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Unread 03-24-2014, 11:35 AM   #1
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Hollow sound under Kerdi drain

Last week I installed my Kerdi drain and a mud bed. It's on a slab, so I have no access from underneath. While I was working some of the mud at the back of the shower, I leaned on the drain just a little. Now that it's dry the drain sounds completely solid except for the small portion where I put my hand, maybe a 2x4 inch area. My guess is that the mud got a little more compacted there and is not quite up to the flange.

How would I fix that? Chip enough out to get in there and redo that section?

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Unread 03-24-2014, 11:39 AM   #2
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Welcome, Bob.

Sounds like you have just a very small gap between your drain flange and your deck mud floor. Can you maybe show us a photo of what you see?

If I understand the situation at all, it might be as simple as seeing that the gap fills well when you apply thinset mortar to install your Kerdi membrane.

But I been wrong before.

My opinion; worth price charged.

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Unread 03-24-2014, 12:05 PM   #3
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I'll take a picture of it tonight when I get home. I don't see any difference in the hollow-sounding portion than the rest of it. I can't see it move when I press down on it, but that does seem to make it sound more solid.

I thought about maybe if I were to get some of the mud out of the little trapezoid shaped holes by the spot I could get something under the drain. Not sure what that would be, though.
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Unread 03-24-2014, 04:29 PM   #4
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Here is a picture of my drain. The wood pieces are lying on either side of the hollow sounding area.
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Unread 03-24-2014, 05:23 PM   #5
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Is it out toward the edge of the fabric? Or closer to the inside drain edge? I've had that happen on the inside edge, I believe from not packing my mud all the way in when floating. It didn't cause any movement so I didn't pay it much mind.

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Unread 03-24-2014, 05:24 PM   #6
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Deck mud supports, but does not bond well. Did you use anything different underneath the drain assembly? The common thing is to mix in a bit more Portland cement into the mix for underneath the flange to help bond it well in place.

My take, if it does not flex, the addition of the thinset on top when installing the membrane should hold things in place. You might want to give their tech support line a call and see if they have any suggestions or worries, but I think, if it doesn't move, you'll be okay.
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