Roof Truss Terminology

The truss profi le span heel height overall height overhang.

Roof truss terminology.

The terms pitch and slope are simply two different ways of expressing the same measurement. Bearing cut or seat cut. The same roof has a 4 12 or 1 3 pitch. Truss terminology the terms below are typically used to describe the various parts of a metal plate connected wood truss.

Pitched truss any truss in which the top chord is sloped and the bottom chord is horizontal. 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. Square the amount of roofing material needed to cover 100 square feet of roof.

Symmetrical a truss whose loading and configuration is exactly the same on both sides of the centerline. Tension forces being exerted on a truss member that creates pulling apart or elongating effect. Roof trusses manufacturers terminology components of a truss apex peak. Truss terms the terms below are typically used to describe the various parts of a metal plate connected wood truss.

A truss consists of one or more triangles in its construction. Trim along the edge of roofing at a gable end. Truss a pre built structural member capable of supporting a load over a given span. The lower portion of a piggyback truss.

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. A truss may also be so manufactured because of transportation considerations e g. The part of a structural member that extends beyond its support see figure.

Slopes at roof pitch. 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 truss profile span heel height overall height overhang and web configuration depend on the specific design conditions and will vary by application. It is fixed to ends of battens purlins or verge rafters.

Bottom chord bc or tie beam. A gable roof has vertical planes usually on the. If the roof eave extends beyond the gable end wall by more than 1 then a dropped gable is normally used. 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 gable roof provides for the most basic of roof systems.