Periphery roof areas
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?
Wind
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Wind pressure 101
By Roger Shelton – 1 October 2009, Build 114
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.
Wind effects on buildings
By Graeme Beattie – 1 June 2010, Build 118
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.
Window wind zones
By John Burgess, John Yolland – 1 April 2012, Build 129
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.
BRANZ Maps goes mobile
By Greg Overton – 1 April 2015, Build 147
BRANZ Maps, a free online geographic information system (GIS) with information on New Zealand addresses, is now even more useful. You can access it from any mobile device to check wind zones and much more.
Are buildings ready for climate change?
By David Carradine, Nick Locke – 1 June 2022, Build 190
Research shows that, apart from some slight changes, light timber-framed buildings designed using our current standards should largely stand up to the increased wind speeds that climate change is expected to bring.
Damaging Northland storm
By Asif Iqbal – 1 June 2015, Build 148, Feature article
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.
Retrofitting to resist extreme wind
By Graeme Beattie – 1 August 2008, Build 107
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.
Design prediction of wind-induced building motion
By Ian Wells – 1 April 2009, Build 111
There are sometimes significant discrepancies between the predicted and actual building sway in taller buildings. A new study aims to develop an improved methodology for wind design of buildings.
Don’t blow my house down
By Roger Shelton – 1 August 2006, Build 95
In April, a tornado removed the roof of a Paraparaumu house. This is not a typical wind occurrence for the area, but it raises the question of whether new houses should be more able to cope with extreme events.
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