Government and Private Tenders: latest roof-work Tenders in Indian Tenders

Wednesday 2 February 2022

latest roof-work Tenders in Indian Tenders

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"latest roof-work Tenders in Indian Tenders"

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what dose roof work means ?

Roofing work means the hoisting, storage, application, and removal of roofing materials and equipment, including related insulation, sheet metal, and vapor barrier work, but not including the construction of the roof deck.

A roof is the top covering of a building, including all materials and constructions necessary to support it on the walls of the building or on uprights, providing protection against rain, snow, sunlight, extremes of temperature, and wind. A roof is part of the building envelope.

The characteristics of a roof are dependent upon the purpose of the building that it covers, 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 national legislation. In most countries a roof protects primarily against rain. 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.

The elements in the design of a roof are:

the material
the construction
the durability

The material of a roof may range from banana leaves, wheaten straw or seagrass to laminated glass, copper (see: copper roofing), aluminium sheeting and pre-cast concrete. In many parts of the world ceramic roof tiles have been the predominant roofing material for centuries, if not millennia. Other roofing materials include asphalt, coal tar pitch, EPDM rubber, Hypalon, polyurethane foam, PVC, slate, Teflon fabric, TPO, and wood shakes and shingles.
The construction of a roof is determined by its method of support and how the underneath space is bridged and whether or not the roof is pitched. The pitch is the angle at which the roof rises from its lowest to highest point. Most US domestic architecture, except in very dry regions, has roofs that are sloped, or pitched. Although modern construction elements such as drainpipes may remove the need for pitch, roofs are pitched for reasons of tradition and aesthetics. So the pitch is partly dependent upon stylistic factors, and partially to do with practicalities.

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Some types of roofing, for example thatch, require a steep pitch in order to be waterproof and durable. Other types of roofing, for example pantiles, are unstable on a steeply pitched roof but provide excellent weather protection at a relatively low angle. In regions where there is little rain, an almost flat roof with a slight run-off provides adequate protection against an occasional downpour. Drainpipes also remove the need for a sloping roof.

A person that specializes in roof construction is called a roofer.
The durability of a roof is a matter of concern because the roof is often the least accessible part of a building for purposes of repair and renewal, while its damage or destruction can have serious effects.

Roofing Work

the covering of buildings and structures with roofing materials. In modern construction the most commonly used roof coverings are those made of roll materials. Coverings made of mastic and piece materials are also used. Roofing work using roll and mastic materials includes vapor insulation of the basic structure by the application of roofing mastics or by cementing one or two layers of roll material (per-gamyn, Ruberoid, glass Ruberoid, or tar paper) to hot or cold mastics; thermal insulation (made of plate, cast, or bulk heat-insulation materials); an intermediate layer; and a roof covering with a protective layer. These operations may be performed at the construction site or at the place of manufacture; in the latter case, all except the uppermost roofing layer are laid out on prefabricated roof structures.

Roof coverings made of roll and mastic materials are applied to smooth, strong concrete, asphalt-concrete, or gypsum-concrete foundations. The material is cemented to the foundation and the layers are glued to one another by bitumen-based and tar-based roofing mastics, depending on the type of impregnation of the roll material used. Roofing mastics are usually prepared at a central location in jet mixers and transported by pumps through piping to the roof. After priming the base, the roll sections are laid out across the slope of the roof (for a roof pitch of up to 15 percent) or along the slope (for a pitch of more than 15 percent). The number of layers of material and the methods of gluing them are determined by the plan. The sections of the roofing carpet are glued in layers in an arrangement of transverse connecting seams 100 mm wide and longitudinal seams 70–100

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mm wide. In the case of roof pitches of up to 10 percent, the cement may be applied and the roll materials laid and glued by roofing machines. A protective roofing layer is applied by sprinkling crushed stone (gravel) or other frost-resistant mineral materials (with a coarseness of 3–15 mm) on a layer of tarred or disinfected bituminous mastic.

Roof coverings made of mastic materials are installed in layers on prime-coated bases by means of pneumatic paint spray guns. The mastic is usually applied in four layers, each with a maximum thickness of 5 mm, after the previous layer has dried. Aluminum paint or crushed stone is used for the protective layer.

The most widely used roof coverings made of piece materials (asbestos-cement sheets and slabs, tile, and roofing iron) are roofs made of corrugated and semicorrugated asbestos-cement laid out on a wooden lathwork or on reinforced-concrete, steel, or wooden beams, with the corrugations arranged along the pitch of the roof. The sheets are fastened to the lathwork with galvanized wood screws and nails and to the beams with hooks; each sheet is overlapped by another for one corrugation and for 200–250 mm by a sheet of the row above it. Roofs made of flat asbestos-cement slabs have more seams than roofs made of corrugated sheets, which necessitates a steeper pitch of the roof.

Tile roofing is installed on roofs with a pitch of 45–60 percent. The tile is laid on a continuous lathwork, beginning with the cornice rows, hooking with a slot from the rear side and attaching by wire to nails fastened to the lathwork. Roofs made of sheet steel have little dead load and comparatively low pitch. However, steel roofs are not usually installed in new buildings because of the high consumption of steel and the high cost of maintenance

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