Soil report for bungalow 140 sqm, additional costs for WU concrete?

Thank you very much for the quick response! Then we will proceed accordingly and now wait for the revised [Bodengutachten].

So a solution "for eternity" for 22,000 EUR or a solution that must be installed and maintained extremely meticulously and can also fail due to external circumstances, for 5,000 EUR. Heavy rain can basically occur almost anywhere, will the drainage still work then? For the water damage, it is enough if it happens once in 20 years...

For a house worth definitely 500,000 EUR, which is supposed to stand for decades...

I wouldn’t risk it...

Yes, if a basement were to be built here, then you could consider drainage or W2.1-E. But even there, it really depends on the terrain. But we are talking about a base slab that lies on the terrain, how is water pressure supposed to build up at all? The water has to run onto the base slab and then back up.

Where is all the water supposed to come from? Also, it’s not enough for a drop of water to get there; it has to stand there for days or weeks. If so much water comes down that it flows onto the base slab from above, then even a WU slab won’t help.

Sure, if the entire property is profiled so that everything runs toward the house, then I could imagine the amounts of water. Or if the terrace has a slope toward the house without a drain. But who does that?

Maybe once in a lifetime you want to upload a cross-section of the terrain with the house?

Certainly! Thank you very much for the info!

Very nice, thank you very much for the cut.

Let's take a closer look at this.

- Top edge of the raw floor at 102.60 m NHN.
- Bottom edge of the floor slab 102.40 NHN.
- Existing terrain 102.46 - 102.02 m NHN.
- Planned terrain 102.45 m NHN.
- Street level 102.16 m NHN.

This means the floor slab ultimately ties into the planned ground by 5 cm. As mentioned before, no water gets under the floor slab (strip foundations). The street is 29 cm lower than the terrain.
You place a drainage gravel strip around the house, which would first have to fill completely with water to reach these 5 cm (part of it always seeps away through the ground of course). This gravel strip empties itself automatically following the slope towards the street.

Of course, it is always easy to write as an uninvolved party, but I would take the risk...

Thank you very much for the explanation! This helps me understand it better! I always had the part about the slope towards the street in mind as well, but we are just laypeople... However, it sounds logical!

Today I asked the next-door neighbor directly if she has any problems with water or moisture... She is in her late 60s and lives there in the parental home, a half-timbered house (!). She denied it, no problems. That of course gives us a little more security... Among the other neighbors around us, with whom we always had a lot of conversations, nothing ever came up in this regard.