See my cluttered room description. Also note the yellow circles that indicate the rooms in my apartment.
In some places (red walls in the picture) in the building, I know that it is double-layer brick with an air gap in between. It is very likely that it is also double brick near my entrance door and the wall section between my WC/living room and the neighbor's living room - but could it just be plaster? (Between my living room/hall and WC, the walls are only plaster and chicken wire, about 9cm thick.)
I want to drill a hole for a wall box and don't want to go through to the neighbor's wall. In the worst case, my wall is 9cm thick. Renovation boxes are 55-65mm deep. Sure, I'll probably manage, but the network outlets I want to make, with slightly longer connections, require a certain depth.
Does anyone here know if it's double brick on all walls separating the apartments? ...as I suspect.
No, it can't just be plaster but it's probably lightweight concrete or slag blocks with plaster on.
If you drill a hole in a thin wall, there's first light plaster, then black plaster. What are slag blocks? The material doesn't really matter, it's the thickness I'm after.
It would have been more enlightening with a real floor plan. You can expect that load-bearing walls and apartment-separating walls are at least full-brick walls (thickness at least 27 cm including plaster layer on both sides). Non-load-bearing partition walls are likely half-brick (15 cm thick including plaster on both sides). Lightweight concrete became more common during the latter part of the 1950s.
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