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Unread 10-25-2021, 05:43 AM   #1
qwertyjjj
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1/2" difference in height on plywood

I'm reinstalling a new tile floor in a basement.
I put 2x3s frame on the floor but the foundation has a 1/2" difference on one side of the room. Two layers of 5/8 plywood on top.
Is there a modified thinset that I can put this thick or is it better to pour self leveler on the low area on top of the plywood?
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Unread 10-25-2021, 07:39 AM   #2
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Seems to me if you're making a wood frame to support a plywood subfloor over your poured concrete (I'm guessing) basement floor, the simplest method of flattening the floor would be by adjusting this new framing. What am I missing?

While there are thinset mortars that can be applied in the thickness you have in mind, you really, really don't want to try to flatten the tile installation that way. Could be done, of course, but that's not the purpose of those mortars and your chances of doing it effectively are not good.

My opinion; worth price charged.
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Unread 10-25-2021, 10:25 AM   #3
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Would have been but I already did the plywood
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Unread 10-25-2021, 02:17 PM   #4
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Self-leveling cement mortar over well nailed metal lath would be the way to go now. It would have been much easier to level the plywood, though. What did you used to attach the wood strips to the concrete below?
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Unread 10-25-2021, 02:22 PM   #5
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And, is there anything between the wood and the concrete to prevent moisture from the concrete from migrating into the wood? Or, is the wood pressure treated?
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Unread 10-25-2021, 04:17 PM   #6
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Is your plywood now flat, and "just" not level? In other words, just a consistent slope? If so, one option is to just go with it, at this point. The tile doesn't care, as long as it is flat. But, the other questions stil need answering, is there anything to stop moisture from the slab, and is it PT wood? And how it is attached.
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Unread 10-25-2021, 06:44 PM   #7
qwertyjjj
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PT 2x3s attached with concrete screws drilled into the foundation
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Unread 10-25-2021, 08:28 PM   #8
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It's more like a curve down over 4 ft and then up a little tight on the edge
No choice but to put leveling concrete I think...

I wish there was a thinset you're product you could pile on really thick and just level out the tile
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