I am refinishing a shower and poured the shower pan using CustomFloat Bedding Mortar several days ago. I mixed it according to the directions (3 Gallons of water per 50Lb bag).

Everything looked fine, however when walked on the pan yesterday the mortar cracked from the wall to the drain in a few places. No additional cracks seem to be developing but I don't think I should tile without first addressing the cracks. Is there anything I can do to repair the mortar before tiling or do I need to rip it out and try again?

-- EDIT -- Added picture enter image description here

  • can you add pictures? Nothing seems overly abnormal about your experience but maybe I am not getting it. – DMoore Jan 4 '17 at 19:25
  • @DMoore Is a cracked top layer fine then? I was under the impression it would translate to cracks in the grout. I'll add pictures. – ks0ze Jan 4 '17 at 19:30
  • Mortar is for the formation of the bed. There should be waterproofing of some sort before the thinset/tiles/grout is applied. There is nothing you are going to do long term to make sure your mortar bed doesn't get cracks. Yours may have shown up because it wasn't fully cured. What are you using for waterproofing and can you zoom out on the picture (where is the drain?)? – DMoore Jan 4 '17 at 19:42
  • @DMoore sorry about the poor quality picture. I'm not at home now and that's the only one I had on my phone. I did a layer of pre-slope, then placed the waterproof shower pan liner link. This is the layer on top of the liner. I thought the next step was thinset/tile with no additional waterproofing. – ks0ze Jan 4 '17 at 19:50
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    If you are 100% confident in the waterproofing underneath then you are done. If you are not you can throw on a couple of layers of redgard down which will also waterproof and will fill in the cracks. – DMoore Jan 4 '17 at 19:52

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