A truss in architecture refers to a form made of wood or metal that serves as a framework for the roof or sometimes the floor of a building. Trusses are generally prefabricated in a factory setting and delivered intact to the building site, where they are lifted into place by a crane. Trusses are used instead of stick-built components that are constructed of individual pieces of lumber on the building site. They offer several advantages, including uniformity, the potential to span a greater distance, and a neater appearance. However, they are usually costlier and can limit available space. Waterville lenticular truss bridge, Pennsylvania. By Joseph Elliott, cropped by User:Ruhrfisch [Public domain], via Wikimedia Commons Timber roof truss of church. Garchy at English Wikipedia [CC BY 3.0 (http://creativecommons.org/licenses/by/3.0)], via Wikimedia Commons
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