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Unread 10-16-2020, 08:57 AM   #4
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Join Date: Jul 2005
Location: Fairfax, Va
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If the cement board doesn't have a rolled on water proof coating the unmodified mortar should be just fine. Might double check your tile though, some manufacturers want their tile adhered with modified.

Also check the age of the mortar you currently have, and if the bag has been already opened for a while.
If I recall correctly my memory is excellent, but my ability to access it is intermittent.
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