Hmmm we have had repeated water ingress at the edges of a few of our window frames several hours into a storm, which is likely to have wetted the cellulose within the wall cassette (our wall make up inside to out is propassiv OSB, warm cell, wood fibre board, membrane, cross batten, render board, render). I'm now wondering whether I ought to be exposing and checking these areas before we cover them with plasterboard....?