WU concrete - compression during the construction phase

  • Erstellt am 2025-01-04 13:51:08

summoner

2025-01-21 08:34:51
  • #1
Short update:
1. In the next few days, an employee of the "Kellerfirma" will come, look at the new spots, and seal them. We (i.e., the site manager/employees and we as clients) will completely remove the welding membrane (only partially stuck on) and check every exterior wall for any damp "spots." Fortunately, it will rain soon here, or the screed will only be laid in a few months, so until then we can see if water still enters anywhere.

2. After consulting with the site manager, he informed me that he has already contacted the civil engineer: the "Kellerfirma" apparently (sorry, now it gets unprofessional) did not pay attention to something during the concrete pouring, so it was probably difficult to compact the concrete/the concrete was too dry (here I cannot reproduce the exact wording).

3. The expert informed me that he can basically only check whether the "problems" were properly resolved through compaction.
 

summoner

2025-01-21 08:55:36
  • #2
*Vapor barrier, not welding membrane, sorry. Unfortunately, I can't change it anymore
 

derdietmar

2025-01-21 08:57:59
  • #3
Hello,

I think the problem can no longer be solved this way, the concrete itself seems to be permeable (probably of inferior quality). Possibly the [Fugenblech] was also not executed correctly. Who guarantees that all leaking spots were actually sealed? One would probably have to seal all walls across the entire surface.

Therefore, it will no longer be a [weiße Wanne]. The concrete basement must become a [schwarze Wanne]. That means digging everything up, removing insulation, applying bitumen waterproofing against pressurized water, insulating again, and backfilling. Alternatively, demolish and rebuild.

Best regards
 

Allthewayup

2025-01-21 09:21:42
  • #4

That would not work, as there is occasionally stagnant seepage water present – that's how I understood it. The black tank is not sufficient against water pressure for long.

I would insist on contract fulfillment, even if that means demolishing the cellar.

To the affected client: I would ask the expert how he would decide if it were his cellar; that always provides the most honest answer.
 

derdietmar

2025-01-21 10:00:45
  • #5
Hello,

a black tank can indeed be watertight against pressing water. If necessary, the water may also need to be diverted around the building.

Demolition and new construction would, however, probably be the better option.

Best regards
 

summoner

2025-01-21 10:27:53
  • #6
Thank you for your feedback. I think tearing down the house and rebuilding it probably won't work, since the shell is already completely finished.

We will see what happens.
 

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