victor0nl1n3

victor0nl1n3 OP t1_iulw9c5 wrote

Hi! Thanks for your answer.

It's an old house and we don't know much about its foundation.

If the waterproofing wasn't good, wouldn't we have issues on exterior walls too? We would expect rising damp wouldn't we?

Maybe for some reason, water can get under the house and the waterproofing has a leak where we are seeing the humidity issue. How could we test this hypothesis? And what would be a solution?

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