Self-leveler over spongy hardwood

Discussion in 'Hardwood and Laminates Q&A' started by TwoStar, Jan 8, 2015.

  1. TwoStar

    TwoStar Maybe Three

    So...I'm putting laminate over an old crappy hardwood floor and I've got a dip in the floor about a 1/2" deep at the lowest point and about 6 feet around. I am not very experienced with self-leveler, which would be the easiest way to fix this problem, but am worried about the sponginess of this floor.

    Is there anymore info you need? Suggestions?
  2. Dan Schultz

    Dan Schultz Certified Wood Floor Inspector Charter Member

    1/2" in six feet? Spongy you say? This one may need to be fixed from below instead of from the top. I'd say at least have a looksee.
  3. Steve Forbo

    Steve Forbo Pro Member

    Cut out the area, replace with 3/4 plywood. If the joists need to be sistered, then you get it from underneath.
    Sounds like something is going on structurally to cause such a huge dip in a small area.
  4. Floored by Newman

    Floored by Newman Floored by Newman

    I would not use a SLC on a floor with flex. I agree with Dan... Maybe 1/2 -3/4 underlayment would be the solution?
  5. TwoStar

    TwoStar Maybe Three

    The joist system seems ok albeit way out of whack(not flat). I think the problem is in how the hardwood is nailed down or maybe the 1x's that are nailed to the joists. I didn't mean to infer that the floor was a bouncy mess.

    I am leaning towards cutting out the hardwood, and rebuilding the floor from the ground up, so to speak.

    If you have any more insights between now and next monday, keep 'em coming!
  6. Grant H

    Grant H I'd rather be patting my dog.

    So there's no real movement in this "Spongy" area ?
  7. Steve Forbo

    Steve Forbo Pro Member

    If you take a dry line or long straight edge across the dip, mark all 4 sides where the floor is "flat".....
    After you cut the marked area out, you can then install new...STRAIGHT...2x6's. You can do this with a framing gun and glue, or lag bolting. No need to cut the old sagging ones out..Now that the structure is flat, install the plywood, install the floor....
  8. Mike Antonetti

    Mike Antonetti I Support TFP Senior Member

    If your getting to joists it would be the time to sister the joists with some straight 2x6 glued and screwed alongside. Once you have the authorization to address the problem , customers are more understanding to correct the problem.

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