Roof Truss Terminology

Bottom chord bc or tie beam.

Roof truss terminology.

Roof trusses manufacturers terminology components of a truss apex peak. The truss profile span heel height overall height overhang and web configuration depend on the specific design conditions and will vary by application. Truss a pre built structural member capable of supporting a load over a given span. Trim along the edge of roofing at a gable end.

Typical framing systems gable. A truss may also be so manufactured because of transportation considerations e g. A truss consists of one or more triangles in its construction. The part of a structural member that extends beyond its support see figure.

The same roof has a 4 12 or 1 3 pitch. Tension forces being exerted on a truss member that creates pulling apart or elongating effect. The lower portion of a piggyback truss. Truss terms the terms below are typically used to describe the various parts of a metal plate connected wood truss.

The terms pitch and slope are simply two different ways of expressing the same measurement. Ansi is the american national standards institute. A triangulated combination of members and joints that forms a rigid structural component of a roof designed to support both permanent and imposed loads. The truss profi le span heel height overall height overhang.

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. The gable roof provides for the most basic of roof systems. A gable roof has vertical planes usually on the. Pitched truss any truss in which the top chord is sloped and the bottom chord is horizontal.

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. Flat truss a truss which has the top chord parallel to the bottom chord over the entire length of the truss. Symmetrical a truss whose loading and configuration is exactly the same on both sides of the centerline.

It is fixed to ends of battens purlins or verge rafters. Truss terminology the terms below are typically used to describe the various parts of a metal plate connected wood 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. Some of the more common are listed below and are illustrated on pages 3 4.

Slopes at roof pitch. Bearing cut or seat cut.