Roof Truss Terminology

Slopes at roof pitch.

Roof truss terminology.

Ansi is the american national standards institute. The truss profi le span heel height overall height overhang. Anchorage is the connection of the roof or floor truss to the building structure. Bottom chord bc or tie beam.

A gable roof has vertical planes usually on the. The part of a structural member that extends beyond its support see figure. Truss terms 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.

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. A truss consists of one or more triangles in its construction. It is fixed to ends of battens purlins or verge rafters. A truss may also be so manufactured because of transportation considerations e g.

The truss profile span heel height overall height overhang and web configuration depend on the specific design conditions and will vary by application. Tension forces being exerted on a truss member that creates pulling apart or elongating effect. The highest point on a truss. The terms pitch and slope are simply two different ways of expressing the same measurement.

The lower portion of a piggyback truss. Bearing cut or seat cut. Truss a pre built structural member capable of supporting a load over a given span. Some of the more common are listed below and are illustrated on pages 3 4.

A triangulated combination of members and joints that forms a rigid structural component of a roof designed to support both permanent and imposed loads. Truss terminology the terms below are typically used to describe the various parts of a metal plate connected wood truss. Trim along the edge of roofing at a gable end. Truss terminology technical terms used in the truss industry may not be familiar.

The gable roof provides for the most basic of roof systems. Square the amount of roofing material needed to cover 100 square feet of roof. 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. If the roof eave extends beyond the gable end wall by more than 1 then a dropped gable is normally used.

Symmetrical a truss whose loading and configuration is exactly the same on both sides of the centerline. Typical framing systems gable.