Parts Of A Timber Roof Truss

Bearing cut or seat cut.

Parts of a timber roof truss.

Roof truss parts explained. Rafters have a tendency to flatten under gravity thrusting outwards on the walls. A composite decking made of solid materials it resembles real wood and particularly strong and stable for bearing heavy load. Horizontal beams supported by posts and used to support the mid span of rafters to cover longer spans these are used in large buildings like the traditional large old barns in the us.

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. The wall plate width see figure 7. Cantilever part of structural member that extends beyond its support. It is a waterproofing layer made of regular felt stacked above the solid.

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. A slight vertical cut usually less than 75mm at the. Bottom chords bc the lowest longitudinal member of a truss. A horizontal cut to the bottom of a sloping bottom chord usually the width of the bearing i e.

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 trusses usually occur at regular intervals linked by longitudinal timbers such as purlins the space between each truss is known as a bay. Modern timber roofs are mostly framed with pairs of common rafters or prefabricated wooden trusses fastened together with truss connector plates timber framed and historic buildings may be framed with principal rafters or timber roof trusses roofs are also designated as warm or cold roof depending on how they are designed and built with regard to thermal building insulation and ventilation. The basic components of a roof truss. Structural support of trusses usually walls normally with a timber wall plate.

Apex highest point where the sloping top chords meet.