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Unread 09-30-2019, 08:31 PM   #14
cx
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Join Date: Jul 2001
Location: Boerne, Texas
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Zane, the ceramic tile industry standard for flatness for tiles that size is no deviation from intended plane of more than 1/8th" in ten feet nor 1/16th" in two feet. That's a very, very flat surface and you'll be glad to have it come time to set those tiles.

I'll also recommend you consider using a sheet-type waterproofing membrane so you can eliminate the potential "speed bumps" we see so many folks produce when filling and taping the seams in their CBU.

My opinion; worth price charged.
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