Retrofitting to resist extreme wind
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.
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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.
Bracing supplement
1 April 2014, Build 141 Supplement
Providing sufficient bracing capacity for wind and earthquake is an integral part of the design process.
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.
Deck barriers
By Alide Elkink – 1 April 2013, Build 135
Where it’s possible to fall 1.0 m or more from a deck, the Building Code requires a barrier able to withstand all imposed, wind and impact loads. We look at some options.
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.
Understanding loads
By Roger Shelton – 1 October 2014, Build 144
Enquiries to the BRANZ helpline show that the meanings of characteristic strength, capacity, ultimate load and serviceability load are not well understood. We take a look at what the various terms mean.
Beam and truss uplifts
By Roger Shelton – 1 August 2015, Build 149
Roof failures in high winds are unfortunately too common in timber-framed buildings, but get the connections right, and the roof should stay put.
Joining roof trusses
By In Ling Ng – 1 October 2015, Build 150
Most timber trusses are delivered to site as one-piece building components. However, occasionally they are delivered in sections and must be joined on site. Correct installation of these is critical to maintain the designed load paths.
Periphery roof areas
By Roger Shelton – 1 June 2008, Build 106
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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