A roof is part of any building envelope. It is the covering on the uppermost part of any building or shelter which provides protection from pets and weather, rain or snow notably, but heat also, wind and sunlight. The word also denotes the framing or structure which supports that covering.[1]The characteristics of a roof are reliant upon the goal of the building so it covers, the available roof covering materials and the neighborhood traditions of structure and wider principles of architectural design and practice and could also be governed by local or nationwide legislation. In most countries a roof protects mainly against rain. A verandah might be roofed with materials that shields against sunlight but admits the other elements. The roof of your garden conservatory protects plants from cold, wind, and rain, but admits light.
Shack manufactured from date palm branches at Neot Semadar, IsraelA roof covering may provide additional liveable space, for example a roofing garden.The elements in the design of a roof covering are:the materialthe constructionthe durabilityThe material of the roof may range between banana leaves, wheaten seagrass or straw to laminated glass, copper (see: copper roofer), aluminium sheeting and pre-cast cement. In many parts of the global world ceramic tiles have been the predominant roof covering materials for years and years, if not millennia. Other roof materials include asphalt, coal tar pitch, EPDM plastic, Hypalon, polyurethane foam, PVC, slate, Teflon cloth, TPO, and real wood shingles and shakes.
The construction of your roof depends upon its approach to support and the way the underneath space is bridged and set up rooftop is pitched. The pitch is the position at which the roof increases from its minimum to highest point. Most US local structures, except in very dry out 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 aesthetics and custom. So the pitch is partly dependent upon stylistic factors, also to do with practicalities partly.
Some types of roofer, for example thatch, need a steep pitch to become durable and waterproof. Other styles of roofing, for example pantiles, are unstable over a steeply pitched roof but provide excellent weather protection at a relatively low angle. In regions where there is little rainwater, an almost toned roof with a slight run-off provides satisfactory protection against an occasional downpour. Drainpipes take away the need for a sloping roof also.
Somebody who specializes in roofing construction is named a roofer.The durability of the roof covering is a matter of concern because the roof structure is usually the least accessible part of any building for purposes of repair and renewal, while its destruction or devastation can have serious results.
Because the purpose of a rooftop is to safeguard people and their property from climatic elements, the insulating properties of any roof top are a consideration in its composition and the choice of roofing material.Some roof materials, specifically those of natural fibrous material, such as thatch, have excellent insulating properties. For those that do not, extra insulation is installed under the external part often. In developed countries, nearly all dwellings have a ceiling installed under the structural members of the roof. The goal of a roof is to insulate against heat and cold, sound, mud and often from the lice and droppings of wild 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 rooftop surface, it can reduce heating caused by sunlight.Types of insulation are plastic material or believed sheeting, sometimes with a reflective surface, 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 popular significantly, and in some full cases are mandated by local codes. Cool roofs are thought as roofs with both high reflectivity and high thermal emittance.
Poorly insulated and ventilated roofing can suffer from problems like the formation of ice dams surrounding the overhanging eaves in winter, causing normal water from melted snow on top elements of the rooftop to penetrate the roofing materials. Ice dams appear when heating escapes through the uppermost area of the roof, and the snow at those details melts, refreezing as it drips along the shingles, and collecting in the form of ice at the lower points. This can lead to structural harm from stress, including the destruction of drainage and gutter systems.
Reply 2 on: April 14, 2009, 05:48:55 AM »
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