Cold roofs? Warm roofs?
What’s the main difference between roof construction options? BRANZ explains the science to help you design better roofs.
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House condition survey highlights problems
By Mark Jones – 1 June 2011, Build 124, Feature article
BRANZ recently completed its fourth house condition survey of 573 homes throughout New Zealand.
Solar potential of schools
By Zhi Jian (David) Wong and Hugh Byrd – 1 October 2011, Build 126
An energy audit at Remuera Intermediate School also investigated the potential of photovoltaics to give the school an independent energy supply and income from feeding surplus electricity into the grid.
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.
Passive roof ventilation
By Stephan Rupp – 1 February 2016, Build 152, Feature article
Twenty years ago, roofs didn’t need to be specifically ventilated. Today, things are different. That’s because 21st century homes are more airtight, and if they aren’t aired, condensation may form.
A school lesson
By Stephan Rupp, Dr Manfred Plagmann – 1 October 2020, Build 180, Feature article
BRANZ was called into a Dunedin school where too much ventilation caused excessive condensation in a large roof space. Understanding why this happened points to warm roofs being better in some locations.
The power of suburbia
By Anna Ho and Hugh Byrd – 1 April 2013, Build 135
New research suggests installing photovoltaics on roofs and driving electric cars could transform low-density suburbia from a high-energy consumer to an energy provider for the city.
Roofing underlay and moisture
By Malcolm Cunningham, Luca Quaglia – 1 October 2010, Build 120
A recently completed major BRANZ research project has improved understanding of how roofing underlays handle moisture in roofs and led to the development of a new test suitable for a wider range of roofing underlays.
It’s happening now in Papakowhai
By Lois Easton – 1 April 2008, Build 105, Feature article
Nine homes in a Porirua suburb were recently renovated to achieve greater sustainability. Monitoring continues this year to measure the results but some useful tips have already come from the project.
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Features (26)
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