A roof covering is part of your 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 also heat, sunlight and wind. The term denotes the framing or framework which facilitates that covering also.[1]The characteristics of your roof are reliant upon the goal of the building it addresses, the available roofing materials and the local traditions of building and wider concepts of architectural design and practice and could also be governed by local or nationwide legislation. In most countries a roof protects against rain primarily. 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 manufactured from date palm branches at Neot Semadar, IsraelA roofing may also provide additional liveable space, for example a roof covering garden.The elements in the design 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 covering), aluminium sheeting and pre-cast cement. In many parts of the globe ceramic tiles have been the predominant roof covering material for centuries, if not millennia. Other roofer materials include asphalt, coal tar pitch, EPDM silicone, Hypalon, polyurethane foam, PVC, slate, Teflon cloth, TPO, and solid wood shingles and shakes.
The construction of an roof depends upon its method of support and how the underneath space is bridged and whether or not the roof structure is pitched. The pitch is the position of which the roof rises from its least expensive to highest point. Most US home structures, except in very dry areas, has roofs that are sloped, or pitched. Although modern development elements such as drainpipes may take away the dependence on pitch, roofs are pitched for reasons of custom and appearance. So the pitch is dependent upon stylistic factors partly, and partially to do with practicalities.
Some types of roofer, for example thatch, require a steep pitch in order to be waterproof and durable. Other styles of roofing, for example pantiles, are unstable on a steeply pitched roof but provide excellent weather protection at a relatively low angle. In locations where there is little rain, an almost flat roof with a slight run-off provides enough protection against an intermittent downpour. Drainpipes also take away the dependence on a sloping roof.
A person that specializes in rooftop construction is called a roofer.The durability of the roof is a subject of concern because the roofing is usually the least accessible part of any building for purposes of repair and renewal, while its destruction or damage can have serious effects.
Because the reason for a rooftop is to safeguard people and their belongings from climatic elements, the insulating properties of your roof structure are a consideration in its composition and the decision of roofing material.Some roof materials, specifically those of natural fibrous materials, such as thatch, have excellent insulating properties. For those that do not, extra insulation is installed under the outer coating often. In developed countries, the majority of dwellings have a ceiling installed under the structural members of the roof. The goal of a roof is to insulate against heating and cold, noise, dirt and frequently from the lice and droppings of wild birds 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 home heating caused by sunlight.Forms of insulation are experienced or clear plastic 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 have become popular more and more, 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 covered and ventilated roofer can suffer from problems including the formation of snow dams around the overhanging eaves in winter, causing normal water from melted snow on higher parts of the rooftop to permeate the roofing materials. Ice dams take place when heating escapes through the uppermost part of the roof, and the snow at those true items melts, refreezing as it drips over the shingles, and collecting in the form of ice at the low points. This may lead to structural harm from stress, like the destruction of drainage and gutter systems.
FIGURE 2.13 ROOF LOAD WIDTH RLW—NONCOUPLED ROOFS Images Frompo
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