When prepping the floor to tile, I came across what appears to be old wood siding between 2 solid concrete slabs in a doorway.It is about a half inch wide a d runs the width of the opening. A quickcrete patch had been over the wood that came up while scraping the floor. What should I do? Try digging as much out as possible and then add concrete into gap in stages?

  • probably not siding, but the remains of the concrete form
    – jsotola
    Mar 20, 2021 at 23:09
  • seems kind of thin for a form. screed rail perhaps.
    – Jasen
    Mar 21, 2021 at 1:31

2 Answers 2


We don't know how deep the wood goes - it could be an inch, could be 6". But dig down as far as you can. If it's shallow, then concrete will fill up to floor level, which, if you're lucky, will be the same both sides. If it's deeper, dig at least 3" out, and fill as before. If the levels aren't exactly the same, then compensate with more adhesive on the lower side. I'd taper off after a couple of feet if there was a differential of say, 1/4".

  • Thank you. I found the bottom at 6 inches deep.
    – A West
    Mar 22, 2021 at 13:13

Yes, that's exactly what you want to do. I've found that drilling holes, 1/2" since your wood is that thick, into the piece of wood can break it lose and make it easier to remove. Get as much out as possible and then fill in with your Quikrete.

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