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A roof top is part of the building envelope. It is the covering on the uppermost part of the building or shelter which gives protection from pets and weather, notably rain or snow, but also heat, sunlight and wind. The word also denotes the framing or structure which supports that covering.[1]The characteristics of your roof are based mostly upon the purpose of the building that this addresses, the available roofer 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 against rain primarily. A verandah might be roofed with materials that shields against natural light but admits the other elements. The roof of the garden conservatory protects plants from cold, wind, and rain, but admits light.Shack manufactured from date palm branches at Neot Semadar, IsraelA roof might provide additional liveable space, for example a roof top garden.The elements in the look of a roof top are:the materialthe constructionthe durabilityThe material of your roof may range between banana leaves, wheaten seagrass or straw to laminated glass, copper (see: copper roofing), aluminium sheeting and pre-cast concrete. In lots of parts of the world ceramic tiles have been the predominant roof material for years and years, if not millennia. Other roofing materials include asphalt, coal tar pitch, EPDM rubber, Hypalon, polyurethane foam, PVC, slate, Teflon fabric, TPO, and hardwood shakes and shingles.The construction of the roof depends upon its approach to support and how the underneath space is bridged and whether or not the roofing is pitched. The pitch is the viewpoint of which the roof goes up from its least expensive to highest point. Most US domestic architecture, except in very dried locations, has roofs that are sloped, or pitched. Although modern construction elements such as drainpipes may take away the need for pitch, roofs are pitched for reasons of tradition and looks. So the pitch is dependent upon stylistic factors partly, also to do with practicalities partly.Some types of roofing, 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 locations where there is little rainfall, an almost smooth roof with a slight run-off provides adequate protection against an occasional downpour. Drainpipes also take away the need for a sloping roofing.Somebody who specializes in roofing construction is called a roofer.The durability of an roof is a matter of concern because the roof structure is usually the least accessible part of a building for purposes of repair and renewal, while its destruction or damage can have serious effects.Because the reason for a roof is to safeguard people and their possessions from climatic elements, the insulating properties of a roofing are a consideration in its framework and the choice of roofing material.Some roof materials, those of natural fibrous materials particularly, such as thatch, have excellent insulating properties. For all those that do not, extra insulation is installed under the outer level often. 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 wild birds who frequently choose roofs as nesting places.Concrete tiles can be utilized as insulation. When installed giving a space between your tiles and the roof surface, it can reduce heating caused by sunlight.Forms of insulation are clear plastic or noticed sheeting, with a reflective surface sometimes, installed straight below the tiles or other materials; 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 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 protected and ventilated roofer can suffer from problems including the formation of ice dams surrounding the overhanging eaves in winter, causing normal water from melted snow on higher parts of the roof covering to penetrate the roofing material. Ice dams take place when heating escapes through the uppermost part of the roof, and the snow at those factors melts, refreezing as it drips over the shingles, and collecting by means of ice at the low points. This can lead to structural destruction from stress, including the damage of drainage and gutter systems.

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