Correct installation of a vapor barrier

  • Erstellt am 2019-01-22 09:26:24

thomas.brueck

2019-01-22 09:26:24
  • #1
Hello,

it is quite possible that the topic also fits into the category of defects, please move it if necessary, but it should also fit here.
Situation: Bungalow built 2 years ago, with a cold roof and suspended ceiling. Private expert report has recorded countless defects, contractor bankrupt. My concern now is to get a sense of what really needs to be done, or what constitutes a reason for price reduction in a later sale. The question now is whether we have to have the defect remedied at short notice, or leave it as it is and point out during the sale that the execution was not professional and grant a price reduction.

One defect mentioned by the expert is the missing counter battens at the vapor barrier. I have attached a photo from the construction period. Regarding the installation situation: The vapor barrier seems to be laid partly across several rooms, therefore "voids" above the ring beam were stuffed with insulating wool. Otherwise, there is a suspended drywall ceiling underneath. The U-profiles were screwed to the ring beam.
Maybe someone can answer the following questions for me:

1) Does a vapor barrier *have to be laid per room*, or is it permissible, as the subcontractor did, to lay it across several rooms?
=> Am I correct in assuming that the barrier cannot be airtight at all because, due to the cross-room installation above the ring beam, no bonding could have taken place? (In the photo I only see that he glued the foil to the ring beam *within* the room, but he must have necessarily cut out the masonry crown area.)

2) *Does* a vapor barrier have to be secured with counter battens or is support by the U-profiles sufficient?
=> You can already see that the vapor barrier is pressed onto the profiles by the installed insulating wool. The risk is obviously high that the screws introduced when screwing the drywall or hanging a lamp will damage the foil. The implementation is of course bad, but I want to know whether he *had to* do it differently.

I already had a specialist company here who also said that the way of bonding and support is catastrophic, but nothing can be improved from above and therefore the entire ceiling would have to be completely removed. Costs approx. 12,000 EUR for 150 sqm. I almost believe that this price is not even sufficient.
Since we have already sunk over 15,000 EUR in an evidence procedure, which no longer benefits us much because the main contractor is insolvent, we are now trying to have the warranty claims assigned to us by the insolvency administrator. If that succeeds, I am considering hiring the drywall installer here again, but I cannot afford a separate procedure again. Since our private expert report has already identified the defect with the counter battens once, I hope that someone can give me a tip so that I can counter the subcontractor immediately. References to DIN standards or indications of what corresponds to professional execution would be helpful.

 

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