I recently chanced upon one of my old technical books, (Notes on the Science of Building) from when I was studying in 1989.
The section that caught my interest was on ‘condensation problems’. This section of the book was actually written in 1964.
It seems that in 1964 it was noticed that impermeable sarking was problematic. This observation was a good one but somehow was forgotten about for the next 55 years.
It probably would have been beneficial had we considered this observation when we started adding insulation to our buildings.
Condensation is not a new problem, we’ve just made it worse.
Check out an excerpt from the NSB chapter in the attached image.
Maybe it’s time to dust off the old books.