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Unread 09-12-2019, 04:08 AM   #1
M.Audette
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SLC install, flat not level

Im wondering how much trouble I'll run into trying to install SLC flat but not level??

I've got a 425 sq ft kitchen floor that is kind of a long and narrow room, 13 x 33 and its 1 1/4" out of level in the 13' direction.

I'm following TCNA RH123-19 guidelines as I have Hydronic tubing on my floor and my average thickness is 7/8".

I have set grade pins every 3' and hope to pour it out of level but flat.

Is there anything I can do to "help" it not try to seek level and stay flat??

My thoughts were to stay at the low end of the range of water added, but I'm concerned that'll quicken the set.

Any thoughts??
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Unread 09-12-2019, 04:14 AM   #2
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I think you’re asking for trouble. What about floating the floor with dry pack?
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Unread 09-12-2019, 04:52 AM   #3
Davy
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I'm with Lou, use deck mud.
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Unread 09-12-2019, 05:14 AM   #4
M.Audette
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Can I lay deck mud 7/8" and still be ok??
I thought I needed a much thicker bed?
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Unread 09-12-2019, 05:25 AM   #5
M.Audette
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The only TCNA method I see for Hydronic over plywood uses an unbonded mud bed with a 1 1/4" minimum bed.

Has anyone used a bonded mud bed with hydronic before??
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Unread 09-12-2019, 12:34 PM   #6
diddly
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Are you saying you installed the hydronic tubing directly over a plywood subfloor and now you have to do something to get it ready to apply tile ?

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Unread 09-12-2019, 01:08 PM   #7
ceramictec
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I think you will have a hard time using SLC “self leveling cement” flat and not level mixing it per manufacturers instructions
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Unread 09-12-2019, 01:45 PM   #8
M.Audette
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Bookie,

I primed the subfloor with NXT Primer, then installed plastic lath as per TCNA's recommendation, then installed the 5/16" Pex tubing over that.
Because of a doorway leading into the living room, I have 7/8" - 1" available for either SLC or dry pack.

I'm trying to follow TCNA's guidelines and because of height restraints it looks like the SLC is the way.

I've just never installed it purposely out of level ??

I agree that its not the best case scenario, but don't have any options that I can see.
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Unread 09-12-2019, 01:48 PM   #9
M.Audette
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Brian,

I agree with you.

But, I know one of my first attempts with SLC without a guage rake or grade pins, came out fairly wavy.

I'm hoping to coax it to follow my grade pins that are flat, but not level
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Unread 09-12-2019, 03:00 PM   #10
Lou_MA
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If you need to go thicker with deck mud to meet tcna specs, I’d do that and just use a threshold or similar to deal with any transiton to adjacent flooring.

With the cost and labor of SLC, I wouldn’t use it outside its intended application. Not to mention the absolute pain in the ass it would be to grind down or bust out a SLC job gone wrong, especially with that SF.
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Unread 09-13-2019, 07:35 PM   #11
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Mapei, and probably others, make a mortar that is thixotropic...it flows when you agitate it, but stays where you put it when done. It can be used to make a ramp. http://www.mapei.com/public/COM/line...b3_02-2013.pdf
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Unread 09-14-2019, 11:07 AM   #12
Davy
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Marc, a couple things to consider. Have you compared the cost difference? Also, dry pack will give you more time than SLC.
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Unread 09-16-2019, 02:10 PM   #13
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thixotropic - there is a word of the day if I ever saw one.
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