Interior plaster on the exterior wall is not complete

Hello everyone,

we are currently having a house built with a general contractor (exterior wall construction: aerated concrete - mineral wool - clinker). At the moment, the plasterer is working in the house (walls are receiving lime-cement plaster). Some pipes run "surface-mounted" in room corners and are to be later covered with drywall panels (e.g., the exhaust pipe of the gas heating system).
Now, there is no plaster behind these pipes. Aerated concrete is visible (see photo).

So far, I have assumed that the interior plaster represents the "airtight layer" on the exterior walls. For the same reason, among other things, the sockets and switch boxes in the exterior walls were executed with airtight membrane boxes. This is rendered absurd if the interior plaster is missing on a large area behind "surface-mounted" pipes. In my opinion, the drywall cannot take over the function of "airtightness," can it?

The problem with plastering walls behind pipes exists on almost every construction site. How is this usually solved?

That is how it is. Cladding, painter's plaster putty on it, paint or wallpaper.

How is this usually solved?

Plastering before the pipe is attached to the wall, or if necessary, manually applying something behind it later. A typical source of errors in airtightness.

How about Wedi boards as cladding? They are available as angles and are airtight. Costs per pipe depending on width between 20 and 30 €. Better than drywall partition.

Exactly. You take these things. The painter just does it and that's that.

Moin

That just looks good. You definitely can’t create an airtight plane like that. During the BlowerDoor test, it will come back to bite you.



Olli