Liquid DPM help - existing floor

Discussion in 'Subfloor Preparation' started by James Ayton, Jul 20, 2021.

  1. James Ayton

    James Ayton Member

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    Hello
    I’d like to apply a liquid DPM to the existing floor. Either going to use Blackjack DPM or Sika Rapid DPM.
    The existing floor is made up of concrete, screed, asbestos tiles fixed using bitumen.
    I presume I need to get the tiles removed, but can the liquid DPM laid on top of the existing bitumen coated screed or does it need to go on the concrete?
    Cheers
     
  2. James Ayton

    James Ayton Member

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    Also, the floor is a tad defective where it meets the wall in places. Plan to remove the crumbled screed etc and repair, although what is the best material for repairing?
     
  3. dazlight

    dazlight Super Moderator

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    Take up any tiles
    Grind off loose adhesive & any smoothing compound
    Apply 1 coat of ardex NA screeding compound
    1 coat ardex DPM1c
     
  4. dazlight

    dazlight Super Moderator

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    Repairing deep holes ardex rapid repair A46
     
  5. James Ayton

    James Ayton Member

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    Thanks for the prompt message Dazlight. Due to time and £, is there any liquid DPM on market that would be suitable to go straight on top of the existing screed, rather than having to take off the existing? Cheers
     
  6. dazlight

    dazlight Super Moderator

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    I’ve done uzin PE404 over the top before on a small area.

    what floor covering you putting down ?
     
  7. James Ayton

    James Ayton Member

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    Either luxury vinyl or engineered wood. Cheers
     
  8. dazlight

    dazlight Super Moderator

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    If it’s a floating floor you will have a good chance of it being ok with a Dpm straight over the sub floor. But as I said a coat of smoothing compound 1st
     
  9. James Ayton

    James Ayton Member

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    Cheers may
     
  10. James Ayton

    James Ayton Member

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