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The free-standing posts in the interior of the house and the posts in the gable or lateral walls were originally called Firstsäule ("ridge columns"). On a purlin roof the ridge posts carry the ridge purlin. On the latter are hung the sloping rafters to which the roof is fixed. This type of Firstständerhaus was predominantly built around the ...
The simplest form of roof framing is a common rafter roof. This roof framing has nothing but rafters and a tie beam at the bottoms of the rafters. The next step in the development of roof framing was to add a collar, called a collar beam roof. Collar beam roofs are suitable for spans up to around (4.5 meters). [5]
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.
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.
Barge rafter: The outermost rafter on a gable end, sometimes forming a roof overhang. Butt rafter: A smaller rafter interrupted by and joined to a butt purlin. Common rafters pass over and are supported by a principal purlin, if present. A "binding rafter" is not a rafter but an obsolete name for a purlin or support. Part of a cruck frame may ...
A lookout, [1] lookout rafter or roof outlooker [2] is a wooden joist that extends in cantilever out from the exterior wall (or wall plate) of a building, supporting the roof sheathing and providing a nailing surface for the fascia boards. When not exposed it serves to fasten the finish materials of the eaves.
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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 ...