How to install the vapor barrier?

  • Erstellt am 2020-07-29 18:56:37

quattro123

2020-07-29 18:56:37
  • #1
Hello,

I am currently in the shell construction phase and the rough plumbing installation is complete. Now the installations will be covered with OSB and drywall.

In the attic, the mason did not build up to the top of the knee wall. This is supposed to be "done" with drywall construction. Profiles like those shown in the picture below have now been installed, and everything behind them is to be insulated with wool. The vapor barrier will then be applied along the profiles down to the floor.

Question: Can this be done this way? I also know it so that the vapor barrier goes down to the ring beam and is fastened there. Will I have problems with thermal bridges here?

Regards
 

Vicky Pedia

2020-07-29 20:00:36
  • #2
So the foil is pulled up to the ring beam and glued there. For this purpose, there is special adhesive from the cartridge. The penetrations of the drywall profiles are sealed with the corresponding tape. The foil has nothing to do with thermal bridges.
 

quattro123

2020-07-29 20:09:23
  • #3
Ok thanks for the answer. Exactly that was the question, is it also professionally correct or unproblematic if I do not pull the foil over the ring beam but along the stud profiles, which can be seen in the picture? Behind it everything will be insulated and on the stud profiles, as usual, the battens/drywall will be installed.
 

quattro123

2020-07-29 20:20:28
  • #4
I must also add that the vapor barrier will then be glued to the raw concrete floor and after that the screed will be laid on top. So there would already be an airtight seal there.
 

quattro123

2020-08-18 13:59:24
  • #5
I want to explain this again with a different picture.

My plan/question is the following: I would install the wool (as it is commonly done) between the rafters.
In the entire area between the wool and the drywall profiles on the right side, I would fill it with Styrodur/Styrofoam and glue the joints. I would then attach the vapor barrier from the outside onto the drywall profiles and extend it down to the floor. Later, the screed will be applied on the floor edge.

This will certainly create some cavities between the wool and the vapor barrier, but in the end, it would still be sealed between the interior living space and the insulation materials.

Is it possible to do it this way? Or is it strongly discouraged? I would appreciate any advice.

If it is not feasible, how would you proceed? I have a step between the ring beam and the wall plate. Should I necessarily build it up higher with masonry? Or can I just fill the step flush with the wall plate using Styrodur and then attach the vapor barrier to the Styrodur?
 

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