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hvsds
Was it properly ventiliated before? Even if it has a peppperpot type vent cap on the top of the stack it'll need a reasonable size vent in the plaster, I think as close to the floor as poss (sitting just above skirting is a good place?). We're doing up a flat that had that problem, sweaty chim from two 'fake' vents been screwed onto front of plasterboard.
Plasterboard was also mounted direct onto exterior stone and then layer upon layer of it built up to finished room heigh, total disaster. Took it apart and did it properly in September and was dusty dry until last week, mental wrong way wind and driving rain has either dislodged the pots, or exposed a slightly weak bit of flaunching/haunching (?) so started absolutely pissing in. Another job for the poor roof guy :p Thankfully rest of it is fine, an easy job for someone that knows what they are doing and has a big lift machine.