Roof Bracing Requirements

Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches.

Roof bracing requirements.

This section requires trusses to be braced to prevent rotation and to provide lateral stability. Roof braces can consist of either. One roof brace per 50m2 of roof area see rule 8 for minimum requirements one roof brace per 25m2 of roof area see rule 8 for minimum requirements 1. The ceiling joists restrain the exterior walls from being thrust outwards as gravity loads such as snow push down on the roof.

This is an area where the code requirements could be improved. Truss web bracing is critical to the stability of the roof system yet very few residential projects have engineering observation of completed roof systems. It allows the bracing requirement to be specified in the construction documents or on the individual truss design drawings. Unless the truss spans 60 feet or more special inspection of the truss web bracing installation is not required.

I roof plane brace or. If your local building authority has a rafter spacing code you may not space rafters wider than required by code. Rafter spacing rafters must be strong enough to hold the roof sheathing and the shingles. Collar ties are required in the upper third of the roof system to provide restraint against the roof being pulled upward and outward from wind.

The lower roof plan area no soffit 7 040 6 2 8 1 3 1 6 2 3 1 68 7 m. One roof brace is required per 50 m with a minimum of two per ridge line. The bracing described in this brochure covers both framed roofs and fully trussed roofs. Lower roof solution minimum of two braces are required for the lower storey roof but also a minimum of two per ridge line see figure 1.