Schluter Shower Pan

 
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Old 03-20-2011, 09:07 PM   #1
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Schluter Shower Pan


why in the installation videos schluter tells you to use dryset mortar to install their foam pan and curb? Why would you not use modified?
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Old 03-20-2011, 09:08 PM   #2
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Re: Schluter Shower Pan


Depends what the substrate is. If it's plywood, I've been told by Herr Schluter you can use modified. If it's over concrete, use non.

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Old 03-20-2011, 09:31 PM   #3
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Re: Schluter Shower Pan


Not for the foam Angus. You're supposed to use regular dry set unmodified over plywood. You're thinking of Ditra.

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Old 03-20-2011, 09:36 PM   #4
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Re: Schluter Shower Pan


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Originally Posted by JazMan View Post
Not for the foam Angus. You're supposed to use regular dry set unmodified over plywood. You're thinking of Ditra.

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No Jaz. I asked this exact question to my rep and that was his answer.
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Old 03-20-2011, 10:00 PM   #5
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Re: Schluter Shower Pan


And so......? Their videos and handbook say otherwise.

I agree that modified makes sense, and I always questioned that in my mind, but since I have no plans to use the tray I didn't investigate further. I see no problem using modified, but I'm gonna believe the videos and handbook over what one person may have said.

I suppose I should check into it tomorrow.

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Old 03-20-2011, 10:04 PM   #6
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Re: Schluter Shower Pan


is there a minimum tile size for the schluter tray?
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Old 03-20-2011, 10:05 PM   #7
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Re: Schluter Shower Pan


I would assume you and I have the same rep so I would hope you would get the same reply.

I asked Chad in the summer of '09. That was his reply to me and I have been using that formula since.
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Old 03-20-2011, 10:09 PM   #8
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Re: Schluter Shower Pan


Quote:
Originally Posted by bluebird5 View Post
is there a minimum tile size for the schluter tray?

There is no size limitations. Although, there are certain materials you might not be able to use based off setting material recommendations. You need to set the tile with non-modified.
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Old 03-21-2011, 09:22 AM   #9
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Re: Schluter Shower Pan


Does Non Modified Thin Set even stick to plywood?

How could they spec Modified with Ditra and Non Modified with the foam pan...

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Old 03-21-2011, 10:33 AM   #10
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Re: Schluter Shower Pan


Quote:
Does Non Modified Thin Set even stick to plywood?
Absolutely it does.

Quote:
How could they spec Modified with Ditra and Non Modified with the foam pan...
The two are a different situation. The need for modified under Ditra is obvious. I think Schluter thinks non mod solves the curing aspect while still supplying plenty of bond power to do the job.

Remember non modified mortars were used for many years to set porcelain tile until modified thin sets came along in the '70's.

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Old 03-21-2011, 10:39 AM   #11
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Re: Schluter Shower Pan


non modified sticks to plywood?

not very well I would imagine.

does any cement product that isnt modified in any manner really stick to wood? I use a piece of ply wood to rid myself of cement based products quickly.......why because it doesn't stick, I can scoop it off no problem the next day.

boogers stick to plywood too Im not about adhere to tile with it though.
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Old 03-21-2011, 10:42 AM   #12
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Re: Schluter Shower Pan


most mfg. of setting materials and ANSI Standards would say ANSI 118.11 (modified) to plywood.

I thought there was a Min. tile size for the tray of 2"..
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Old 03-21-2011, 10:48 AM   #13
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Re: Schluter Shower Pan


Hey Jazz-

Have you used DITRA Set before? Just curious because it is available at my supplier as well as the additive. You seem to be very loyal to the Schluter products so I figured I would ask. I am considering using it on my next install. Can this product (with the additive) be installed over OSB. I have not seen a manufacturer give this blessing yet. Thanks.
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Old 03-21-2011, 10:52 AM   #14
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Re: Schluter Shower Pan


There is not a 2" restriction for the pan, only Ditra.

Like I said, I've been setting the foam pan and curb over EGP with modified. A 24 hour wait has been sufficient for a cure and substantial bond. I use Kerabond + Keralastic for my modified thinset.

I guess I'm a rebel like that

This just goes to show the continued issue with Schluter support; inconsistent information. I'm not making this up. My rep told me in July '09 that setting the foam Kerdi shower pan with modified thinset over a properly structured exterior glue plywood base is acceptable.
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Old 03-21-2011, 11:53 AM   #15
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Re: Schluter Shower Pan


Bastien,

Quote:
non modified sticks to plywood?

not very well I would imagine.
Yes it sticks to plywood. Not good enough to bond tiles to it, but that is not the subject here.

Brian,

Quote:
Have you used DITRA Set before?
Yes of course. We've been lucky that a Schluter distributor added several Hydroment lines 5-6 years ago. They have now dropped it but there's plenty of quality non modified mortars available to set tiles onto Ditra & Kerdi to.

Quote:
Can this product (with the additive) be installed over OSB. I have not seen a manufacturer give this blessing yet.
You can use any modified thin set to install Ditra over OSB. The "not on OSB" warning is in regards to the installation of tiles on OSB. (Big difference.) That of course will not work and is not recommended by anyone.

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Old 06-08-2017, 08:33 AM   #16
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Re: Schluter Shower Pan


Hi, I was looking for the answer to this question, modified or unmodified for shower tray on plywood, so came across this thread. I finally decided to call Schluter today and asked. They said without hesitation, use modified over plywood, just to set the tray, everything above (orange cloth and tile) unmodified.

Hope this helps, it's been a nagging question I've had since watching the video's (just didn't square that the ditra used modified and shower tray didn't). BTW if you have a question about Schluter products, call their customer service, they seem quite willing and able to help.

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