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Unread 09-06-2013, 12:26 AM   #1
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Do I need kerdi with schluter ditra floor?

I am installing schluter ditra as an underlayment for tile in my bathroom. There will be a seam in the middle of the room. Do I need to use the 'kerdi band' to seal the seam? It is the instruction book that comes with the underlayment but not on video. thanks!
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Unread 09-06-2013, 04:27 AM   #2
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Jay, you need to use the band yes if you want the floor area to be waterproof, ditra is waterproof yes but the seams are not. Along the same lines if you want a waterproof floor you would band the wall to floor transition too.

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Unread 09-06-2013, 07:30 AM   #3
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Unread 09-06-2013, 07:52 AM   #4
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Its kind of pointless to waterproof the center of the room and not run the kerdi band up the walls, and attach it to the shower.

We usually waterproof behind the baseboard area.

Someone will come along and whine about the toilet and the doorway, but you can still hold a lot of water on a floor before it hits the doorway.

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Unread 09-06-2013, 08:46 AM   #5
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Perhaps in Houston, Paul, but here where we make our floors level it can be a bit more of an issue.

Not to mention that in Houston, how would a fella even know if one part of his structure was any wetter than another? I've often wondered how y'all know when you have a plumbing leak.

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Unread 09-06-2013, 02:03 PM   #6
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For practical purposes, most people do not need to seam the Ditra. ANy water splashed on the floor in a typical bathroom is usually mopped up, and often isn't much anyway, letting things dry out way before it saturates down, finds that seam and gets to the subflooring. It certainly doesn't hurt, but if you have a toilet leak or some other catastrophic water problem, the fact that that is seamed probably won't make much difference. Your choice, your money.
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