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Old 04-28-2010, 02:11 AM   #1
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Cement Board to Green Board Question


In my bathroom that I am building from scratch I have a standard bathtub in place that I am going to surround with tile. The length of the room is around 7 feet and the tub is 5 feet long so I had to build a wall basically on all 3 sides. I used cement board on those 3 walls. Now my question is where the greenboard and the cement board will meet on the back wall is at the outside corner. What is the proper procedure on making this corner right. I am going to be putting a tile boarder piece right up to the corner then the opposite corner will just be regular wall. Would it be right to use a metal or plastic 90 degree corner bead and attach it to the cement board and also to the greenboard? I was thinking that would be the best solution but I am not reallly sure. Any help would be appreciated.
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Old 04-28-2010, 07:41 AM   #2
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Cement Board to Green Board Question


What are you going to use to seal the cement board ?

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Old 04-28-2010, 11:09 AM   #3
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Cement Board to Green Board Question


Do you realize that green board is no longer code approved for areas of high humidity (like bathrooms)?
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Old 04-28-2010, 11:12 AM   #4
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Cement Board to Green Board Question


Drywall can be used under tile, provided it is sealed
Just using cement board over the drywall will not seal it
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Old 04-28-2010, 11:34 AM   #5
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Do you realize that green board is no longer code approved for areas of high humidity (like bathrooms)?
It depends on where you live. In some areas regular drywall is still accepted.
It's code in Arkansas - I've used it but I haven't placed it within 3 feet of the shower, not intentionally - the design plan just worked out that way.
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Old 04-29-2010, 10:48 AM   #6
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Do you realize that green board is no longer code approved for areas of high humidity (like bathrooms)?
So if you cant use green board or regualar drywall... whats that leave?

Shane
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Old 05-12-2010, 06:34 AM   #7
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Cement Board to Green Board Question


I am going to seal it with redgard as I have heard it is a great product.

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What are you going to use to seal the cement board ?
Redgard from Home Depot
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Old 05-12-2010, 06:43 AM   #8
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Is Redgard one of if not the best durock waterproofer before I put the tiles in place? I've heard it is so I plan on using it unless I hear otherwise. Thanks
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Old 05-12-2010, 06:59 AM   #9
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Cement Board to Green Board Question


It is a common one, but not the best. Two issues. One it must be applied perfectly with at least two coats with adequate drying between them. Two: if water does penetrate and it does the grout this product is latex based and will re-emulizify. (Test it.... pour some out, wait a month and place in a glass of water... back to a liquid it will go)

The best method IMHO is to use sheet waterproofing membranes like Kerdi or those from Noble.
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Old 05-12-2010, 10:47 AM   #10
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Cement Board to Green Board Question


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Originally Posted by md2lgyk View Post
Do you realize that green board is no longer code approved for areas of high humidity (like bathrooms)?
Could you please clarify this claim?
Just what do you think people should use above shower surrounds (plastic/acrylic) or if they decide to not tile the ceiling or walls above a tiled shower?

Edit: Around here, people use "green board" to refer to a mold-resistant, moisture resistant drywall (even if it's purple - I used the purple, although apparently another company makes the equivalent in green). Probably sloppy on their part; I'll stop using it. (after the lumber guy told me (a) plywood doesn't expand, and thus (b) it doesn't matter how it's installed relative to the joists, I should have learned my lesson. He was wrong on both counts. I double-check almost everything I'm told now.)

Last edited by lazzlazz; 05-12-2010 at 06:38 PM.
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Old 05-12-2010, 06:29 PM   #11
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Cement Board to Green Board Question


greenboard has been replaced several years okay. Some home centers still sell it due to overstocking, but many areas will not allow it by code. Use mold resistant drywall (denshield) in bathrooms and CBU in wet areas like a shower.

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