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Old 06-11-2008, 06:28 AM   #1
John K
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Kerdi shower tray video

I believe I have found a error on Schluters site. Click on the first shower tray video and they say to install the tray to the plywood subfloor using dry set mortar.

I have never seen dry set stick very well to plywood...
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Old 06-11-2008, 06:31 AM   #2
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I think the thinset under the tray is for support, and to fill voids. It doesn't have to stick.
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Old 06-11-2008, 07:24 AM   #3
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I have never used the tray, I always mud. It seems like without some latex the tray would lose adhesion and start torquing on the system.
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Old 06-11-2008, 12:39 PM   #4
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The tray absolutely needs to stick, there's nothing else holding it to the subfloor. I am a Versabond guy so I don't have to worry about it.
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Old 06-11-2008, 05:19 PM   #5
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Greg,

That's what I am talking about. The lay person who watches the video and uses dryset on the plywood could possibly have future problems.. No big deal just thought it was a little snafu.
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Old 06-11-2008, 05:52 PM   #6
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bring it up to the Schluter.

call them and ask them if thats the proper way.
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Old 06-11-2008, 08:02 PM   #7
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Nothing else holding it to the subfloor? How about gravity?

What about the mud beds over conventional shower pan liners, just gravity there.
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Old 06-11-2008, 09:09 PM   #8
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I'm pretty sure gravity has a little bit better hold on a mud bed than a polystyrene tray.

From the Schluter website's Kerdi-ST installation instructions:
Quote:
Apply unmodified thin-set mortar to the substrate using a 1/4" x 3/8" (6 mm x 10 mm) square- or U-notched trowel. Place the KERDI-SHOWER-ST, making certain to solidly embed the tray in the mortar. Check the underside of the tray to ensure that full coverage is achieved.
Apparently, Schluter is instructing us to use unmodified to set the tray. If Herr Schluter says it is so, zen eeet must be so. Ya?
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Old 06-11-2008, 09:39 PM   #9
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I have only done one foam tray and I really don't think it was going anywhere once the thing was done.

So far as I can tell gravity has the same hold on everything.

Once that pan is tiled in and the drain is installed nice and tight, it ain't going no where.

However, I don't have much faith in ANY manufacturer really honoring a warranty so I use what I know will work. Just had some great results with custom's marble and granite thinset over ditra. If I could get ditra set period, and for anywhere near the 8.97 I paid for versabond today I would make the switch.
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