We are considering moving the bathroom to the adjacent room, which raises (among other things) the question of how the drainage should be connected to the stack that runs in the current bathroom. It would be convenient to be able to do it through the wall under the floor. For an amateur, it sounds highly likely that there is a beam under the wall, which would complicate things somewhat. Can we assume that this is the case, i.e., is it always built that way? (That the beams run parallel to the wall is obvious.) It's an apartment building in Stockholm that was built about 100 years ago. It is a plastered wall, non-load-bearing.
(Of course, it's not worse than opening it up and seeing what it looks like. But I'm curious about how it likely is.)
