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Tileguy
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10,705 Posts
Did you put a moisture barrier behind the cement board on the studs?

Cement board IS NOT waterproof and all of the caulking of joints and seams means nothing if the water can still get into the cement board everywhere else.:)
 

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Tileguy
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10,705 Posts
Yep, moisture barrier behind and going to put Redi guard on the outside prior to applying the tile.
Not a good idea now. The industry recommends against using both at the same time, one or the other but not both. Doing both will create a trap for moisture in the board via condensation.:)
 
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