28/10/2026
Is it v***r or vapour? And is a v***r barrier actually a vapour control layer? 👀
Lost in translation? North American and New Zealand building science don’t always speak the same language. Get the terminology wrong, and you might get the moisture management wrong, too.
Jon Davies unpacks the terminology confusion, explains why the distinction matters, and why “hope it works” isn’t a moisture management strategy.
Read the full article before things get mouldy: https://www.eboss.co.nz/detailed/pro-clima/accurately-describing-vapour-and-v***r
Image credit: BRANZ
Jon Davies looks at a confusing geographical disconnect when describing vapour control, moisture control, vapour control layers and vapour barriers. Did you know that in North American documents, the term vapour barrier might mean our vapour control layer? And if they do use ‘vapour control layer....