Roof Truss Terminology

Ansi is the american national standards institute.

Roof truss terminology.

Anchorage is the connection of the roof or floor truss to the building structure. Truss terminology technical terms used in the truss industry may not be familiar. Slopes at roof pitch. Typical framing systems gable.

Roof trusses manufacturers terminology components of a truss apex peak. The lower portion of a piggyback truss. 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. A truss may also be so manufactured because of transportation considerations e g.

If the roof eave extends beyond the gable end wall by more than 1 then a dropped gable is normally used. It is fixed to ends of battens purlins or verge rafters. The terms pitch and slope are simply two different ways of expressing the same measurement. Truss a pre built structural member capable of supporting a load over a given span.

Truss terminology the terms below are typically used to describe the various parts of a metal plate connected wood truss. Flat truss a truss which has the top chord parallel to the bottom chord over the entire length of the truss. The gable roof provides for the most basic of roof systems. The part of a structural member that extends beyond its support see figure.

Tension forces being exerted on a truss member that creates pulling apart or elongating effect. Some of the more common are listed below and are illustrated on pages 3 4. Symmetrical a truss whose loading and configuration is exactly the same on both sides of the centerline. A gable roof has vertical planes usually on the.

The truss profi le span heel height overall height overhang. A triangulated combination of members and joints that forms a rigid structural component of a roof designed to support both permanent and imposed loads. Trim along the edge of roofing at a gable end. A truss consists of one or more triangles in its construction.

Pitched truss any truss in which the top chord is sloped and the bottom chord is horizontal. The truss profile span heel height overall height overhang and web configuration depend on the specific design conditions and will vary by application. The highest point on a truss. The same roof has a 4 12 or 1 3 pitch.

Bottom chord bc or tie beam. Bearing cut or seat cut.