Window wind zones
Recent changes to NZS 3604:2011 Timber-framed buildings and NZS 4211:2008 Specification for performance of windows has created an inconsistency between wind zones in these standards.
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Recent changes to NZS 3604:2011 Timber-framed buildings and NZS 4211:2008 Specification for performance of windows has created an inconsistency between wind zones in these standards.
Roof failures in high winds are unfortunately too common in timber-framed buildings, but get the connections right, and the roof should stay put.
You could be forgiven for getting the wind up about wind speeds, pressures and zones, but don’t worry. Here, we go back to basics to explain how they relate to one another.
While we can’t change New Zealand’s gusty climate, there’s plenty we can do to minimise its impact. Clever siting of buildings, modifying the landscape and providing shelter in the form of fences and plantings help.
The number of calls to the BRANZ Helpline suggest there is still a lot of confusion around when wind and air barriers are needed under the New Zealand Building Code.
A new wind zone category, extra high, has been added in the revised NZS 3604:2011 Timber-framed buildings, and the amended E2/AS1.
Considering wind uplift should be top of mind when replacing a heavy roof with a lighter one, NZS 3604:2011 Timber-framed buildings outlines the necessary top plate connections.
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?
Often wind determines the bracing requirement for timber-framed buildings. We walk through how to find the correct wind zone for a site using NZS 3604:2011.