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I had a plumber dig a trench to rough-in a bathroom in my basement. The concrete repair was done fairly poorly. It had areas that bumped up higher than original floor. I had them come back to fix it and they used a grinder to level it.

It's now much better but there are still areas where the concrete patch sits lower than the original foundation floor. It's very minor; maybe 1/8th of an inch in the worst places. I'm planning on using DRIcore style subfloor (2ft x 2ft tongue + groove boards) and when I place one of those on top of some of these problematic areas, the subfloor board teeters a bit when I step over it. So I'm concerned that the floor will not be stable once I install the subfloor boards.

Questions:

  • Can I / should I use something like self-leveling cement to flatten out those areas?

  • Any other products or tips to help me get a smooth, flat and straight cement floor beneath the subfloor?

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    Dricore has small wedges that are used to deal with minor variances in level. – bib Sep 11 '17 at 19:57
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    "Backfill" usually refers to subsoil (or soil in general), not concrete. You shouldn't use self-leveling product, which has a very specific purpose that's not this. You should use a vinyl patch/skim coat and a wide trowel. – isherwood Sep 11 '17 at 19:59
  • Or, get the contractor to do it right. – noybman Sep 15 '17 at 4:29

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