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Unread 01-24-2020, 06:59 AM   #16
Lou_MA
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You said in earlier post that floor can’t be leveled. Are you actually pouring an SLC or are you using a thicker trowel-applied patching compound?
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Unread 01-24-2020, 07:32 AM   #17
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Another SLC Question

I've tried the trowel applied patching compounds before without much luck. Just the other day I tried one, mixed it to the exact water/powder ratio, and the stuff was so thick and unworkable I had to take it up before it hardened (The instructions specifically say: DO NOT ADD MORE WATER).
So I planned to try some SLC hoping that I could get it to fill in the low area realizing the overall floor is not level.
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Unread 01-25-2020, 03:44 PM   #18
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This thread has some good info on self-leveling.

https://www.johnbridge.com/vbulletin...ng#post1525298

I use Ardex Liquid Backer Board for going over a wood subfloor. 6 quarts of water per bag and mix for two minutes straight. Have everything setup ahead of time with the bags ready and the water measured and ready to go for every bag. Once you get going there's no stopping.
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Unread 01-25-2020, 07:01 PM   #19
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Another SLC Question

Thanks for the info. I had already made it about half way through the thread you referenced. I'm planning to use the Henry Liquid Backerboard, only b/c it was available at Home Depot.
We'll see how it goes.
Thanks.
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Unread 01-27-2020, 12:52 PM   #20
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Another SLC Question

OK so now I have a plywood subfloor pretty much covered with SLC. So I presume that non-modified thinset should be used to install Ditra?
I had previously purchased a bag of Ardex X77, I know there is an ongoing debate about whether that product can be used to install Ditra over concrete (SLC in this case) .
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Unread 01-27-2020, 01:39 PM   #21
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What does the manufacturer of your SLC product recommend, Dennis?
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Unread 01-27-2020, 05:31 PM   #22
depawl
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Another SLC Question

No recommendation is given.
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Unread 01-27-2020, 05:50 PM   #23
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Unusual. What's the brand and type?
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Unread 01-28-2020, 05:39 AM   #24
depawl
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Another SLC Question

www.wwhenry.com/wp-content/uploads/2019/06/HENRY-542-Technical-Data.pdf
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Unread 01-28-2020, 08:25 AM   #25
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Quote:
Originally Posted by Dennis
I have a plywood subfloor pretty much covered with SLC.
I've not used that Henry product, Dennis, but if I had a plywood subfloor that was only "pretty much" covered with it I'd want a modified thinset mortar meeting ANSI A118.11 requirements to bond to the floor, including the portions not covered with the SLC material.

As a personal choice, I'd use the modified mortar to install my Ditra anyway for the ease of working with it over a large area as opposed to an un-modified mortar.

My opinion; worth price charged.
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Unread 01-28-2020, 08:47 AM   #26
depawl
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Another SLC Question

Thanks again cx. Just as an fyi, when I said "pretty much" I meant about 90 to 95% covered with SLC.
And just as another fyi, I called Schluter and they recommended non-modified thinset for this application.
So even though I can't seem to find it locally, just to be on the safe side, I'll probably try and get my hands on a bag of one of their mortars.
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