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I've just removed some super old tiles from my bathroom floor.

Most of the now exposed concrete is in decent condition. However the cement is a little soft / sandy around the drain area (it's an old terraced house with extension over drain).

I'm laying tile backer boards over the floor before the tiles.

What should I do about this slight sandy area. Would it be ok to level with tile adhesive or should I try something else.

Pictures

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  • By "the adhesive" do you mean thinset mortar? How deep is the decomposing concrete? – isherwood Mar 20 at 19:43
  • Added some images – Jenny Blunt Mar 21 at 0:00
  • And updated text - meant: tile adhesive – Jenny Blunt Mar 21 at 0:07
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You have to get rid of the sandy area/sand. If there is just a thin layer and you have solid flooring under you can use a filler like a floor leveler - there are other options but I would need to see pictures. If there is a thick layer or no solid flooring you are going to have to pour concrete or frame (which may be impossible).

There are solutions like floating a floor over the sand but these would break down over time - probably a lot faster than you think. This is maybe an alternative in some climates and some situations.

  • Thanks for this! I'll get some pictures taken tomorrow. – Jenny Blunt Mar 20 at 22:52
  • Added a couple of images – Jenny Blunt Mar 21 at 0:00
  • Can you clean up the sand then take pictures? It is hard to tell what is loose or solid in them. From what I see it doesn't seem that bad but want to be sure. – DMoore Mar 21 at 3:03
  • That’s about it. The rest is ok. The depth of the recess is about 50mm max. – Jenny Blunt Mar 22 at 0:03
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I will clean and pour concrete if necessary I also will add fiber to concrete or solution to make it stronger. You need a solid foundation to begin.

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