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MadSciTech t1_j6olk8d wrote

Could your roof be leaking and water is dripping down into the wall?

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carl63_99 t1_j6ome3b wrote

Or seepage from underneath? I would guess some moisture testing to find the source. Fix that, then fix this wall.

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xhurrhurr OP t1_j6on2cz wrote

hold on - I didn't consider that.

The house has a basement underneath but not under the whole house. THe basement is very wet and when it's raining strongly, the water pushes through one of the inner walls. It is exactly below this spot!! And the outside is also inclined towards the house. If puddles build up outside, the water flows right into the wall.

This is actually a pretty good guess, holy shit. I have to think about that.

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