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Discuss priming self levelling compound in the Tiling Forum area at TilersForums.co.uk.

  1. David Bingham

    David Bingham New to TilersForums.co.uk

    Location:
    Hertfordshire
  2. Best Answer:
    Post #7 by GaryTheTiler, Nov 19, 2018
  3. GaryTheTiler

    GaryTheTiler Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Stevenage
    I would ,it's good practice
     
  4. GaryTheTiler

    GaryTheTiler Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Stevenage
    3 parts water 1 part primer
     
    • Agree Agree x 2
  5. David Bingham

    David Bingham New to TilersForums.co.uk

    Location:
    Hertfordshire
    Awesome , thanks for the quick reply guys ! how long does the primer need to dry? Before it can be tiled onto?
     
  6. wrighty

    wrighty Professional Tiler

    Location:
    Northumberland
    It's also helpful to prime before you pour levelling compound.
     
    • Agree Agree x 2
  7. David Bingham

    David Bingham New to TilersForums.co.uk

    Location:
    Hertfordshire
    It was poured onto hardiebacker, I was told you didn’t need to prime hardiebacker.
    How long would you leave the primer before tiling onto it?
     
  8. GaryTheTiler

    GaryTheTiler Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Stevenage
    Best Answer
    I was told that it just needs to be touch dry by the tech guys at Tilemaster
     
  9. David Bingham

    David Bingham New to TilersForums.co.uk

    Location:
    Hertfordshire
    That’s what I thought, but thought I would double check. Thanks for the replies guys :)
     
  10. hmtiling

    hmtiling Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Isle of Wight
    I wouldn't tank or level on top of hardie without priming first. Too porous imo
     
    • Agree Agree x 5
  11. David Bingham

    David Bingham New to TilersForums.co.uk

    Location:
    Hertfordshire
    @GaryTheTiler@GaryTheTiler @hmtiling@hmtiling ffs!? is the floor gonna be ok with no primer ?
    I levelled it straight onto to hardiebacker as that’s what I was advised to do?
    I’m meant to be tiling it this Saturday... want to make sure it’s done right and not gonna crack/move . what are my options ?
     
    Last edited: Nov 21, 2018
  12. Paul C.

    Paul C. Trusted Advisor Professional Tiler

    Before panicking, speak to both Hardie and Ultra and get their opinions. Although Hardie always say priming is optional, bear in mind one of its functions is to extract and hold moisture. Ultra recommend priming everything. It says it in the instructions on the bag. So no comeback with them if anything did go wrong.

    Option 1: Risk it (50/50 chance of it might be fine)
    Option 2: Providing the hardie eliminated deflection in the surface, decouple with an anti fracture mat. Personally I'd go with Ditra or Durabase.

    If there are a small amount of isolated hairline cracks, see option 2, or for bigger cracks or in case the leveller has not bonded sufficiently:
    Option 3 and by far the safest option for any scenario: Rip it up and start again. Its only a small area and won't take you too long and with the right priming and leveller, you can crack on within as little as 45 minutes.
     
    • Funny Funny x 1
  13. David Bingham

    David Bingham New to TilersForums.co.uk

    Location:
    Hertfordshire
    Have just spoke to hardie and they say you don’t need to prime it.
    Will ring Ultra in a bit
     
  14. Waluigi

    Waluigi Top Contributor

    Location:
    UK
    I’ll put a tenner on Ultra saying ‘it’s a crime not to prime’
     
    • Like Like x 1
  15. Paul C.

    Paul C. Trusted Advisor Professional Tiler

    If you going on the 100% exact wording, I'll take you up on that bet :)
     
  16. jcrtiling

    jcrtiling Trusted Advisor Professional Tiler TTA Member Top Contributor

    Location:
    Salisbury
    Be aware there is a lot of difference (Sorry to everybody that's heard this before ) between no need to and do not under any circumstances whatsoever prime it . By priming it you may decrease bond strength to hardie. But I would say that bond strength to primed hardie will still be stronger than some other back grounds that you have probably tiled in the past plus also the fact that you will have slowed down the drying process between the levelling and the substrate that probably means it has more time to develop a better bond than if the hardie was just sucking the moisture out of the levelling . I would say if its going to fail it won't be down to this .
     
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