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House I was helping some mates with recently had a floor like that. Joists where an age apart, 600mm, but there was no nogs/links the other way, someone had just screwed some pine skirting board under the joints on the long side.
Whole floor was super wonky, when we took the carpet up the stuff just crumbled.
Ran nogs every 300 but left the joists where they were and reinforced the edges of the sheets and then the thicker OSB (22 or 24mm?), very solid feeling after.
BrickMan
This is the upstairs floor in a stone built cottage. Any idea how 5his could happen? There’s not much evidence of leaks from the roof either now or historically, although there’s a few small marks.
Most of the top floor is like this. Joists are fine.
I need to replace the floor obviously, I’m guessing with t&g chipboard, but wondering if ply might be better?
Any advice would be appreciated, thank you 🙏