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First of all, thanks for the quick reply!
So I put a magnet near the spot, and it sticks, so there must be nails under there. I'd heard of ghosting before but I don't use candles in my bathroom and I don't smoke so it can't be that. I will definitely put the fan on an overrun timer or if I can, a humidity sensor...
Insulating the whole attic would be way too expensive, especially considering that this problem only occurs in one bathroom, on three nails. Would it be worth it to go check in the attic to see if there's a problem in the insulation between the attic and the bathroom? Could it be that?
Apart from putting the fan on overtime, what else should I try?
Thanks again!
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