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Old 01-05-2009, 03:50 PM   #1
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Help with bathroom shower tile.


I have a one piece shower and like on a previous post I have water damage and a small amouont of mold above the plastic. I am going to rip out the drywall above the shower and tile up to the ceiling. Should I use cement board? How do you cut cement board? Can you just score and break it? Also, Can you just screw right thru the board or do you have to pre drill? One last question, I figure I would need moisture barrier behind the cement board what is the best for that? Thanks a bunch.

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Old 01-05-2009, 04:20 PM   #2
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Help with bathroom shower tile.


You can use DensShield tile backer. It's the same concept as CBU but it's lighter and cuts easier (just like drywall). You're not "settling" by using this product. It's made for tile.
Use alkali-resistant screws to install, no predrilling required. Sink the screw head just below the surface, like you would with regular drywall. Use alkali-resistant tape and thinset over the seams. I'd recommend waterproofing the material at this point. Since it doesn't sound like a large area, you could probably get away with using the small bucket of RedGard. It installs like paint (pay close attention to the corners). Let dry. Tile. Grout. Caulk (not grout) seams between bottom row of tiles and surround and top row of tiles to ceiling. Done.

If you use the RedGard, no need for a vapor barrier behind the backer board.

http://www.custombuildingproducts.co...s/RedGard.aspx
Available at Home Depot

http://www.gp.com/build/product.aspx?pid=4684
Available at Menards or Lowes....called DensGuard at Lowes, same stuff.

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Old 01-05-2009, 04:21 PM   #3
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Help with bathroom shower tile.


Quote:
Originally Posted by dafonz View Post
I have a one piece shower and like on a previous post I have water damage and a small amouont of mold above the plastic. I am going to rip out the drywall above the shower and tile up to the ceiling. Should I use cement board?
Yes, definately no sheetrock behind shower tile. Use 1/2" cement board.
How do you cut cement board? Can you just score and break it?
You can score and break it, but I prefer a circular saw with an abrasive masonry blade. Cleaner cuts that way.
Also, Can you just screw right thru the board or do you have to pre drill?
No need to pre-drill. Use backerboard screws, not sheetrock or deck screws.
One last question, I figure I would need moisture barrier behind the cement board what is the best for that?
Yes, you need a moisture barrier. It is best to put that barrier on the wet side of the backerboard. RedGuard is a paint-on product that is awesome and is for sealing that backerboard up. Kerdi is a more expensive option that is even better. Some people put plastic behind the backerboard instead, and that just allows moisture into the wall spaces...Not the best way to do it.
Thanks a bunch.
Also, don't forget that you must tape the backerboard seams (before sealing) with backerboard mesh tape and you must mud the seams using thinset mortar. Your tiles should be set with thinset mortar as well, not mastic. I'd suggest avoiding the pre-mixed thinset.
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Old 01-05-2009, 04:22 PM   #4
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Help with bathroom shower tile.


Darned Angus beat me to it!
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Old 01-05-2009, 06:19 PM   #5
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Help with bathroom shower tile.


i used this product for a shower install with tiles. i got good installation use and warrenty info from denshield's own website.

according to the manufacturer, the seams do NOT have to be waterproofed either unless you are building a steam shower. but better safe than sorry i always say.

i documented every step of my project, you can find it here

my shower project, denshield backerboard, tiled walls

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Old 01-05-2009, 08:32 PM   #6
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Help with bathroom shower tile.


If you don't want mold, you'll waterproof.

Just a few years ago, it's was "acceptable" by manufacturers to use greenboard. We all know that was a complete joke. Greenboard did nothing to help with mold.

So the moral is, just because it's minimum spec, doesn't mean it's good enough.
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Old 01-06-2009, 10:00 AM   #7
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Help with bathroom shower tile.


thanks for all the replies! The DensShield product looks like the way to go. Thanks Again!!

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