Perimeter insulation not pinned

  • Erstellt am 2020-11-04 11:03:00

TobSte20

2020-11-04 11:03:00
  • #1
Hello everyone,

our house has been fitted with a basement with a [white tank]. The groundwater level on our property is very high, so this was necessary. We are building with a general contractor.
After the completion of the basement, we commissioned an expert to evaluate the construction work. Our expert pointed out in his report that the perimeter insulation was only partially dowelled, although according to the relevant DIN standards it must be done continuously.
We immediately sent the report to our general contractor and repeatedly requested that the insulation be properly dowelled. However, our general contractor completely ignored this and instead backfilled.

This raises the following questions for me:

- What impacts and consequences can the missing dowelling have?
- How extensive is the effort to retrofit this dowelling, is it even possible? Sheet piles were necessary to keep the groundwater away during the construction of the basement, of course these are no longer there now.
- How should we best deal with our general contractor in this case? After all, common standards were ignored and we pointed out the defect in time (even before backfilling was done).

Thank you for your experiences and assessment.
 

Lumpi_LE

2020-11-04 11:33:38
  • #2
What kind of standard is that supposed to be? (Sollte ja im Bericht stehen) Insulating against the ground by doweling it is quite nonsense, your general contractor must have thought so too.
 

Bookstar

2020-11-04 11:44:13
  • #3
No, that is not nonsense but actually required according to DIN. Especially in a case with groundwater. In the worst case, otherwise the entire insulation will be torn off. BUT: as so often, one thing is theory, the other is practice. According to manufacturer specifications, it must also be fully glued. Has that at least been done? We did not use bitumen or adhesive. It was only dowelled. I didn’t really like it either, since it was not according to regulations. But everything is fine, no problems :). I have also seen other construction sites where it was done the same way. It definitely holds better than just gluing, but I would not have refused bitumen as a second safety measure... I would also say for you, leave it like that. What should be missing now if it is glued, partially dowelled, and already backfilled? Do you maybe have a picture? Then I’ll take another look!
 

TobSte20

2020-11-04 12:22:20
  • #4
DIN 18550 / DIN 13914 Thanks for your detailed answer and assessment. That already helps me a lot, attached is a picture on which our expert has marked where it was dowelled. Unfortunately, not much can be seen. What bothers me the most is that our general contractor simply does not respond at all and will eventually backfill. At the third inquiry, the answer came, "the boards must not be dowelled." Here again, our expert expressly pointed out upon request that this is nonsense.
 

Lumpi_LE

2020-11-04 12:32:09
  • #5
It is not stated there. Can you say according to which one? I still claim that this simply is not true.
 

Bookstar

2020-11-04 12:41:39
  • #6
No, I don't remember anymore. I researched that back then.

Regarding the picture. Well, he went crazy with bitumen. Whether it is glued now? There is hardly any doweling...

If it was filled in layers and properly compacted, I personally would have no concerns.
 

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