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School indoor moisture

By Stephan Rupp, Cara Askew 1 February 2017, Build 158, Feature article

BRANZ has been measuring moisture levels in a school’s classrooms. This information is providing a sound basis for understanding the indoor climate and designing moisture-safe long-span roofs in schools.

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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.

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Adding eaves

By Trevor Pringle 1 August 2012, Build 131

A common feature of many leaky buildings is that they were constructed without eaves, usually with walls terminating with a parapet. Changing this design detail can greatly enhance a building’s weathertightness.

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Aggravated thermal bridging

By Malcolm Cunningham 1 December 2011, Build 127, Feature article

Recently, several cases of an insidious new form of thermal bridging have been seen. Aggravating factors have been identified that contributed to the problem, so there are now lessons to be learnt to avoid this on other buildings.

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E2 and E2/AS1

By Greg Burn 1 August 2010, Build 119

When it comes to weathertightness, Building Code Clause E2 External moisture and the compliance document E2/AS1 are the critical documents for any designer.

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