I am putting a curb in my shower using small cinder blocks. Do I need to fill the holes with cement before tiling?

  • 2
    are the openings in the blocks on top or on side? – jsotola Apr 7 '20 at 0:12
  • Are you covering the holes in the block with anything (e.g. cement board)? You need support under the tiles... – Jimmy Fix-it Apr 7 '20 at 5:20
  • A photo may be helpful here or the dimensions I can’t think of any small cinder blocks off the top of my head. Structural brick with the holes would not need filling but cynder blocks normally would. – Ed Beal Apr 7 '20 at 7:00

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