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Unread 11-17-2009, 09:55 AM   #1
doyle0523
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Wall Tile 1/4 or 1/2 backer

Long story short had a good plumber bad tile guy. Tile guy put up 1/4 backer board on my shower wall. (I fired him cause I asked for Dura Rock but he put up Hardie Backer but after much reading on kerdi ....)

Should he have used 1/2 anything else?

My plan now that I have fired him. Is to go ahead with the 1/4 use kedri stuff that is en-route.

If I should use 1/2 can I take down the backer and use plywood if I use the kedri? What kind of plywood?

I had to ask. I have seen some things that say no 1/4 for the wall some people seem to think it is okay.

Thanks.
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Unread 11-17-2009, 10:47 AM   #2
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1/4" isn't sufficient for your walls.

if you're going to use backer board use 1/2"

if you're going to use kerdi use sheetrock.
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Unread 11-17-2009, 10:48 AM   #3
bbcamp
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I think James Hardie says 1/4" is OK for walls, but nobody around here agrees with him on that.

Take down the 1/4" stuff and install 1/2" drywall (the regular stuff, not moisture resistant or mold resistant). Then cover your walls inside the wet zone with Kerdi.
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Unread 11-17-2009, 10:49 AM   #4
Tool Guy - Kg
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Hardi says it's okay on the walls, but I think it's waaaaaay too flexible for the walls.

If you're spending money on Kerdi, I'd go out of my way to prepare it with a 1/2" substrate. Schluter recommends drywall...if you want cement board, I'd switch out to 1/2" Durock.

BTW: It's Kerdi, not Kedri.
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Unread 11-17-2009, 11:14 AM   #5
doyle0523
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Awesome! Thanks. I'll rip it down. I'll just get the sheet rock then.

Sad that I paid the guy for the work. I'll never see that money again.

If I use Dry Wall does it matter which side to use? I heard that if you use the back side you get a better fit with the tile?
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Unread 11-17-2009, 12:24 PM   #6
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Hmmm, never heard of using the other side of drywall for better fit. Finished or white side out is fine. I'm a little anal, so I always primer the drywall for better adhesion of the Kerdi.
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Unread 11-17-2009, 01:30 PM   #7
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Cool. Should I use a Kils primer?
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Unread 11-17-2009, 02:08 PM   #8
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Welcome, Doyle.

Have no idea what you heard about using the back side of the sheetrock to make "the tiles fit better." I'd need a lot of 'splainin' to unnerstan how that would possibly work.

You don't need to prime your sheetrock before installing the Kerdi. It will not improve the adhesion of your thinset mortar.

My opinion; worth price charge.
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Unread 11-17-2009, 09:35 PM   #9
Tool Guy - Kg
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Another chiming in to say "no" to primer. The thinset sticks extremely well to the paper of the drywall....good enough to rip the paper to shreads if you tried removing it after the thinset was cured. The same can't be said in the same scenario, but with a coat of primer on it.

Leave the drywall bare and you'll have a killer bond with the high quality unmodified thinset.
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Unread 12-08-2009, 08:03 AM   #10
doyle0523
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Shower Drain with Ditra and Kerdi Question

Hello,

Do I put the ditra down before or after the drain?

Layered like this from top to bottom:

1. Kerdi
2. Drain
3. Ditra
4. Mud Base

Thanks for the help the other week on the substrate and materials. It's like I had six uncles helping me minus the six pack.
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Unread 12-08-2009, 08:17 AM   #11
scuttlebuttrp
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I assume your building a shower floor?
No need for Ditra in a shower.
Do the drain and mudpan. Then Kerdi attaches to top. Ditra is for the outside the shower horizontal surfaces.
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Unread 12-08-2009, 08:35 AM   #12
Dave Taylor
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Hi Doyle....

What Royce said.... Ditra is used as a tile/stone substrate for floors.... not anywhere within a shower pan construction.

the shower pan order of things are......

1. Kerdi
2. Drain
3. Mud Base with felt and lath as necessary.

I assumed this new thread you have started is related to your original shower project where you asked about Hardi for shower walls.

I combined the two threads to make it easier for those interested to track your project progress.

Hope this helps

PS: We can re-name this thread anything you would like.
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Unread 12-08-2009, 08:41 AM   #13
irish tileguy in michigan
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Doyle, after reading your posts i strongly advise you to purchase the "shower kerdi book", if you go to the top of page and clic on TYWstore you can see it, i think it will help alot with your shower project.
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Unread 12-08-2009, 09:22 AM   #14
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I think Mr. Maloney (Irish Guy) actually wants you to have the Kerdi Shower eBook, Doyle, despite what he called it.

See, it's really cold where he lives, and peoples tend to talk funny and type funny and transpose words and stuff when they's inna cold for long periods, and such.

But we forgive him on accounta we know come July he'll do a lot better.
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Unread 12-08-2009, 09:57 AM   #15
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