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Unread 10-25-2011, 08:25 PM   #1
robinP
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self leveling compound question

I just applied a self leveling compound over my plywood sub floor (product was recommended by a professional tile setter). It was a different brand than the one I had used previously. I just realized that this one called for a primer, which I did not use. I will be using a Ditra membrane over this (applied with modified thinset). My question-have I compromised my tile installation? The area in question is under the washer and dryer so it will not be walked on. If I need to scrape the compound up, I should do it now before it dries completely. What are your thoughts?

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Unread 10-25-2011, 08:33 PM   #2
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That primer is what allows it to bond to the plywood. The way some washing machines shake and rumble I'd be worried.
BTW if you're putting Ditra over a cementitious surface, they call for an un-modified thinset, not modified.
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Unread 10-25-2011, 08:42 PM   #3
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Thanks, Todd. I was afraid of that but hoping the opposite. and you're right about the unmodified over the cementious compound. I had not even considered this so thanks for bringing it to my attention. The rest of the floor is plywood so I should use the modified under the Ditra..correct?

Guess I should go start the scraping. I appreciate the advice!
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Unread 10-25-2011, 08:43 PM   #4
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You need the primer. It is what bonds the self leveling to the plywood. what brand is it?
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Unread 10-25-2011, 08:54 PM   #5
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RS Self Leveling Underlayment. Calls for Levelquick latex primer. This was all the home store had. I'll learn to read the directions. Going to be all night getting this stuff up
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Unread 10-25-2011, 09:00 PM   #6
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That's good SLC. My choice. Good luck.
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Unread 10-25-2011, 09:10 PM   #7
robinP
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Thanks. My first bathroom project. Done other tiling before but was totally unprepared for the intensity of this job! I'm just an older Mom who has always tackled home improvement projects solo. Determined and dedicated to doing it right. I've realized that I missed my calling. Should have been a contractor instead of a teacher! I absolutely love it (even with all the glitches) but thanks to pros like yourself, I've learned a lot.

Back to scraping
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Unread 10-25-2011, 09:13 PM   #8
Toddman
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Ok Robin, breaks over! J/K We're her for ya anytime.
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Unread 10-25-2011, 09:35 PM   #9
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The good part; It should come up easily
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Unread 10-26-2011, 10:06 AM   #10
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Is it necessary to use the metal lath over the primer?

Thanks!
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Unread 10-26-2011, 10:15 AM   #11
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What does the manufacturer of the SLC say about that, Robin?

This is for your bathroom project?
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Unread 10-26-2011, 10:30 AM   #12
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It says to use metal or plastic. The area of concern is under the washer/dryer. Some of the other SLC's don't require a metal screen so was wondering why this product's instructions called for a screen. I'll be using Ditra over the entire bathroom. I am having difficulty getting it up in one small area.. It's definitely bonded..chisel and hammer time, I suppose.
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Unread 10-26-2011, 10:32 AM   #13
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Quote:
was wondering why this product's instructions called for a screen.
Because the manufacturer's product testing engineers overruled the marketing guys and the finance guys listened. Other than that, it's pretty arbitrary...
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Unread 10-26-2011, 10:37 AM   #14
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I hear ya!
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