Asked on Oct 10, 2017

What is the best way to fill cracks in a concrete basement floor?

Michelle LeslieMary from IdahoAnnalee Vicari


I'm looking to fill the cracks in my concrete basement floor and then seal it. What is the best way to go about it? Also, previous owners have tried painting it and there are lots of areas where the paint is still strongly adhered.

8 answers
  • Elonsdale54
    on Oct 10, 2017

    You can buy a small tub of hydraulic cement at Home Depot. Need to mix and you put it on the holes and smooth it out. It is also waterproof. Did it on my basement walls. Give it a try
  • We28518635
    on Oct 11, 2017

    the family handiman said to use the foam stuff in a tube but be sure to
    level it right away because when it hardens it becomes almost
    impossible to remove.
  • Steve Woodward
    Steve Woodward
    on Oct 11, 2017

    Make sure you remove the paint as none of the concrete products will bond to the paint. Any remaining paint will contribute to later failures of the bond.
  • Moira
    on Oct 11, 2017

    ARDEX - It's usually an additive to Portland cement. Just google it, you'll see it seals the cracks if they aren't too wide. We will use it on our outdoor porch in spring. Best thing I've seen yet. You mix it in a bucket and squeegie it on. Looks easy and dries fast.
  • Annalee Vicari
    Annalee Vicari
    on Oct 11, 2017

    I worked on the floating bridges of Washington state. To seal the walls we used this stuff called Vandex. It forms crystals when it gets wet. So after applying it, it will only get stronger. I also sealed the cracks of my basement foundation with it because the ground water was leaking in. It worked great. You need to be very careful when you apply it. Follow the manufacturer's instructions to the letter. Read the safety information. It's the best stuff.
  • Mary from Idaho
    Mary from Idaho
    on Oct 12, 2017

    Try using Bondo. It's normally used on automobiles. Works great for your project.
  • Michelle Leslie
    Michelle Leslie
    on Feb 17, 2021

    Hi Beth, You can fill wide cracks with concrete crack filler in a caulk tube. Then you can resurface the slab.

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