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Interesting, ta - yep, none of the windows have vents… they’re all lovely wood frame ones so really hope we don’t have to change them out! What do you mean about drainpipes - are you thinking of water ingress from leaking ones? I didn’t think this was rain related given its not been too wet, but it could be.
The most visible place seems to be the rear wall, in red here, and in the (now closed off) fireplace:
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andyfallsoff
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Is the cooker extractor working?
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I had some overflowing gutters and leaking drainpipes. It means when it does rain the wall gets much wetter and it takes months to dry out once it is saturated.
When the house was built it probably had open fireplaces and air bricks in the room. Over the years they get blocked off to get rid of drafts and then moisture has nowhere to go. Or at least that is my theory but I'm not qualified.
pifko
jellybaby
I'm in a 1930 house with similar issues. They are a lot less of a problem with a bit of ventilation (eg open trickle vents in double glazing) and lots of close attention to drainpipes.