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Two king post trusses linked to support a roof. Key:1: ridge beam, 2: purlins, 3: common rafters. This is an example of a "double roof" with principal rafters and common rafters. A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof.
Purlin plates are beams which support the mid-span of rafters and are supported by posts. By supporting the rafters they allow longer spans than the rafters alone could span, thus allowing a wider building. Purlin plates are very commonly found in large old barns in North America.
The top ends of the rafters often meet at a ridge beam, but may butt directly to another rafter to form a pair of rafters called a couple. Depending on the roof covering material, either horizontal laths , battens , or purlins are fixed to the rafters; or boards, plywood , or oriented strand board form the roof deck (also called the sheeting or ...
sill-beams (also called ground-sills or sole-pieces, at the bottom of a wall into which posts and studs are fitted using tenons), noggin-pieces (the horizontal timbers forming the tops and bottoms of the frames of infill panels), wall-plates (at the top of timber-framed walls that support the trusses and joists of the roof).
Lateral Queen – a pair of braced posts between a tie beam and collar beam. Prince – A strut associated with a king post truss. princess – A strut associated with a queen strut but shorter. [25] Crown – A post on a tie beam or collar beam carrying a crown plate. [26] Crown strut: A piece similar to a crown post but not carrying a plate. [27]
Rafter and tie-beam joints (Carpentry and Joinery, 1925) Coyau or sprocket. Labeled A. A rafter is one of a series of sloped structural members such as steel beams that extend from the ridge or hip to the wall plate, downslope perimeter or eave, and that are designed to support the roof shingles, roof deck, roof covering and its associated ...
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Monitor roof: A roof with a monitor; 'a raised structure running part or all of the way along the ridge of a double-pitched roof, with its own roof running parallel with the main roof.' Butterfly roof (V-roof, [8] London roof [9]): A V-shaped roof resembling an open book. A kink separates the roof into two parts running towards each other at an ...