A rooftop is part of the building envelope. It is the covering on the uppermost part of a building or shelter which provides protection from pets and weather, notably rain or snow, but also heat, sunlight and wind. The term also denotes the framing or structure which supports that covering.[1]The characteristics of any roof are reliant upon the purpose of the building which it addresses, the available roofing materials and the neighborhood traditions of construction and wider ideas 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 material that shields against sun light but admits the other elements. The roof of the 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 also provide additional liveable space, for example a roof top garden.The elements in the design of a roof covering are:the materialthe constructionthe durabilityThe material of a roof may range from banana leaves, wheaten straw or seagrass to laminated glass, copper (see: copper roofer), aluminium sheeting and pre-cast cement. In lots of parts of the globe ceramic tiles have been the predominant roof material for centuries, if not millennia. Other roof materials include asphalt, coal tar pitch, EPDM plastic, Hypalon, polyurethane foam, PVC, slate, Teflon fabric, TPO, and solid wood 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 roof structure is pitched. The pitch is the position of which the roof increases from its lowest to highest point. Most US local structures, except in very dried up areas, has roofs that are sloped, or pitched. Although modern structure elements such as drainpipes may remove the dependence on pitch, roofs are pitched for reasons of traditions and appearance. So the pitch is partly dependent upon stylistic factors, and partially to do with practicalities.Some types of roof, 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 comparatively low angle. In locations where there is little rainfall, an almost even roof with a slight run-off provides enough protection against an intermittent downpour. Drainpipes also remove the dependence on a sloping roofing.Somebody who specializes in roof top construction is named a roofer.The durability of a roof structure is a subject of matter because the roof is usually the least accessible part of an building for purposes of repair and renewal, while its damage or destruction can have serious results.Because the reason for a roof is to safeguard people and their belongings from climatic elements, the insulating properties of your roof are a concern in its framework and the decision of roofing material.Some roofing materials, specifically those of natural fibrous materials, such as thatch, have excellent insulating properties. For all 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 purpose of a roof is to insulate against heat and cold, noises, dirt and often from the lice and droppings 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 rooftop surface, it can reduce heating up caused by sunlight.Forms of insulation are felt or cheap sheeting, sometimes with a reflective surface, installed below the tiles or other materials directly; 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 increasingly popular, 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 suffer from problems like the formation of snow dams surrounding the overhanging eaves in winter, causing drinking water from melted snow on upper elements of the rooftop to permeate the roofing materials. Ice dams take place when temperature escapes through the uppermost area of the roof, and the snow at those true details melts, refreezing as it drips across the shingles, and collecting by means of ice at the lower points. This may cause structural damage from stress, like the damage of drainage and gutter systems. Thanks for reading and visit our blog, don't forget to share this content.