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I’d wanna fix this. The ceiling joists will be sitting in that damp.
The chimney stack will be the coldest bit in your loft so condensation could be forming on it and trickling down if the loft is not ventilated well enough. I’d look at that.
I’d also take off a slice of the wet plaster in the bedroom to give it a chance of drying out.
ETA: just reread and you say the stack is dry. I’d still look at ventilating the loft.
There is c. 1 fucktonne of bricks and 0.5 fucktonnes of mortar in a stack so it could just be years of damp in there with nowhere to go to dry out.
Hefty-
Yeah, probably a combination of
- breathable OG plaster being replaced with non-breathable
- chimney being capped off with no ventilation at the top
- fireplace sealed up with no ventilation at the bottom
Once the chimney is capped at the top, the right but slightly depressing thing to do is to remove the chimney breast entirely.
- breathable OG plaster being replaced with non-breathable
Howard
We have something very similar in an upstairs bedroom which remains year-round. Party wall, no pipes in loft, no visible roof leaks, chimney stack in loft is bone dry. I've got no clue