thatch, need a steep pitch to become waterproof and durable. 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 areas where there is little rain, an almost level roof with hook run-off provides satisfactory protection against an intermittent downpour. Drainpipes also remove the dependence on a sloping roof.
A person that specializes in roof construction is called a roofer.The durability of your roofing is a matter of concern because the roof structure is often the least accessible part of an building for purposes of repair and renewal, while its damage or destruction can have serious results.
Because the purpose of a roof is to safeguard people and their possessions from climatic elements, the insulating properties of a roof top are a concern in its composition and the decision of roofing materials.Some roof covering materials, specifically those of natural fibrous material, such as thatch, have excellent insulating properties. For those that not, extra insulation is installed under the exterior part 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 heating 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 your tiles and the rooftop surface, it can reduce heating system caused by sunlight.Forms of insulation are plastic material or noticed sheeting, with a reflective surface sometimes, 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 are becoming more and more popular, and occasionally 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 have problems with problems like the formation of snow dams about the overhanging eaves in cold weather, causing drinking water from melted snow on higher parts of the roof covering to penetrate the roofing materials. Ice dams arise when warmth escapes through the uppermost area 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 can cause structural damage from stress, including the damage of drainage and gutter systems.
Last edited by NorthwoodsMike; 02/03/14 at 12:27 PM .Reason: added pic
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39; Attic Truss, with a 12/12 pitch and 12quot; overhang. This truss is
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