At a loss at this wall, the room was skimmed five years ago and then recently a patch of new plaster came off in the middle of the wall.
There was a loose brick next to the patio doors so that this put in properly and the outside wall has recently been repointed. We then had the wall freshly plastered and painted but the damp patch has come back. Any ideas what could be causing it? We’ve noticed a slug there this morning but no idea how it’s getting in