Judging by the number of calls to the BRANZ Helpline, there’s some confusion around bracing requirements for monopitch roofs. Here, we sort out the issue.
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Roof bracing is one element in a continuum that provides resistance to horizontal loads. It works with the wall and foundation bracing to supply a total bracing package for a building.
We complete this four-part Build series on calculating bracing requirements by looking at roof bracing.
The area around the edge of a roof requires extra fixings to stop it lifting, but how much of the total roof area needs these extra fixings?
A new wind zone category, extra high, has been added in the revised NZS 3604:2011 Timber-framed buildings, and the amended E2/AS1.
Pitched roofs constructed with timber rafters are described in NZS 3604:2011 Timber-framed buildings as either couple-close or skillion roofs. What are the rafter fixing requirements?
Providing sufficient bracing capacity for wind and earthquake is an integral part of the design process. This series starts by looking at the information needed for bracing calculations.
NZS 3604:2011 Timber-framed buildings sets out how to size rafters in table 10.1. The BRANZ technical helpline has received queries on doing this, so let’s step through some examples.
Verge overhangs are the areas of a timber-framed roof that are most vulnerable to wind damage, so it’s important to get them right.