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Can I place 1/2 in. Backer board in place of green or do I need to put the backer board on top of the green board?
 

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Never put tile board over any sheetrock.
 

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and if it is going around a tub or shower you don't want any kind of drywall on the walls unless you are using kerdi to waterproof it. you will still need to use some type of waterproofing with the backerboard.
 

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Really need more info what is it you are trying to do and is this in a shower, bathroom wall? are you installing tile?
 
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