Roof Bracing Requirements

Truss bracing requirements are found in section r802 10 3.

Roof bracing requirements.

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. This is an area where the code requirements could be improved. Dormers porches do not require bracing. I roof plane brace or.

One roof brace is required per 50 m with a minimum of two per ridge line. 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. 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. If your local building authority has a rafter spacing code you may not space rafters wider than required by code.

Roof planes less than 6m2 e g. Truss web bracing is critical to the stability of the roof system yet very few residential projects have engineering observation of completed roof systems. The bracing described in this brochure covers both framed roofs and fully trussed roofs. The lower roof plan area no soffit 7 040 6 2 8 1 3 1 6 2 3 1 68 7 m.

The ceiling joists restrain the exterior walls from being thrust outwards as gravity loads such as snow push down on the roof. Roof braces can consist of either. This section requires trusses to be braced to prevent rotation and to provide lateral stability. Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches.