Patching a solid floor before self level

Discussion in 'Floors, Stairs and Lofts' started by SUFCDAN, 25 Jul 2020.

  1. SUFCDAN

    SUFCDAN

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    I am going to be self level the floor prior to wood flooring.

    There was a patch that had been done before, it had a few cracks and sounded hollow, so I’ve taken it up, it’s chunks of around 25mm that came up.
    Probably be just under a metre square when all dug up.

    I noticed that the cement that came up had not adhered to the concrete sub floor (the hollow sound)

    I was going to damp it, then an sbr slurry, while tacky fill it in, should I used a 3 to cement mix (sharp sand) and a bit or sbr

    Or should I do a concrete mix, if so can you tell me what to use and mix? Thanks all.
     

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  3. ted456

    ted456

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    It looks like the sand and cement screed is on a dusty soil but you say that its on a concrete sub-floor?
    If its concrete then it needs brushing/vacuuming clean of all sandy bits and the suction taken up with water and a slurry. then 3:1 sand and cement or a 3:1 mix with stone dashings in it.
     
  4. SUFCDAN

    SUFCDAN

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    Yes it’s concrete, it’s a poor bond, is that sharp sand I use 3/1.

    With the slurry some say let it dry overnight some say tacky ? It’s a little confusing.

    Thank you very much for the reply
     
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