ᐅ Interior wall damp from rain

But I don’t do that, the construction company can take care of it.

The construction company will most likely not do this voluntarily; it seems they are already trying to resolve the issue cheaply by other means until the warranty expires. However, the problem could worsen due to impaired ventilation if moisture can no longer escape that way either. A missing waterproofing layer would probably only be expensive to repair afterward—I hope for your sake that it’s something else. I am more inclined to believe in such a systematic workmanship error only if several houses are affected.

Most likely, an expert will eventually have to open up the wall to document the defect. Perhaps the construction company will reconsider and properly fix the issue after all. In any case, I would keep all further communication with the construction company in writing and document the process thoroughly (maybe also take useful photos yourself).

I only do it in writing anyway. Otherwise, they twist your words. Fortunately, due to another matter (unfortunately only), I have retained a small amount from the final invoice. This way, I might be able to apply a bit of pressure.

Bauexperte schrieb:
Hello.


Did "someone" perhaps skip the waterproofing above the first course of bricks ....?

Regards, Bauexperte

In my view, that alone would not necessarily cause the described damage. For example, all the houses in our neighborhood are also waterproofed only below the first course of bricks. However, I suspect that this waterproofing was also "optimized" here (meaning saved on). :-(

If it concerns three houses, I would recommend involving a surveyor right away. You can share the cost among yourselves.

I can only tell you that we have the same problem. However, we have not moved in yet. In our case, the moisture actually came through the ventilation grilles. Our house is also on a slope and tilts to one side. When there was heavy rain, the clay soil loosened and basically clogged the ventilation grilles, allowing a significant amount of water to enter the house. This happened while the building was still in the shell stage. After that, we dried the foundation slab and walls as much as possible and had the plaster and screed installed. Well, now the moisture appears exactly in the lower areas as you described. We already had a professional check it, and it’s clear that the transition from the foundation slab to the wall wasn’t dry enough during plastering and screed installation. Now it is still drawing moisture. We will try to dry it out by heating. In the worst case, a special drying system under the screed will be necessary. Make sure to have it properly inspected!