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Bathroom floor for tiling on

Discussion in 'Tiling' started by LiamDiggle, 27 Nov 2020.

  1. LiamDiggle

    LiamDiggle

    Joined:
    11 May 2018
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    Country:
    United Kingdom
    Hello

    I'm a DIYer so apologies if I get the terminology wrong etc

    I've started work remodeling my small upstairs bathroom and I am planning to lay down tiles in the main bathroom floor area.

    The existing floor is 22mm Plywood and seems to be in good condition.

    My plan was / is to prep the floor as follows...
    - screw fasten additional 12mm wbp Ply (single sheet)
    - cement in Ditra (using P9 Mapei) uncoupling membrane (I'm using Kerdi Board so went with this)
    - floor tiles on top (10mm trowel), tiles are 450x450

    This will give a total new height to the floor of...
    12mm (ply) + 4mm (Ditra & adhesive) + 11mm (tile and adhesive)... So 27mm total.

    Now I'm thinking I might just ditch the 12mm ply that I've already purchased and just go straight to Ditra and then tile over it. Meaning a new additional height of 15mm.

    What do you reckon? Would 27mm be a big step up / transition? Is the 12mm ply overkill given I've already got 22mm?

    One thing to add - the upstairs in my house is built on engineered trusses (Attic Trusses) running at 600mm centres.

    Any advice / pointers appreciated.

    Liam
     
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