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So we've (possibly stupidly) bought a 1910 ish big old house with 450mm ish 'solid' stone wall (stone outer, rubble filler, stone inner as far as I can tell).
Quite a bit of the original plaster is blown in the bedrooms and dining room. Lots starting falling off with steam stripping the wallpaper.
I've read all sorts of horror stories that you should allow the stonework to 'breath' by using breathable plasters - lime etc.. Now... the kitchen area was plastered probably 20+ years ago in a 'modern' bond coat and gypsum skim layer - and it's fine and bits I hacked off when removing the kitchen reveal the stonework to be fine behind as well.
Also, I imagine 5-10 years ago, the lounge and hallway was all boarded in plasterboard and by tapping it suggests that it was dot-and-dabbed on.
Both these appear to be no-no's from reading up, but there appears to be no ill effect at all - no signs of condensation forming on the walls, no sign of suffering to the stonework beneath. The cellar is dry, the walls beneath the elevated timber floors in the back rooms are all bone dry, the timber in the cellar is all dry and solid.
Soooo when renovating the kitchen diner area... why shouldn't I just use gypsum plaster? It appears to have had no ill effects used elsewhere.