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  • 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 🙏


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  • Maybe a bit thin and broken down over time due to footfall.

  • You don't often see evidence of Shredded Wheat's inglorious entry into diy flooring sheets.

  • I did one room in 25mm ply and one room is 22mm osb3. The osb3 was infinitely easier to work with. That looks like 600mm centers?

  • 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.

  • 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.

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