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Old cottages get damp, that plus long spans between joists plus non-moisture-resistant chipboard going soft.
In theory 22mm moisture resistant chipboard should span 600mm and won’t swell.
Ply is obviously more stable and water resistance but isn’t tongued and grooved so you’ll have the risk of ridges at the joints.
Don’t fancy floorboarding it? That’d look nice, be more ‘correct’ for the house is much easier to handle and trim than massive sheets and I bet wouldn’t be loads dearer than ply, if it all.
Hefty
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 🙏