Roof Trusses Wind Brace

Bracing bracing of trusses is extremely important.

Roof trusses wind brace.

Sketch of a roof showing some of the parts. Roof bracing is a pre punched v shaped component that fixes in an x or v pattern to the top of the top chord to firmly brace roof trusses to the building frame. The old timber wind bracing as shown in this sketch using say 150 x 35 to 100 x 50 is just about redundant. Wind bracing keeps the roof trusses upright and square to the roof basically they stop the roof from being blown down when its being constructed but more importantly when its tiled.

Nail braces vertically every 4 feet along the top and bottom of a gable truss. Sloping top chord of roof trusses must resist compression force due to gravity downward load on the roof such as snow load. Then work away from the braced end filling in the open 8 to 12 ft. If its a truss roof then wind bracing is important when they design the roof they also design a wind bracing plan so the wind braces are positioned correctly.

In from the gable end and brace it to the deck. It is very important that the contractor or homeowner responsible for truss erection read through all documents inside the job packet. Install 2x4s at a 45 degree angle. Wind bracing should be placed at 30 60 angles.

This can be done by bracing from the floor deck as shown below. Roof sheathing plywood osb provides effective lateral bracing when sheathing is nailed directly to top chords. This condition generally applies when trusses are spaced at 2 feet. Start several trusses in.

Use a t brace to support the truss vertically. Alternatively start the first truss 8 to 12 ft. Now that the trusses are installed i make sure all the poles are plumb and headers are straight. Then i go through and install my runners along the bottom.

Wind bracing truss clusters at both gable ends and at least every 20 add wind bracing green for truss clusters. It can be timber or metal strut in compression or a tie in tension. Section last after permanently bracing the rest of the trusses. Trusses which are not braced or which are not braced correctly are subject to toppling over or collapse.

Truss stability bracing this is permanent bracing which holds the trusses upright straight and prevents any out of plane buckling of the members. Wind or wall bracingthis bracing is installed in the roof in addition to the truss stability bracing and its purpose is to stabilise the gable walls under the action of wind loading. The images below show these critical components and their recommended placement.