Interior wall (vapor barrier) - cladding

Hello everyone,

I have another question about the cladding. In the construction performance description of our selected BT it now says:

Interior walls: 18 mm gypsum plaster fireboard, unfilled 100 mm wooden frame construction 50 mm thermal and sound insulation in the cavity

Is that enough? Or should there be 2x gypsum plaster fireboards on it?
What does that actually mean?

Am I naive to assume that there is also a gypsum plasterboard on the other side of the wall?

Best regards and many thanks,

Hello again,

Correction: I totally got it wrong again - thank God the house is not built yet

The exterior wall has the following construction: plasterboard wall 18mm vapor barrier. The construction is vapor open. According to BT, it is safe to attach dowels and screws to the plasterboard wall. But I have my doubts about that.
The installation level would cost 7,000.

I am now hesitating to install it. I don't really need it everywhere. The kitchen comes to mind spontaneously.

What is the advice of the experts? Or alternatives?

Hello,
if the vapor barrier of the exterior walls is penetrated/damaged at any point, moisture present in the indoor air can enter the insulation of the exterior wall, possibly condense there, and damage the insulation. Mold etc. and so on.
Possible penetrations in the exterior wall:
* Cable boxes etc.
* Cable protection pipes from inside to outside onto the terrace etc.
* Heating pipes for radiators etc.
* Water pipes
If the drywall board is the vapor barrier, i.e. not a PE vapor barrier (foil), then the aforementioned points are not possible, or can only be connected to the vapor barrier with great effort.
Have someone show you the proof of moisture protection of the walls. In a U-value calculation for the wall component, it must be determined whether the component is protected against moisture ingress.
Otherwise, I advise you to bring an independent engineer/energy consultant on board, whom you pay.
Regards

Hi,

Sollte die Gipskartonplatte die Dampfsperre sein,

However, drywall cannot be a vapor barrier.........

Regards