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Old 03-08-2006, 10:21 PM   #1
jdfife
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Kerdi Showers without a Kerdi Drain

Hello,

I've done several showers with Kerdi but have a question on drains. The Schluter web site, Tile Your World and Kerdi Shower books by John B seem to not address a shower done with Kerdi where you don't use a Kerdi drain.

I generally do new construction where the drain is already installed by the plumbers before I get there, and getting all the plumbers in town to switch to Kerdi drains isn't going to happen.

Here's how I've done my showers:
-I've been doing 4mil plastic over the OSB, then chicken wire stapled down, then mud (5 parts sand to 1 part morter).
-I run the mud up to the weep holes in the drain, then slope it off quickly.
-I then run the kerdi over the mud and use clear silicon to attach it to the drain just outside the weep holes.
-When I tile I fill the gap between where the kerdi-covered mud slopes off before the drain (usually 1" deep).

I'm attaching a file with an image of the std Sioux Chief 821 drain I usually encounter, with a cross section of the construction I explained above.

I've been thinking about cutting a donut-shaped piece of kerdi to sandwhich in the drain assembly where the upper portion bolts to the lowest section. There's a groove that's designed for this. Then lift the donut piece out of the way while I build a mud pan, then stick the donut kerdi to the regular kerdi on the pan floor.. Maybe it would help?

Thanks in advance for any help,
Jared
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File Type: pdf Drain Explanation.pdf (21.5 KB, 168 views)
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Old 03-08-2006, 10:29 PM   #2
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Whyever don't you just cut out the drain from the inside and install a Kerdi drain, Jared?

You ever do a leak test with that installation you're doing?

You not in a code compliance jurisdiction of any kind there?
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Old 03-08-2006, 10:32 PM   #3
muskymike
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Hi Jared, what CX said. If you are using it on the floor you have to use the Kerdi drain for it to work properly.
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Old 03-09-2006, 08:54 AM   #4
jdfife
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Thanks guys.. Kerdi drains are $75, which I think is rediculously high and I wasn't overly excited about being a plumber for an hour or so for free.. And I'll have to eat the cost since the builders won't pay for the changed drain. But if that's the only way to do it correctly then I'll spend the time & money. I certainly don't want to have to tear out the showers and re-do them in a few years..

I've done 3 showers this way and haven't leak tested them. I guess I've been a little afraid to introduce a bunch of water not only due to the drain but also to the kerdi-to-kerdi seams. It was probably stupid not to..

Thanks again,
Jared
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Old 03-09-2006, 09:03 AM   #5
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If you've done the Kerdi to Kerdi seams correctly, Jared, they're not going to be a problem at all. You can fill those with water for testing any ol' time you like.

The drain arrangement you're using would trouble me, though. It might even pass a leak test, but depending upon nothing but caulk for a water seal is just never a good long-term solution.

My opinion; worth price charged.
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Old 03-09-2006, 04:22 PM   #6
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Hi Jared,

You're right. Schluter products are high, but you have to understand that they spend bundles of money on reasearch and development and also on training and education. Further, Schluter's product support is second to none.

And the Kerdi-drain really is the only way to go.

And be before my friend Eric gets on me, Noble Company does a good job too.
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