I'm removing all the tile in a bathroom. While removing though, I believe it's the underlayment is coming up with some of the tiles. I was wondering what are the reprecussions of this.

Picture: enter image description here

  1. Does this matter? Can I still lay tile on top of this even though it's coming up?
  2. Can I repair the underlayment? If so, how?

A lot of the articles online for #2 are for water damage. This isn't the case for me.

Thanks, Justin W.

1 Answer 1


You need to tile over a solid surface. Needless to say, this stuff doesn't count, so you'll need to remove it. With a wooden subfloor, the preferred tile base is cementboard. Screw it down, mortar the seams, and go to town with your tiles.


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