self-leveler over patch, and vice versa, OK?

Discussion in 'Floor Preparation' started by oneway, Jul 13, 2018.

  1. oneway

    oneway Member

    Are there any issues putting a layer of self-leveler over a layer of patch, or vice versa? What about patch, then self-leveler, then patch on top of that?
  2. Mike Antonetti

    Mike Antonetti I Support TFP Senior Member

    If bonded properly, some leveler wants substrate to have a surface profile of around 3 so smooth doesn’t bond as well. Self leveler needs to be primed for it to flow,cure properly, that the water is not robbed from the patch.

    They could expand and contract at different rates just like ceramic tile and slab, so if it’s thick or larger areas then I would consider calling tech services.
    • Like Like x 1
  3. Mark Brown

    Mark Brown On The Surface Flooring I Support TFP

    I put patch over leveller all the time, there is typically nothing wrong with this.
    • Agree Agree x 1
  4. Mike Antonetti

    Mike Antonetti I Support TFP Senior Member

    Some levelers when you don’t prime they will shrink slightly and lift up off the substrate. Overwatering, fans, large airflow also affects its result, cracking.
  5. kwfloors

    kwfloors Fuzz on the brain Charter Member I Support TFP Senior Member

    The self leveler should be your last deal. I don't see any problem going over patch if you prime it before the self leveler.
  6. Incognito

    Incognito No more Mr. Nice Guy! I Support TFP Senior Member

    How worried I would be layering underlayment material depends on what's going on top.

    One size does not fit all.

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