Forgot the wall collar at Kabuflex - how to seal it?

Whether water accumulates under the floor slab or not has nothing to do with the substructure, but rather with how high the design water level is set. Theoretically, during a flood, water stands around and under the house everywhere.

Is the construction more advanced than in your photo? Who is responsible for the sealing? Have you already spoken to the executing trade? If yes, what do they say; if no, why haven’t you addressed it?

The design water level is according to the soil report <= 157.87 m NHN. The outlet of the empty conduit is approximately at 158.28 m NHN. I thought the frost skirt prevents water from getting under the floor slab. How does the frost skirt prevent water from freezing? Our property is on a small hill – I consider flooding rather unlikely. The construction is already somewhat advanced. The bitumen membrane has been glued over the floor slab and the house has been erected. Otherwise, nothing has changed on the ground. The empty conduits were installed by the floor slab contractor. Therefore, I see him as responsible. We have, of course, already informed him but have not yet received any feedback. I wanted to inform myself in advance about what consequences this may have for us or whether it is not as serious as I think.

Now the feedback from the slab builder has arrived. He says we are above the groundwater level, so it can only be rainwater in our case and rainwater is not pressurized. Accordingly, he will not do anything more about it. He also said that in buildings without basements, often not even collar seals are installed at the KG pipes.