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An Improved Open Web Joist Using Knurled Pins and a Heel Bearing Connection

A Web Joist is a pin-connected truss manufactured with wood chords and steel webs. Web Joist have been used successfully in many projects. It is a very economical floor and roof system when compared to other construction materials; especially when ceiling, decking, floor fill materials and labor costs are considered.

Product Description

Web Joist Open Web trusses consist of structural wood top and bottom chords and tubular steel web members. The webs have machined ends, inserted into the chords, secured with knurled steel pins. The end connections bear directly on their supports. The chords are assembled using glued finger joints and are precision drilled and routed for the web connections. The steel webs are galvanized tubing with a 45,000 psi minimum yield strength. Various gauges (19, 18, 16, 14, and 13) of 1", 1 1/8", 1 1/4", and 1 1/2" diameter tubing are used, depending on the truss series and as is most appropriate for the specified loading requirements. The pins are 3/8", 1/2", 5/8", or 3/4" diameter with a patented knurled upset to assure tight joints. Steel bearing angles are used at truss supports. Accessory items such as bridging and precut blocking are also available from Web Joist.

Various Profiles Available

Web Joist trusses are available with top or bottom chord bearings, with or without cantilevers and in various profiles. The most common profiles are with the top chord and bottom chords parallel, tapered, or pitched of various depths. Other profiles may be available on request.

Series Designations

Version 1 trusses use 2x4 machine stress rated (MSR) lumber for both chords. Depth range is from 14" to 40" for parallel profile and 14" to 44" for taper/pitch profiles.

Version 1 wide series trusses use 2x6 machine stress rated (MSR) lumber for both chords. Depth range is from 14" to 40" for parallel profile, and 14" to 44" for taper/pitch profiles.

Version 2 trusses use 3x4 LAM-CHORD. Depth range from 22" to 48" for parallel profile, and 18" to 52" for taper/pitch profiles.

Photo of light series truss with bridging strap. Version 1 floor truss with bridging straps and bridging.

Photo of light series wide truss with bottom bearing vertical web. Version 1 wide series with bottom bearing vertical web.

Photo of heavy series truss. Version 2 truss with 3"x4" laminated lumber
and top chord bearing.

Engineered Designs and Shop Drawings

Each Web Joist truss is custom designed using specialized computer software to verify the web positions and material selection is most appropriate for the span, depth, on-center spacing, and all specified loads. The Web Joist engineering department will provide designs for all trusses on a project. Web Joist also furnishes shop drawings in accordance with specifications. The drawings reflect the span, loads, spacing and arrangement of the trusses required to meet the criteria of the plans. Approval of the shop drawings is required prior to fabrication.

Product Guide

Click here to view or download the complete Web Joist Truss Product Guide containing installation details, load tables, and other specifications.

Cover image of Web Joist Truss Product Guide.

Web Joist™
Product Guide

Cover image of Web Joist WEB-i Product Guide.

Web Joist
Product Guide