SheepGoesBaaaa t1_j68i6cp wrote
Do you have working trickle vents on those windows? It can be just condensation. I had no issues in my house until I sealed up gaps around old windows. Turns out the gaps were incidentally providing air flow. Got mould inside of 3 weeks.
JJJupes OP t1_j68slcn wrote
No and it is condensation based. I have a window vac that takes care of the water to deal with it.
SheepGoesBaaaa t1_j6a2ss4 wrote
Yeah but that's not stopping the condensation in the first place. You see the condensation on the windows because glass isn't porous. Your walls will be soaking it up, and it's harder to see.
Clean it off with vinegar/bleach/mould spray (mould spray is usually just diluted bleach), crack a window a fraction, and turn the heat up. A dehumidifier will help in the first few days or so to help dry it out - but you have a wider problem. I know because I have the exact same problem as I've said with my bay window. The gaps around the old seals were acting as trickle vents and I got mould the moment I sealed them up.
It's the hardest thing to do in a house in the winter - keep it warm but also provide enough airflow
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