Roof Truss Terminology

Anchorage is the connection of the roof or floor truss to the building structure.

Roof truss terminology.

Symmetrical a truss whose loading and configuration is exactly the same on both sides of the centerline. The truss profi le span heel height overall height overhang. Some of the more common are listed below and are illustrated on pages 3 4. The part of a structural member that extends beyond its support see figure.

Slopes at roof pitch. Typical framing systems gable. It is fixed to ends of battens purlins or verge rafters. The lower portion of a piggyback truss.

A truss may also be so manufactured because of transportation considerations e g. The gable roof provides for the most basic of roof systems. A gable roof has vertical planes usually on the. Bottom chord bc or tie beam.

The truss profile span heel height overall height overhang and web configuration depend on the specific design conditions and will vary by application. Flat truss a truss which has the top chord parallel to the bottom chord over the entire length of the truss. The same roof has a 4 12 or 1 3 pitch. Square the amount of roofing material needed to cover 100 square feet of roof.

Truss terminology technical terms used in the truss industry may not be familiar. 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 consists of one or more triangles in its construction. Ansi is the american national standards institute.

Truss terms the terms below are typically used to describe the various parts of a metal plate connected wood 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. If the roof eave extends beyond the gable end wall by more than 1 then a dropped gable is normally used. Bearing cut or seat cut.

The highest point on a truss. Truss terminology the terms below are typically used to describe the various parts of a metal plate connected wood 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. Pitched truss any truss in which the top chord is sloped and the bottom chord is horizontal.

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.