I live in an Altbau DG in Berlin, and while hanging shelving in a utility closet I hit some fairly thin metal behind this hole.
I’m 99% sure it’s not a pipe, because I double checked before I started that I was above the level of the heating and electrical conduits. There are also no roof vents running up through this particular cavity.
It’s ca. 55cm from the floor and ca. 6cm from the joint between the roof and the wall – could it be a piece of metal strapping, maybe, connecting the plasterboard for the roof and wall ? I’m very familiar with modern construction techniques but this is my first time in a building this old.
I’m also at least 30-40cm from the actual exterior of the building itself, so that’s not a concern.
by Pale-Tangerine4465