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The tile needs thinset to adhere. The barrier doesn't replace that job. http://www.schluter.com/6478.aspx Kerdi faq advises which thinset they recommend to go on top of their barrier, before the tile. Better than the aqua defense, as I didn't find a similar recommendation on their site. Theirs is also a roll on sheet, not a liquid paint on.


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The vapor barrier goes on the blue or greenboard, not behind it. The point if it is that the blue or greenboard is drywall at the end of the day. You don't want moisture hitting it, even if blue/green are more 'water' resistant than normal. see this answer here: What are the pros and cons of adding a vapor barrier behind shower backer board? also google ...



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