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. The ceiling joists restrain the exterior walls from being thrust outwards as gravity loads such as snow push down on the roof. 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.

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Roof bracing requirements.

If your local building authority has a rafter spacing code you may not space rafters wider than required by code. The bracing described in this brochure covers both framed roofs and fully trussed roofs. Dormers porches do not require bracing. Truss bracing requirements are found in section r802 10 3.

The lower roof plan area no soffit 7 040 6 2 8 1 3 1 6 2 3 1 68 7 m. Roof planes less than 6m2 e g. 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.

One roof brace is required per 50 m with a minimum of two per ridge line. Roof braces can consist of either. Rafter spacing rafters must be strong enough to hold the roof sheathing and the shingles. It allows the bracing requirement to be specified in the construction documents or on the individual truss design drawings.

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. Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches. This section requires trusses to be braced to prevent rotation and to provide lateral stability. Unless the truss spans 60 feet or more special inspection of the truss web bracing installation is not required.

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