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?
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A new wind zone category, extra high, has been added in the revised NZS 3604:2011 Timber-framed buildings, and the amended E2/AS1.
BRANZ was on the ground in Northland last year, examining the effects of a storm on buildings. Roofs bore the brunt of the weather, with structures on exposed terrain the most vulnerable.
Strong wind causes damage to houses, particularly their roofs. A recent BRANZ study started by defining ‘extreme winds’ before developing retrofit solutions to ensure roofs on older houses are adequately secured.
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.
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.
With the help of BRANZ data, the Riskscape joint project between NIWA and GNS aims to better predict the costs of damaging wind events on buildings.
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.