Passive roof ventilation
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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Letters
1 April 2016, Build 153
D is for drainage and drying
By Trevor Pringle – 1 December 2016, Build 157, Feature article
Continuing our alphabetical guide to the science of building, D is for two crucial functions, drainage and drying.
Roof ventilation
By Dr Manfred Plagmann – 1 December 2016, Build 157, Feature article
BRANZ physicists have developed a useful calculation for designers to work out the minimum number and area of vents required in roof spaces.
Sizing E2 roof flashings
By Ann Galloway – 1 June 2016, Build 154
It can be difficult to determine the critical dimensions for roof flashings in E2/AS1. We step through Table 7 to help clarify confusion when working out the minimum sizes of flashings.
Vents in skillion roofs
By Dr Manfred Plagmann – 1 August 2016, Build 155
Some roof designs, such as skillion roofs, must include ventilation to manage roof moisture. Recent BRANZ research provides advice on the best place for effective vent openings in low wind zones.
Preparing for natural hazards
By Ian Page – 1 April 2016, Build 153, Feature article
BRANZ has done a lot of work on the costs and benefits of mitigating common natural hazards in housing. While some options are cost-effective, others hardly justify the expenditure.
Apartment upgrade
By Roman Jaques – 1 June 2016, Build 154, Feature article
BRANZ Is monitoring an ageing Wellington City Council apartment block during a major upgrade to establish building performance and occupier satisfaction. This will give valuable advice for other apartment upgrades.
Veranda design and construction
By Alide Elkink – 1 August 2016, Build 155
The BRANZ helpline often receives questions about veranda design and construction. Here, we answer some of those questions.
Reflecting on colour
By Mike Clowes – 1 August 2016, Build 155, Feature article
Choosing the right colour for a building cladding is about more than just looks. Some paint colours absorb heat and can cause problems, but use the appropriate reflectance value and you can specify with confidence.
