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The top members of a truss are known generically as the top chord, bottom members as the bottom chord, and the interior members as webs. In historic carpentry the top chords are often called rafters, and the bottom chord is often referred to as a tie beam. There are two main types of timber roof trusses: closed, in which the bottom chord is ...
Quatrefoil above the west door of Croyland Abbey showing in relief scenes from the life of Saint Guthlac Quatrefoil window at the St. Petrus parish church in Peterslahr, Germany A quatrefoil (anciently caterfoil ) [ 1 ] is a decorative element consisting of a symmetrical shape which forms the overall outline of four partially overlapping ...
A full cruck does not need a tie beam. Base cruck: tops of the blades are truncated by the first transverse member such as by a tie beam. Raised cruck: blades land on masonry wall, and extend to the ridge. Middle cruck: blades land on masonry wall, and are truncated by a collar. Upper cruck: blades land on a tie beam, similar to knee rafters.
Exposed Fastener panels are held down by fasteners through the outside of the metal, whereas Hidden Fastener Panels are held by hidden fasteners, clips, and sometimes adhesives. Typical metals include Galvanized Steel, Galvalume, Aluminum, Copper, or Vinyl 9Which while not metal is included in many cases for its matching profiles).
Sandwich panels are an example of a sandwich-structured composite: the strength and lightness of this technology makes it popular and widespread. Its versatility means that the panels have many applications and come in many forms: the core and skin materials can vary widely and the core may be a honeycomb or a solid filling.
The parallel chord truss, or flat truss, gets its name from its parallel top and bottom chords. It is often used for floor construction. A combination of the two is a truncated truss, used in hip roof construction. A metal plate-connected wood truss is a roof or floor truss whose wood members are connected with metal connector plates.