Timber Roof Structure Names

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.

Timber roof structure names.

The simplest form of pitched roof consisting of rafters inclined at 30º. Trusses usually occur at regular intervals linked by longitudinal timbers such as purlins. Wall plate this is located along the bottom of the truss along the top of the structure. 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.

Terminology timber framing roof structures note. This allows this type of roof structure to be used for greater spans than the couple roof. Purlins run parallel to the roof ridge. Ridgeboards these act as the spine along the top of the roof.

A horizontal timber or metal resting at the peak of the roof. To prevent a roof being blown off by the wind the rafters are usually notched with a birdsmouth to fit over the purlins. This extra roof member helps prevent the rafters from spreading when under load. The ridgeboard carries little or no load as rafters normally correspond to each other along the side of the ridgeboard.

Rafters and purlins are sometimes used in combination. The strip of iron attached to the purlin. Various types of common rafter roofs and names of the associated members. The central vertical post in a king post roof truss.

Principal rafters form the sloping gable roof line on each bent. A diagonal member of the truss that has a compressive force acting on it and used to maintain rigidity and add strength to the structure. As you known the skeleton produce the shape of animals even humans. In a simple pitched timber roof the horizontal timber members beams called purlins support the sloping secondary timber members rafters.

Roof trusses can be said to be the skeleton of the roof. Roof support timbers that extend upward from the wall plate to the topmost ridge beam are called rafters. The rafters and trusses are connected to the ridge board for a cohesive framework. A composite decking made of solid materials.

The roof also depend on its trusses for it shape. Collar roof a collar roof incorporates a horizontal roof member positioned approximately one third of the distance from the ridge to the wall plate line. The space between each truss is known as a bay.