Terms For Roof Truss Members

The same roof has a 4 12 or 1 3 pitch.

Terms for roof truss members.

A roof truss consists essentially of the following components. Components of a steel roof truss. There are two main types of timber roof trusses. The terms pitch and slope are simply two different ways of expressing the same measurement.

The following diagram shows the terms applying to gable end roofs. Hangers connect carried trusses to the carrier or girder. A roof s slope is the number of inches it rises for every 12 inches of horizontal run a roof with a 4 in 12 slope rises 4 inches for every 12 inches of horizontal run. The top members of a truss are known generically as the top chord bottom members as the bottom chord and the interior members as webs.

The following diagram shows the terms used for general roof truss members. The uppermost point of a truss. Truss members are made up of all equivalent equilateral triangles. A horizontal or inclined member that establishes the lower edge of a truss usually carrying combined tension and bending stresses.

Truss members form a series of equilateral triangles alternating up and down. A metal plate connected wood truss is a roof or floor truss whose wood members are connected with metal connector plates. Scupper an opening in a roof usually faced with metal flashing to drain water from the roof at a given point. Closed in which the bottom chord is horizontal and at the foot of the truss and open in which the bottom chords are raised to provide more open space also known as raised bottom chord.

4x2 truss has its members have the nominal 2 face up for plate embedment the 4 2 truss is a nominal 4 deep rather than a nominal 2 deep. Cantilever that structural portion of a truss which extends beyond the support bearing the cantilever dimension is measured from the outside face of the support to the heel joint. A percentage increase in the stress permitted in a member based on the duration of the load causing the stress acts on the member. 4 2 design is used for shallow floor trusses.

When a roof is to be provided for a building which does not have interior supports and the exterior walls are more than 12 m apart a roof truss will be a convenient arrangement to support the roof. Roof cap the total roof assembly members located above the wall line such as beams trusses plates purlins decking bridging ceiling roofing etc. Saddle a covering on the ridge of the roof so that water will drain.