![]() Ridge Board: A non-structural member of the truss where rafters can lean against and connect to. It’s also more lightweight and can be used to cover larger areas. Unlike the King Post, the Queen Post has two vertical wooden posts called the queen post. Parts of a traditional queen post roof trussĪ Queen Post Roof Truss is essentially a modification of the King Post Truss. ![]() There are three types of purlins in wood construction: Purlin plates (Under purlin), Principal purlins, and Common purlins. Purlin: The longitudinal horizontal beam that is sitting on a post or the principal rafter of a truss and used to support common rafters. Purlin Cleat: The strip of iron attached to the purlin. Tie Beam: The horizontal beam connecting two rafters. King Post: The central vertical post in a King Post Roof Truss. Supporting Wall: A chief structural member as it is a load-bearing wall. Wall Plate: A piece of lumber laid horizontally on a wall to support the rafter. Principal Rafter: The larger rafter that sits directly on a tie beam and is used to carry a purlin. Ridge Board: A non-structural member of the truss where rafters can lean against and connect to.Ĭommon Rafter: Also called minor rafter because it is smaller than Principal Rafter/Major Rafter. It is often used in simple roof trusses such as in the shed, porch, and garage. In a nutshell, it’s made up of a central vertical post called the king post, two rafters meeting at the apex, and a tie beam or the horizontal base. The King Post Roof Truss is the simplest of trusses because of its simple composition. Anatomy of a traditional king post roof truss ![]() Top Plate: The horizontal beam that supports the roof by supporting the rafters to the wall studs. It is used to connect the rafter to the supporting wall.Ĭantilevered Top Plate: A projecting beam that transports the load it is carrying to load-bearing support.Ĭeiling Joist: The horizontal base that supports the rafters. Strutting Beam: The horizontal beam that supports roof loads and transfers them directly to load-bearing walls.īirdsmouth Cut: Also birds mouth joint or bird’s beak cut, it’s so-called because the joint’s indention cut resembles that of a bird’s mouth. Plumb Cut: The outward-facing vertical cut of a rafter designed to ram against the ridge board. It is often used to prevent the separation of the rafters during high winds but can also be used simply to frame the ceiling. Ridge Beam: So-called because it is the horizontal beam that supports the ends of the rafters at the ridge.Ĭollar Tie: A horizontal beam that connects two rafters near the ridge of a roof. Strut: A diagonal member of the truss that has a compressive force acting on it and is used to maintain rigidity and add strength to the structure. These are used in large buildings like the traditional large old barns in the US. Underpurlin: Horizontal beams supported by posts and used to support the mid-span of rafters to cover longer spans. Rafter: One of a series of diagonal members of the truss that meet at the apex in order to support the roof deck and its loads.
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