A roofer, roofing mechanic, or roofing contractor is a merchant who specializes in building roofs. Roofers replace, repair and install. Roofers replace, repair, and install building roofs, using a variety of materials, including shingles, bitumen, and metal. Roofing work can be physically demanding because it involves lifting heavy objects, as well as climbing, crouching and kneeling, often in extreme weather conditions.
Curly or rotten shingles, lack of shingles, and blisters are signs that the roof needs care. Roof, which covers the top of a building, serves to protect against rain, snow, sunlight, wind and extreme temperatures. Roofs have been constructed in a wide variety of flat, sloped, vaulted, vaulted shapes, or in combinations as dictated by technical, economic, or aesthetic considerations. A roof is a structure that forms the upper deck of a building or other shelter.
Its main purpose is generally to provide protection from the elements, but it can also contribute to security, privacy, isolation, etc. Flat roofs are usually covered with felt and tar, while pitched roofs are usually covered with shingles or sheet metal. When installed by leaving a gap between the shingles and the roof surface, it can reduce the heat caused by the sun. For this reason, most buildings have a system to protect the walls of a building from most of the roof water.
Some types of roofs, for example, the thatched roof, require a steep slope to be waterproof and durable. However, when building a roof, it is important to understand that in order to calculate most of the beam lengths, a 90° right-angle triangle is needed. Roofs made of mown grass (modern ones known as green roofs, traditional ones such as grass roofs) have good insulating properties and are increasingly being encouraged as a way to green the Earth. The supporting structure of a roof generally comprises beams that are long and of strong and quite rigid material, such as wood, and since the middle of the 19th century, cast iron or steel.
The biggest concern with this method is that the weight of the additional material could exceed the dead load capacity of the roof structure and cause collapse. Ice dams occur when heat escapes through the highest part of the roof and snow at those points melts, freezes again as it drips along the shingles and accumulates in the form of ice at the lowest points. With continuous improvements to the steel beams, they became the main structural support for large roofs and, eventually, also for ordinary houses. Common beams are the main timbers used to build a gable roof and are also found in almost all hipped roof construction.
Steel and reinforced concrete have largely replaced these heavy wooden support systems and, in addition, these materials have allowed the development of new and spectacular roof shapes. Lead, which is sometimes used for church roofs, was most commonly used as flashings in valleys and around chimneys on domestic roofs, particularly slate roofs. One group consists of a waterproof membrane or film that is applied as a liquid and which repels water for total impermeability after it has dried; tar used to coat roofing felt is the best example of this type. Areas prone to heavy snowfall benefit from a metal roof because their smooth surfaces remove the weight of snow more easily and better withstand the force of wind than a wooden tile or concrete tile roof.