White bathtub transition/joint concrete slab partially unfilled

Hello everyone,

at our terraced house, which is being built by a developer, the concrete was apparently not properly poured when filling the concrete shells, so that you can see the reinforcement and also the joint sealing tape. The whole thing once at 2.5 meters and once at about 40 cm. Attached are a few pictures to help you better visualize it. The green algae layer is currently the groundwater level.

Now the gap is supposedly going to be filled from the outside and then a welding membrane will be applied over the joint. But I am now wondering, is this correct or ... if there is no concrete at the bottom ... where is it then in the wall at all? What alternative options for repair are there? The pit is supposed to be filled in the next 3 weeks. How would you proceed now in terms of securing against consequential damage, etc.?

Thank you very much for your advice!

One can only say: get advice from a specialist ([Gutachter in dieser Fachrichtung]) whether this is okay/will be. In my opinion, it looks bad if there is already water on the joint tape; it will surely come through. And it would also rust away if it is not absolutely tight above it.

from on the road

Hello,

I completely agree with !

A structural engineer specializing in concrete construction should take a look and assess this.

These are precast walls that were only poured on site, right?

If nothing has reached down there yet, I would also have it checked whether the walls themselves are properly filled...

In my layman's opinion, perhaps they didn’t "vibrate" enough or what is the name of the work step where they "poke around" in the freshly poured walls with that vibrating "lance"?

Could it be that the attached insulation panels (picture 2) are already absorbing moisture or is that just a superficial "algae" deposit at the bottom edge?

You should definitely spend "a few euros" on an expert here – the follow-up costs of a damp basement are certainly much higher...

Regards,

D

Hello, with a white tank, it must be cast seamlessly. In addition, a metal upstand at least 10 cm high (so-called joint sheets) must be inserted between the base plate and the wall to make the joint surface between the base plate and the wall (working joint) watertight.

As I see it, this is not the case for you. In my opinion, a clear case for an expert and possibly a construction stop to prevent the dismantling from becoming even more expensive.