I've had to do some exploratory & other surgery in the kitchen ceiling (also bathroom floor) as a result of a loose connection in an old junction box (kitchen & bathroom lights went off sometimes but came back on if you stepped on the right area on the bathroom floor). That's all fine now (Wago box; new ceiling light; big mess cleaned up), but I wonder about the weird situation I found in the ceiling/floor.
= bathroom floor
- kitchen ceiling X joist
================================ XX XX XX XX XX XX XX XX XX XX XX XX
--------------------------------
That's a cross-section. There seem to be two sets of joists: one set has a gap above & the (lath & plaster) ceiling attached below; the other has a gap below & the floorboards attached above. I've only worked in the middle, so I don't know how the ends of the joists are attached to the walls.
Any explanation for this weird situation?
Thanks, Adam