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    Floor underlay for tiles


    Wanting to tiles the floor. Joist are done, is it better to lay down chipboard/osb/ply. have chip board on site and wondered whether this would work? I am wanting to lay tiles on the floor. What would you put on top of this board? I have heard of Hardie Packer? Also same question for the bathroom area where there's much more moisture. How thick is this layer including the board and anything else. This floor needs to be watertight please. Many thanks

    Asked by Fa on 27th Jan 2021
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    Best Answer

    CSL Tiling Services

    "You can use chipboard.On top of this board you don't need to put Hardie backer. I recommend to use decoupling membranes like Schlutter ditra 25, Bal, Mapei Mapeguard UM35, Dural.durabase CI to avoid lateral.movements and cracks after tiling
    All this.membrames can be the shower/ bathroom floor areas. Also for wall waterproofing in the bathroom areas sould use waterproofing membranes like Mapeguard wp200 or Schlutter Kerdi 200 with Kerdi flex tape.The cheapest way for wall waterproofing is Mapegam Ws waterproofing kit. Hope this was helpful"

    Answered on 28th Jan 2021 - Member since Feb 2019 - report
    Karolis Olbutas

    "Depends on what kind of floor your laying tiles. If its wooden and shaky you need to tighten the wooden floor with screws each wooden bit. Then you lay hardy board and screw that as well. Then you lay tiles. If you have the grout all over and there's no holes plus you silicon in some parts the floor underneath will remain dry"

    Answered on 28th Jan 2021 - Member since Oct 2020 - report
    Imperial Refurbishment Limited

    "Hi Fa, best to use for you will be Marin plywood and on top waterproof and crack resistant membrane/Matt."

    Answered on 28th Jan 2021 - Member since Mar 2020 - report
    GM TIling

    "hardie backer mate all day long they come in 6 8 or 10 mm screw down good to go if u tile on ply they will pop and eventually move"

    Answered on 28th Jan 2021 - Member since Oct 2016 - report

    "Ply would be better as not a lot sticks to clipboard then you need detra matting then the tiles you will need to get the adequate adhesive but most tilers get this a trade price same with the matting."

    Answered on 28th Jan 2021 - Member since Feb 2020 - report
    Czs Myers ltd

    "Depends of what type of floor you are gonna be laying. Tiles can also have heat under layer and wooden would all so need under layer"

    Answered on 30th Jan 2021 - Member since Feb 2020 - report
    DTB Bathroom Installations

    "Today ply is a No No for tiling onto as its poor quality and delaminating. All suspended floors should use cement boards to strengthen, put back down original flooring or new osb then using tile adhesive fit cement boards and screw down every 250mm this will add 10mm plus the thickness of the tile installation to the over height of the floor. As for watertight in the shower area and wetrooms a tanking kit should be used."

    Answered on 14th Apr 2021 - Member since Jun 2020 - report

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