Roof Truss Terminology

Truss terminology the terms below are typically used to describe the various parts of a metal plate connected wood truss.

Roof truss terminology.

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 truss profile span heel height overall height overhang and web configuration depend on the specific design conditions and will vary by application. The lower portion of a piggyback truss. Ansi tpi 1 1 1995 is a publication of the truss plate institute tpi and ansi defining a standard for design and manufacture for metal plate connected wood trusses mpcwt.

Truss terminology technical terms used in the truss industry may not be familiar. Ansi is the american national standards institute. The highest point on a truss. Truss a pre built structural member capable of supporting a load over a given span.

A gable roof has vertical planes usually on the. Square the amount of roofing material needed to cover 100 square feet of roof. The truss profi le span heel height overall height overhang. Trim along the edge of roofing at a gable end.

Symmetrical a truss whose loading and configuration is exactly the same on both sides of the centerline. Typical framing systems gable. Some of the more common are listed below and are illustrated on pages 3 4. Bottom chord bc or tie beam.

A truss consists of one or more triangles in its construction. Anchorage is the connection of the roof or floor truss to the building structure. Bearing cut or seat cut. The terms pitch and slope are simply two different ways of expressing the same measurement.

Flat truss a truss which has the top chord parallel to the bottom chord over the entire length of the truss. A triangulated combination of members and joints that forms a rigid structural component of a roof designed to support both permanent and imposed loads. If the roof eave extends beyond the gable end wall by more than 1 then a dropped gable is normally used. Roof trusses manufacturers terminology components of a truss apex peak.

Tension forces being exerted on a truss member that creates pulling apart or elongating effect. Truss terms the terms below are typically used to describe the various parts of a metal plate connected wood truss. It is fixed to ends of battens purlins or verge rafters. Pitched truss any truss in which the top chord is sloped and the bottom chord is horizontal.

The same roof has a 4 12 or 1 3 pitch. The gable roof provides for the most basic of roof systems.