Roof Truss Joist Bracing

Nail braces vertically every 4 feet along the top and bottom of a gable truss.

Roof truss joist bracing.

A truss to reduce the laterally unsupported length of the truss member. This brace needs to be far enough up the trusses to provide headroom and still provide support for the trusses. Bracing of top chords sloping top chord of roof trusses must resist compression force due to gravity downward load on the roof such as snow load. Bracing bracing of trusses is extremely important.

This condition generally applies when trusses are spaced at 2 feet. Roof sheathing plywood osb provides effective lateral bracing when sheathing is nailed directly to top chords. A structural member installed at an angle approx. It is very important that the contractor or homeowner responsible for truss erection read through all documents inside the job packet.

Once again a 2 by 4 inch piece of lumber is placed between the trusses and parallel to the ceiling joists. Diagonal bracing provides stability by resisting the domino effect of connected trusses. This is where a high pitched roof is necessary. Use a t brace to support the truss vertically.

Turn the truss upside down and place on corner on the roof surface. It is best to brace the inside of the trusses before handling them. 2 by 4 inch pieces of lumber are attached from each end of this brace to each ceiling joist perpendicular to the ceiling joist forming a wall and supporting each truss. 45o to a truss chord or.

Trusses which are not braced or which are not braced correctly are subject to toppling over or collapse. To strengthen the roof system truss clustering cross bracing and wind bracing is recommended at both end of the buildings and every 20 for longer span buildings. Purlins 24 oc are typical along with the bottom bracing shown. Truss clusters for maximum strength this image shows a cluster of three trusses tied together.

Lifting trusses higher than one story may require a crane.