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Unread 11-29-2005, 11:52 AM   #1
bhammerstrom
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KERDI-Drain at sloped fill

I'm doing a slate bathroom floor with a drain in the middle and want to keep the system as thin as possible. 3/8" slate o/ Ditra (Kerdi-Banded seams) o/ double 3/4" pwd o/ notched existing joists on a new girder (L/1813).

How thin can I start the sloped fill around the drain. The literature says "the drain casing and bonding flange must be fully supported" and the section shows mortar under these but no mention of thickness that I can see. It looks like about 1/2". I don't imagine it can sit right on the underlayment??

Brad
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Unread 11-29-2005, 11:57 AM   #2
MarcusEngley
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Got to have something under there -- 1/2" is pretty thin, I think. Most of pros here seem to like to see 3/4" minimum. Hang tight for them to chime in...

Think your floor meets deflection specs? L1813! Yikes! You parking cars in this bathroom?
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Unread 11-29-2005, 12:49 PM   #3
bhammerstrom
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Marcus,

Deflection without a girder is L/430, not up to L/720 needed for slate. I could sister to the existing and get L/916. Client is a large man bouncing along in a mortized wheelchair, so prudence is called for, I believe, no?

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Unread 11-29-2005, 01:11 PM   #4
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Definitely -- I was making a joke. If I could get my whole house to L1813, I would, just for fun!
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Unread 11-29-2005, 01:22 PM   #5
Mike2
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Head on over to our Liberry Brad, look for the Kerdi Drain - Rough In article. It should give you all the info you need incl. thickness of mortar bed at drain location.

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