AlexRex

Yeah tricky, appreciate your input. Older homes always tricky.. what about Battons with rockwool rolls inbetween them with plasterboard to finish? Rockwool is breathable. Otherwise plaster it again (no PB) hearing ventilation issues with old walls and gypsum plaster

Thanks! Yes battens, the next bedroom along same wall just has PB as far as I can see. Suggesting they just wanted to insulate the main room and no penetrating damp issue. Suggesting it’s self inflicted with use of non breathable products? Couple of cm the polyestene

Thanks!

Plasterboard on external solid wall has a musty smell when removing skirting and smelling under it.. it has a foilback, black vapour sheet barrier and polystyrene.. I thought to remove it and put new plasterboard.. however plasterboard onto external wall may cause damp. Do I leave as it is? I’m thinking vapour barrier isn’t breathable so it will always have a musty smell? Thanks