Leveling a Concrete Floor

Bathroom Repair Tutor – Revised 120922 Forums Flooring Leveling a Concrete Floor

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    • #3002

      Hello Steve & Jeff,

      I have pulled up my old Linoleum floor in my basement bathroom.  After removing the adhesive, I found that the concrete had been dug out after the slab was laid to install the plumbing for the bathroom in the basement.  This has left some high-low patches in the concrete as well as pock marks scattered around the floor from the adhesive.  Also, the thin set left over from the old shower pan is difficult to get up.  What suggestions do you have for a floor leveling product/ procedure to use?  Also, any tips for how to remove the old thin set left behind by the old shower pan?


    • #3005
      Steve White

      Hey Kayse,

      Thanks for posting.

      So the best tool to flatten out the leftover thinset is to use a grinder wheel like this dewalt one:


      This is a fairly dusty thing to use…..so have a shop vac near by and/or  purchase  a dust guard for it. https://amzn.to/2GS3kf7

      Minor low spots. I would recommend using a floor patch like this:


      If its really bad and  you don’t think simply patching areas will work, you could floor level the entire bath if you can afford the space.

      Normally you want to have a minimum 1/4″ when floating the floor with leveler, anything thinner will make it tough to spread.

      I really like leveler from ARDEX, but most levelers at the box stores work great if mixed to specifications.

      It sounds like grinding and patching might be all you need though And if the low spots are under a 1/4″  I would simply fill with thinset when installing schluter ditra. (if that’s what you plan to use for under tile)


      Any pictures could help to evaluate the situation.



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