Floating floor subfloor

Discussion in 'Carpenters' Talk' started by Matt Cheesey, Sep 18, 2021.

  1. Matt Cheesey

    Matt Cheesey New Member

    Howdy folk.

    Part way through my floor construction and have myself a question.

    Currently i've levelled my slab. Installed 120mm of PIR and then "attempted" to lay a ply sheet over the top.

    Issue? A 2 cm hump in the sheet that makes the sheet feel like a trampoline.

    I've introduced moisture to the cupped side, put weights on it (250kg) and even tried to reverse the bend to find a nice neutral. None of that worked so I cut a lot of groove 4mm into the 22m sheet... Actually made it worse. Went back down Wickes, bought another one... It's got a 4 inch bow across the board. Facepalm.

    So in a nut shell. I don't like floating ply floors very much! Should I just resort to chipboard as i've got no means to fix it down? Alternatively are some of the cement boards an option? - Just looking to put laminate plank ontop (it's a downstairs WC which is why I went for ply vs chipboard originally.)

  2. BillyBobToo

    BillyBobToo Active Member

  3. stevie22

    stevie22 Screwfix Select

    I would fix 5x2 bearers to the floor using shims to get them dead level, cut your insulation between then fix your ply down solid. Use your grooved sheet and keep t he other for the next job,
  4. Matt Cheesey

    Matt Cheesey New Member

    Really interesting idea. I'd already fixed the PIR down sadly so was not an option. Opted for chipboard instead - much less headache and perfectly flat. Bit of a pain though as I was hoping to have somethign better to fix a toilet to.

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