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Unread 11-27-2020, 02:37 PM   #1
monkeynipz
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When two Slabs meet.. Opinions Collide

Hello,

In my house there is a garage slab and living slab touching. The garage was converted into a kitchen that leads into a living room. I never noticed but there was a grout joint where two the two slabs meet. I have since removed said flooring.

I need some guidance on proper installation around said joint.

I was thinking I start at the joint, working my way off the slab joint. This will leave me with a 6" piece of tile against the hardwood floor living room. This will be the first tile pieces you see when walking into the house.

I was not a big fan of this but so far it is my best looking option.
I was told a few different things from local installers. The worst was "use Schluter Kerdi strip and lay it across the crack." I was baffled .... In what way does this prevent cracking?

The best one, or by the book response recommendation was to lay Ditra down, and continue the movement joint up through the tile.


1st picture - before self leveling
2nd - Filled with spray foam, and then self level - So I can easily remove the self leveler VS the joint getting filled with self leveler.

Thank you all!

I've worked as a tile setter apprentice on off for around 7years, but have never ran into this problem. I will admit, my tiling skill and knowledge are very rusty. This is my personal home, and I've never done more research on a project. I'm used being told what to do!
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Unread 11-27-2020, 02:42 PM   #2
monkeynipz
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BEFORE/AFTER self leveling.

No tile has been set. Just for visuals.
Attached Images
  
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Unread 11-27-2020, 03:52 PM   #3
jadnashua
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This version of KerdiBand is designed to be used over an expansion joint, but you still need to 'honor' the joint up to the surface of the tile https://www.schluter.com/schluter-us...X/p/KERDI_FLEX

Plain Kerdi and Ditra are NOT crack isolation membranes. It looks like you also have another crack in your slab in one of your pictures, so a crack isolation membrane might be a good precaution over the whole thing. Does that crack have both sides even, or are they at different elevations?
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Unread 11-27-2020, 03:56 PM   #4
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Welcome, Jarrod.

I can't tell for sure from the photo, but I would guess that is an actual construction joint rather than just a troweled in control joint. Can you verify that?

Before you did any leveling, could you detect any difference in height of the slabs on either side of that joint?
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Unread 11-27-2020, 03:59 PM   #5
monkeynipz
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Hi,

Thank you for the response!
It seems as it is a trialed joint. A pretty deep one.

The house and attached garage were poured at the same time too.
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Unread 11-27-2020, 09:06 PM   #6
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We need to know about the height difference.
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Unread 11-28-2020, 09:45 AM   #7
CaliGrown
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Safest measure is to honor the joint through and have a soft-joint in the tile. Perhaps the use of a sheet crack iso membrane would allow you to displace the soft-joint to favor your current layout.
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Unread 11-28-2020, 09:50 AM   #8
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That's the reason for my questions about the type of joint, Christopher. If that's actually a construction joint, he's not gonna be able to successfully relocate it in the tile surface using a crack isolation product. If it's a control joint, that might be a possibility.

My opinion; worth price charged.
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Unread 11-28-2020, 11:24 AM   #9
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If you can't determine what kind of joint that it is you'll have to either start the layout on the joint or just start with full at the hardwood and cut a joint in the tile where the cold joint is.

Schluter has some profiles that will work for that but you can also just cut a "grout joint" and fill it with silicone. If you decide to start with full at the hardwood, I like the Schluter option better but I'm not sure why.
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Unread 11-29-2020, 07:27 AM   #10
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If you were a customer I would use the Schluter joint James mentioned because it's going to move and the caulk will have to be touched up periodically.

Since you have experience use caulk, it will match better. Throw a dart at the underlayment, manufacturers wouldn't guarantee it anyway.
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Unread 11-29-2020, 10:00 AM   #11
Davy
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Hi Jarrod. You said that you removed the original tile floor and that they had a grout joint over that crack. Was that grout joint cracked? I would still honor that joint with a caulked joint above it but the previous movement might (might not) give you an indication of future movement.

Not much of a way to prevent it from moving if it decides to do so. To me, giving a little flex to that joint (caulk) is the best thing to do.
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