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Old 01-11-2010, 03:48 PM   #1
glynnbebee
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Redgard on Kerdi?

Can I use Redgard on Schluter Kerdi?

I'm a general contractor installing my first Schluter shower kit and everything was going great, but today someone on the site dropped a trowel in the shower and blew a hole in the floor membrane covering the EPS shower tray. In addition, since this is my first shower, I was also considering using Redgard in the bottom of the shower just for added security against leaks.

Am I crazy? Do I fix Kerdi another way, like with a Kerdi patch on the floor? I'm most nervous about Redgard and Kerdi interacting chemically and reducing long-term durability.

Glynn Bebee
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Old 01-11-2010, 03:50 PM   #2
ddmoit
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Welcome to the forum, Glynn.

A Kerdi patch is definitely the way to go. A 4" diameter patch is required to sufficiently patch a pin hole.

EDIT: As Joe points out in post #5, Kerdi needs a 2" overlap along the perimeter of any breach.
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Old 01-11-2010, 03:50 PM   #3
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Just add a patch of kerdi on the floor, say a 5x5 or larger square or circle. 4" is bare minimum, I like larger. Then cover with cardboard and a sign that says Kerdi repairs $15 each.
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Old 01-11-2010, 04:14 PM   #4
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Thanks!

Thanks for the replies, Dan and Paul. I appreciate the time you took. Heart attack has been averted...

~ glynn
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Old 01-11-2010, 04:19 PM   #5
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To clarify a bit on the size of the patch:

The patch should extend a minimum of 2" at every breach in the Kerdi. So if you made a clean slice barely a 1/16" wide by 6" long you would want a 4" x 10" patch to effect the repair.
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Old 01-11-2010, 04:56 PM   #6
glynnbebee
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Can i test a kerdi shower before tiling?

Thanks for the extra info, Joe. Luckily the slice is much less than 6", and i can thank the Expanded Polystyrene tray for that one!

So i'm reading online that i can flood the shower a bit before tiling to test for leaks? that would be amazing! i just plug the drain and start looking for leaks in the ceiling below? sadly it was just covered today with drywall...

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Old 01-11-2010, 05:04 PM   #7
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Well, it is unlikely to leak. I flood tested the shower I did in my own house. Plug the drain, fill the pan with water, mark the level and wait 24 hours. Only water loss should be to evaporation.

Of course if you start losing water right awy then either the drain isn't plugged right or you really have a leak. Not likely as long as you have the requiste 2" overlap of all seams.
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Old 01-11-2010, 05:06 PM   #8
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Also listen for leaks. Sometimes the drywall sucks up a lot of water before showing signs.
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