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It looks great - I’m just dreading doing the rest of the room

Morning ! I’m waiting for the lime plasterers to get back to me. There’s some soil in between some of the stones, which may have made the issue worse but that doesn’t match exactly with where the marks were. I may just keep it as it is now but point it rather than plaster again.

Thanks. I have taken down most of the plaster now - couldn’t see what the cause is/was but I think that the responses and suggestions saying that it may be the wallpaper and gloss contributing to the issue are probably true.

I have no idea how old the plaster is in there but I'm guessing a few decades old - it's also been glossed at some stage so that would trap in any moisture too. Thanks for your inputs!

It's about 2ft thick granite walls. I think you may have a point about the ventilation - it was ventilated but can get extremes of temperature in the winter which I guess must have contributed to the problem.

The photo is in a bedroom - we get loads of rain but the downpipe drains freely so I don't think it's that. Best I get my finger out and hack the plaster off then!

It is, yes. I think I'm going to have to hack it all off :-/

vfr12 - here's some shots of the external wall. I'm not sure what lime was used but it was done to a depth of about 4". irish-spread - there was no furniture in front of the wallpaper but that wall does get the worst of the Cornish weather, although I'm not sure if the cold difference would...

Sorry - I didn't realise that it hadn't uploaded. Here you go:

Hello! I'm new to the group - I have done a plastering course (more than happy to skim walls) but won't be tackling this particular job myself. I have a house here in Cornwall, with 2ft thick granite walls that have recently been lime pointed (about 3 years ago). The wallpaper in one of the...