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Ply lining over tile mortar?

Discussion in 'Floors, Stairs and Lofts' started by iaingray741, 26 Feb 2017.

  1. iaingray741

    iaingray741

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    Hi all,

    I'm currently renovating my bathroom and have just removed some heavy duty floor tiles. They've left a load of nasty grey mortar that i'm struggling to take off without removing chunks of floorboard with it!!!! The floorboards aren't in great shape below and are flaking up when i get the chisel on the the mortar.

    Im trying to keep the cost down, so I was considering just lining the floor with plywood over the tile mortar. Is that an acceptable practice?

    Would 5.5mm exterior ply be suitable for this? The tiles i removed were about 8mm thick, and i'm just planning on a vinyl floor so height shouldn't be an issue.

    I was planning on screwing it to the existing boards and leaving 1 access hatch for services.

    Any other advice?


    Cheers
    Iain
     
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  3. vinn

    vinn

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    OP,
    Why not post pics of the floor and the room?
    The tiles were stuck to T&G floorboards?
    There are a number of threads on these issues in the tile forum - I'll ask the mods to transfer you.
     
  4. iaingray741

    iaingray741

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    No problem...i'll get some photos.

    Yes, the tiles were pretty hard to get off. Got them off...and now i'm left with the mortar!
     
  5. iaingray741

    iaingray741

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    Floor without the tiles
     

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  7. iaingray741

    iaingray741

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    Chunks coming up from the t&g boards
     

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  8. vinn

    vinn

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    You have a choice:
    1. Hire a floor tile grinder - it will clear that floor in no time. Then use 12mm ply.
    2. Knock down the highest spots and prime and spread a very thin coat - merely a filler - of SLC to give a flat floor over the whole room. Then use 12mm ply.
    3. Using ply straight over what you have might risk crunching sounds in traffic areas, & possibly eventual loosening of the ply.

    Consider the rad supplies, the wastes from fixtures and all pipework below the floor before fixing ply.
     
  9. iaingray741

    iaingray741

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    Cheers mate...I'm going to hire the tile grinder (£18 for the day), so I'll see how that goes.

    Would you out ply over the whole floor? Even under the bath?

    Cheers
     
  10. vinn

    vinn

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    Best practice is for the bathroom to be an empty shell for first fixing etc.
    But if the bath tub is fixed and staying then as a DIY'er just run the ply or whatever up to the bath. - not under it.
    But run ply and finish floor under the WC & ped basin or vanity.

    Depending on the size of the room, its best to do an "easy-fit" template and, using the template, cut the ply in one piece and drop it in place

    Remember that the screws must not penetrate below the sub-floor T&G boards.
     
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