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Discuss Dpc Under Hardiebacker in the Tiling Forum area at TilersForums.co.uk.

  1. Ben_A1990

    Ben_A1990 Active Member

    Location:
    Devon
    Hi all

    Please could somebody let me know if a DPC is required with HardieBacker? Taking up the fake wood floors reveals a DPC. Would Hardiebacker under ceramic floor tiles be enough by itself? or do we need a roll of damp course?

    Thanks
     
  2. Plan Tec Tiling

    Plan Tec Tiling Administrator Staff Member Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    Wimborne, Dorset
    Any photos of the subfloor or DPC you referred to?
     
  3. Andystiletiling

    Andystiletiling Professional Tiler

    Location:
    Burnley
    Only a guess as no pic but most laminate wood floors generally have a thin foam membrain laid loose underneath, its more for cushioning than a dpm, if its just that remove it and stick and screw hardi straight onto wood substrate..
     
  4. Plan Tec Tiling

    Plan Tec Tiling Administrator Staff Member Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    Wimborne, Dorset
    He may be referring to bitumen covering on the floor
     
    • Like Like x 1
  5. Andystiletiling

    Andystiletiling Professional Tiler

    Location:
    Burnley
    Never thought of that, hardi wrong choice then if that's the case..
     
    • Like Like x 1
  6. Stef

    Stef Professional Tiler

    Location:
    Cumnock, Ayrshire
    On reading the post I would think that it's the foam under the laminate.
     
    • Like Like x 2
  7. Ben_A1990

    Ben_A1990 Active Member

    Location:
    Devon
    Thanks for all the prompt replies.

    I will take up both flooring later and put up photos, got a few obligations this afternoon. Will be about 8pm, if anybody is online to have a look and reply tonight I would be extremely grateful.

    Cheers

    Ben
     
    • Like Like x 1
  8. timeless john

    timeless john Trusted Advisor Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    North East England
    Can't wait!
     
  9. Ben_A1990

    Ben_A1990 Active Member

    Location:
    Devon
    The green type says DPC (and other things) and is above an old layer of tiles. Seems really solid underneath. This is in the hall.

    The grey one doesnt say anything and is in a garage coversion, doesnt sound as solid underneath.

    Cheers

    DSC_0798.JPG DSC_0799.JPG
     
  10. Chalker

    Chalker Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Tadcaster
    The dpm can be thrown away. But the vinyl tiles will need a different approach
     
  11. Ben_A1990

    Ben_A1990 Active Member

    Location:
    Devon
    Im not an expert in DIY, but they dont seem like vinyl. They are hard.
     
  12. whitebeam

    whitebeam Moderator Staff Member Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Hertfordshire
    They used to heat them when cutting then fix because they were rigid.
     
  13. Ben_A1990

    Ben_A1990 Active Member

    Location:
    Devon
    Just lifted some more of the green stuff out of the way. The edges of some of the tiles have cracked by the skirting board. I am 99% sure they are not vinyl. When I scratch the edge with a screwdriver they create dust and do not peel in any way.

    Going back to the original question. Do I need any DPC under hardie backer with these surfaces?
     
  14. whitebeam

    whitebeam Moderator Staff Member Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Hertfordshire
    The age they are you'd best check there not the ones that contain asbestos.
     
    • Like Like x 1
  15. Plan Tec Tiling

    Plan Tec Tiling Administrator Staff Member Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    Wimborne, Dorset
    No, you don't need any DPM.

    Both floors you have have got laminate foam underlay as @Andystiletiling@Andystiletiling said. This can just be thrown away. I was also right (in a roundabout way!) in that you have old Marley thermoplastic tiles which are stuck down with bitumen (black) adhesive. These are brittle and if they are breaking up near the perimeter then it is a pretty good sign most others will soon follow suit. They usually contain very low grade asbestos but check with your local waste disposal site to check that they accept these, most do in local landfill. Take care when removing for dust etc and most usually come up whole or near whole.

    You don't need hardiebacker from what I have seen, but could benefit from slurry coating over the whole floor where bitumen adhesive is present and tiling that.
     
    • Like Like x 2
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