Getting clear on vapour barriers and underlays
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.
This website is best viewed on a newer browser than the one you are using. Learn about upgrading your browser (opens in a new window/tab)
Welcome to BRANZ Build. Skip to main content.
Practical how-to articles for builders and designers showing good industry practice and interpretation of the NZ Building Code and standards.
Showing results 1-2 of 2
Do you want to try searching all of BRANZ?
Order by:
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.
By John O’Donnell – 1 April 2005, Build 87
On the surface, profiled metal as a sheet wall cladding should be a straightforward option, after all it’s been used successfully on roofs for years. However, when used on walls it poses its own set of unique challenges.