Timber Roof Framing Terminology

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Timber roof framing terminology.

The simplest form of pitched roof consisting of rafters inclined at 30º. The most commonly used joinery in timber framing systems. This article describes and illustrates the different types of support that prevents roof sagging and wall bulging at buildings including definitions of collar ties rafter ties and structural ridge beams. Timber framing can be confusing if you re unfamiliar with the terminology used.

The primary horizontal support timbers in a timber frame. Each bent forms an end wall in a bay. What s the difference between a bent and bay system and a post and beam system. A bearing timber forming part of a suspended timber floor to which the floor boards are nailed to the top and a ceiling may be attached beneath or 2 ceiling joist.

Roof framing terms are related to the parts of a triangle. The following glossary assumes that longitudinal is the direction in the ground plan which runs parallel to the ridge while transversal is the direction parallel to the gables or orthogonal to the ridge. Like individual slices in a bread loaf bents extend completely through. Terminology timber framing page 1 terminology timber framing roof structures note.

A 45 degree flat edge planed or routed along the outer or leading edges of a timber. A bearing timber spanning an area to which a ceiling is fixed to the underside only. In the following section we ll cover some of the more common roof and rafter terms you ll need. The primary vertical timbers in a timber frame.

Roof features associated with basic roof framing terms are shown in figure 2 2. Wood used in. Some of these can support the roof and prevent ridge sagging and wall spreading. Horizontal timbers used to support floors and ceilings.

Series of timbers that are used to support roofs. It is a waterproofing layer made of regular felt stacked above the solid. A composite decking made of solid materials it resembles real wood and particularly strong and stable for bearing heavy load. Terminology timber framing system terminology.

Collar ties rafter ties tension beams structural ridge beams. A horizontal timber or metal resting at the peak of the roof the rafters and trusses are connected to the ridge board for a cohesive framework. What was once a pole or timber is now a milled board typically a 1 by 6 or larger for houses hence today s use of the term ridge board. Below is a list of terms related to the timber frame industry.

A diagonal piece of timber used to support beams. Common timber frame terms adze. In the 17th and 18th centuries ridge piece and ridge pole were used respectively to designate a horizontal timber or a pole at the ridge of a roof.