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Old 10-02-2015, 11:30 AM   #1
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Cement board

I am putting a surround in and put plastic underlayment on then the cement board. Was planning to seal the cement board with Redgard. What will happen if I do that? or is the underlayment of plastic enough?


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Old 10-02-2015, 04:48 PM   #2
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What type? Glue on, Nail on?
Both do not need tile board behind them.
A glued on only needed green board sheet rock no vapor barrier.
Nailed on needed nothing behind it.


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Old 10-02-2015, 08:55 PM   #3
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I think you may have misunderstood Don's question/situation.


It is not recommended that you have both the plastic on the studs and a surface membrane too. The surface membrane would have be better, but too late now. Continue without the Redgard using a good modified thinset to bond the tiles.

Can you give some info on the tiles and the adhesive you plan to use?

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Old 10-28-2015, 01:06 AM   #4
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yea i am a bit confused on the question too. i take it he means a surround for the bath tub/shower?
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