Wall underlays hold it together
BRANZ recently completed research looking at the durability of wall underlays to address anecdotal reports of disintegration of some underlays several years ago.
Building wraps and underlays
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Getting clear on vapour barriers and underlays
By Stephen Sargent – 1 April 2007, Build 99
A wall or roof underlay is very different from a vapour barrier. One lets moisture through and out of a building and the other doesn’t. Using the wrong one will trap moisture where you don’t want it.
Installation of roofing underlay
By Alide Elkink – 1 June 2007, Build 100
Underlay is an essential part of roofing installation, but there still appears to be some uncertainty about its use and installation.
Wind and air barriers
By Eddie Bruce – 1 August 2008, Build 107
The number of calls to the BRANZ Helpline suggest there is still a lot of confusion around when wind and air barriers are needed under the New Zealand Building Code.
There’s more than one way to skin a cat… or build a cavity
By Trevor Pringle – 1 December 2004, Build 85
Drained and vented cavities differ in width for masonry veneer and those behind other types of cladding. It’s important to understand these differences.
Retrofitting flexible wall underlay
By Alide Elkink – 1 June 2010, Build 118
Older houses may have no building paper. Should it be installed during renovations, and how can this be done?
Air barriers vs vapour barriers
By Trevor Pringle – 1 April 2019, Build 171
An aura of confusion often exists around air and vapour barriers. So, what are they, what do they do and when should we install one or the other?
