Pre engineered buildings are those fully or partially constructed within their manufacturing factory or facility, usually through the use of an assembly line. These prefabricated buildings or modular buildings are long term temporary, relatively cost-effective and also quick and easy to assemble on site. They are designed by engineers to be manufactured with a specific inventory list of available materials and construction techniques.
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While structural and aesthetic specifications can be met, pre engineered buildings are usually fairly standard. The standard structure of prefabricated buildings and structures is also the most cost effective option for building. Indoor modular offices and storage buildings, as well as outdoor sheds, garages, shelters and booths can all be pre engineered and fabricated in factories away from their intended locations. Portable and relocatable buildings are then transported either completely assembled, or in pieces to be assembled on site. This type of building is also used for disaster relief applications such as for housing, medical centers and shelters for victims of floods, hurricanes, fires and other natural disasters. Mobile homes may also be considered pre engineered buildings as they aren't assembled on site like conventional housing.
Distinguishing many pre engineered buildings from conventional buildings may be tricky because they often use the same building materials and dimensions. Prefabricated buildings can also be finished in a variety of ways to look like the buildings they are adjacent to, or attached to. Steel is commonly used for the frame of modular offices and buildings because it a durable and strong material. It is able to withstand environmental forces such as strong winds and bad weather, and it is resistant to corrosion, therefore it provides a long lasting and low maintenance option for building framing. While standard designs for pre engineered buildings provide the basic framework for a functional space, prefab shelters can also be fitted with a variety of amenities such as electrical wiring and lighting, HVAC systems, comfortable interior finishes, a variety of roofing and flooring options and more. These buildings are not necessarily designed to be permanent, but when constructed with good quality materials, can last for a number of years. The popularity of using modular and pre engineered buildings will continue to increase due to the benefits in cost reduction, construction speed, portability and range of location possibilities. Modular buildings can be used permanently, as temporary spaces, outdoors or built in an existing structure, providing the versatility that builders often need.