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A birds-mouth joint in a rafter, set upon a double top plate. Shown are the two cuts of the joint: the seat cut and the heel cut. In light frame construction, a birdsmouth joint or bird's beak cut is a woodworking joint that is generally used to connect a roof rafter to the top plate of a supporting wall. [1]
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 obtuse angle. Karahafu: A type of gable found in some traditional Japanese buildings. Hidden roof: A type of Japanese roof construction.
A view of a roof using common purlin framing. The purlins are marked in red. This view is from the inside of the building, below the roof. The rafters are the beams of wood angled upward from the ground. They meet at the top of the gable at a ridge beam, which has extra bracing to attach it to the rafters.
The roof structure is frequently a truss roof supporting purlins or laths, or built using common rafters. Wide buildings with common rafters need interior rows of posts. Sometimes rafters may be attached directly to the poles. The roof pitch of pole buildings is usually low and the roof form is usually gable or lean-to.
In the UK, a concrete tiled roof would normally have rafters at 600 mm (24 in) centers, roof battens at 300 mm (12 in) centers and ceiling joists at 400 mm (16 in) centers. The United States still uses imperial units of measurement and framing members are typically spaced sixteen or twenty-four inches apart.
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.
It is a single-story rectangular building constructed of an exposed-log framing system with vertical-plank siding. The building rests on a concrete-pier foundation and is covered by a log-frame side-gable roof surfaced with wood shingles. Pole purlins and rafters are exposed and the roof features a stone chimney extending from the gable ridge ...
Eaves must be designed for local wind speeds as the overhang can significantly increase the wind loading on the roof. [ 7 ] The line on the ground under the outer edge of the eaves is the eavesdrip , or dripline, and in typical building planning regulations defines the extent of the building and cannot oversail the property boundary.