Roof Truss Joist Bracing

Trusses which are not braced or which are not braced correctly are subject to toppling over or collapse.

Roof truss joist bracing.

Once again a 2 by 4 inch piece of lumber is placed between the trusses and parallel to the ceiling joists. A structural member installed at an angle approx. Truss clusters for maximum strength this image shows a cluster of three trusses tied together. Nail braces vertically every 4 feet along the top and bottom of a gable truss.

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. The continuous lateral restraint forces the connected truss members to move in the same direction. Use a t brace to support the truss vertically. Purlins 24 oc are typical along with the bottom bracing shown.

Lifting trusses higher than one story may require a crane. Turn the truss upside down and place on corner on the roof surface. This brace needs to be far enough up the trusses to provide headroom and still provide support for the trusses. This is where a high pitched roof is necessary.

It is best to brace the inside of the trusses before handling them. 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. Install 2x4s at a 45 degree angle. Roof sheathing plywood osb provides effective lateral bracing when sheathing is nailed directly to top chords.

It is very important that the contractor or homeowner responsible for truss erection read through all documents inside the job packet. 45o to a truss chord or. 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. This condition generally applies when trusses are spaced at 2 feet.

Diagonal bracing provides stability by resisting the domino effect of connected trusses.