cca2013fallcpm [licensed for noncommercial use only] / Shan Sanby Yu

A roof top is part of the building envelope. It is the covering on the uppermost part of any building or shelter which gives protection from pets or animals and weather, notably rain or snow, but also heat, wind and sunlight. The word also denotes the framing or structure which supports that covering.[1]The characteristics of your roof are dependent upon the purpose of the building so it covers, the available roofer materials and the neighborhood traditions of development and wider concepts of architectural design and practice and may 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 any garden conservatory protects plants from cold, wind, and rain, but admits light.Shack made of date palm branches at Neot Semadar, IsraelA roof top may provide additional liveable space, for example a roof structure garden.The elements in the design of a roofing are:the materialthe constructionthe durabilityThe material of a roof may range from banana leaves, wheaten straw or seagrass to laminated wine glass, copper (see: copper roof covering), aluminium sheeting and pre-cast cement. In lots of elements of the global world ceramic tiles have been the predominant roof covering material for years and years, if not millennia. Other roofer materials include asphalt, coal tar pitch, EPDM plastic, Hypalon, polyurethane foam, PVC, slate, Teflon textile, TPO, and hardwood shingles and shakes.The construction of a roof depends upon its approach to support and how the underneath space is bridged and set up rooftop is pitched. The pitch is the perspective at which the roof rises from its lowest to highest point. Most US local architecture, except in very dried out locations, has roofs that are sloped, or pitched. Although modern engineering elements such as drainpipes might remove the dependence on pitch, roofs are pitched for reasons of custom and appearance. So the pitch is partly dependent upon stylistic factors, also to do with practicalities partially.Some types of roof, for example thatch, require a steep pitch in order to be durable and waterproof. Other styles of roofing, for example pantiles, are unstable on the steeply pitched roof but provide excellent weather protection at a comparatively low angle. In areas where there is little rainwater, an almost flat roof with a slight run-off provides sufficient protection against an intermittent downpour. Drainpipes take away the dependence on a sloping roof covering also.Somebody who specializes in roofing construction is named a roofer.The durability of a roof top is a subject of concern because the roof structure is often the least accessible part of the building for purposes of repair and renewal, while its devastation or damage can have serious effects.Because the reason for a rooftop is to protect people and their belongings from climatic elements, the insulating properties of any roof top are a thought in its framework and the decision of roofing material.Some roof materials, those of natural fibrous materials especially, such as thatch, have excellent insulating properties. For all those that do not, extra insulation is often installed under the outer level. In developed countries, the majority of dwellings have a ceiling installed under the structural members of the roof. The goal of a ceiling is to insulate against high temperature and cold, sound, dirt and grime and often from the lice and droppings of birds who frequently choose roofs as nesting places.Cement tiles can be used as insulation. When installed giving a space between the tiles and the rooftop surface, it can reduce heat caused by the sun.Types of insulation are plastic or believed sheeting, with a reflective surface sometimes, installed below the tiles or other material 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 more and more 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 protected and ventilated roofer can suffer from problems including the formation of glaciers dams surrounding the overhanging eaves in cold weather, causing drinking water from melted snow on top elements of the roofing to penetrate the roofing materials. Ice dams arise when heat escapes through the uppermost area of the roof, and the snow at those true things melts, refreezing as it drips across the shingles, and collecting in the form of ice at the low points. This can result in structural damage from stress, like the damage of drainage and gutter systems.

For comparison, here’s the Pratt truss I used in the previous post.

Shed Roof Design Loads shed plans free material list

For comparison, here’s the Pratt truss I used in the previous post.

predominant industry standard method for building roofs. Usually, roof

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