But install a controlled residential ventilation system?

For example, roofing felt to separate concrete ceiling from masonry. Unfortunately, I have no photo. Sent you link via PM in [grünes Forum]

Thank you for the link - however, we are building with calcium silicate bricks, where the problem is not known to me. In addition, the wall crowns were sealed with mortar, which are poured with concrete.

But good eye

I also built from KS, and my architect specified it. In the photo I posted, you can see gray PVC separation layer between the filigree slabs.

I think that for me there were also static reasons - large spans. It wouldn’t be possible to change that anyway now. In the worst case, you then have cracks in the plaster inside.

Controlled residential ventilation goes in the attic?

Because of the recirculation hood and the DIBT-certified wood stove, we did not have to install either a window contact switch or a differential pressure monitor for the controlled residential ventilation.

@Dirk Which wood stove did you choose?