Cement Board over Greenboard


  #1  
Old 10-12-14, 10:59 PM
J
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Cement Board over Greenboard

Hey everyone, I am a new member here and also a first time home buyer. I took on quite the project about a year ago and plan to make a blog about my home remodeling experience. Enough with that though... Here is my dilemma. I am remodeling a bathroom and installed green board against the studs behind the shower tub. I have not decided if I want to tile or use a surround for the shower. After doing some research I have found that I should use cement board as the backing for both tile or a surround. Will I be ok to place the cement board over the green board and then tile/surround?
 
  #2  
Old 10-13-14, 05:38 AM
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Welcome to the forums.

Remove the green board and replace it with 1/2" cement board.
 
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Old 10-13-14, 06:28 AM
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Second opinion. Same. You will have wall/tub convergence problems if you don't.
 
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Old 10-13-14, 09:45 AM
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There is no need for tile board behind a glued on surround.
And there's nothing to gained by using it.
The surround is water proof, tile board is not.
For a far better look, longer lasting, at least three times as thick go with a nail on surround not a glued on.
It gets mounted directly to the studs and green board covers over the flanges.
 
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Old 10-13-14, 09:56 AM
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After doing some searching I plan to tile the surround. The tub is already secured with the green board attached to the studs. My former father in law is the one who was running the show and thought that was the correct way to do it. What if I leave the green board, attach something like a Kerdi membrane, apply cement board over that, and then tile on the cement board? Will this work?
 
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Old 10-13-14, 10:12 AM
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Chandler addressed this in post # 3:

You will have wall/tub convergence problems if you don't.
 
  #7  
Old 10-13-14, 10:26 AM
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How will I have a convergence issue if I run 1/4 backer board down to the lip of the tub?
 
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Old 10-13-14, 10:30 AM
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Maybe we are not thinking of the same thing? I will try to get some pictures and post them this evening.
 
  #9  
Old 10-13-14, 11:17 AM
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1/2" backer board for walls; 1/4" is only ok on the floor.
 
 

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