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Unread 03-09-2012, 09:49 AM   #1
Pabs
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proper substrate for kitchen back-splash

Hi all,

my next tile job will be the kitchen back-splash

what is the best substrate to use? cement board?
removing the drywall to install cement is no biggie, already have half gone anyway, I've seen people do it directly over drywall but I'm guessing that would eventually lead to failure.

so is 1/2" cement board the best or is plywood the better choice?
also, would adding a membrane like kerdi be useful or a waste of money in such an application?


thanks

P.S. I tried searching in the forum first but could not find what I was looking for
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Unread 03-09-2012, 09:58 AM   #2
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Pabs, you might wanna try typing backsplash into the Advanced Search feature and asking for Titles. First 500 threads came up on my first try.

Kitchen counter backsplashes are one of the most forgiving of tile installations. Tough to cause much of a failure there, but also easy to install material you'll later wish you hadn't.

Gypsum board is a perfectly acceptable substrate there. CBU is always the better substrate for a ceramic tile installation, but not a requirement in your application.

If drywall would "eventually lead to failure" in such a tile installation, most backsplashes would fail earlier because they were not covered in tile, eh?

You could put a waterproofing membrane on your wall before tiling, but I'm not seeing the advantage. There are gypsum-based tile backer boards with waterproofing surfaces already applied if you really want something like that.

You absolutely do not wanna install plywood there in lieu of the gypsum board or CBU.

My opinion; worth price charged.
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Unread 03-09-2012, 09:58 AM   #3
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This is only a backsplash--won't be walked on or drenched with water. Drywall will be fine. If it is glossy paint, scuff it up with sandpaper, and make sure it is clean.
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Last edited by Pirate; 03-09-2012 at 01:50 PM.
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Unread 03-09-2012, 10:27 AM   #4
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hehe...thanks CX...doesn't take much to throw off a search engine..
might stick to drywall then...easier to work with!

just curious, why can't you use plywood for this kind of application?
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Unread 03-09-2012, 10:46 AM   #5
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You can. I wouldn't. Far less stable than either gypsum board or CBU. Much more inclined to warp a little in that application.

But you can use it if you wanna.
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Unread 03-09-2012, 12:29 PM   #6
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nahh, like I said, drywall will be much easier to handle than ply would... so, since it seems to be fine I will do it that way

thanks for the prompt advice !
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