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Unread 05-28-2008, 04:29 PM   #3
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Join Date: Feb 2008
Posts: 325
No poly, just screw it.
You could use thinset under the cbu, but it's not necessary for a countertop.

You should consider using Ditra instead because it gives you less build-up, and more waterproofing.
You could also use a liquid/bonded surface applied membrane like Kerdi or Redguard for water control.
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