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Unread 05-23-2020, 08:24 AM   #3
Kman
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Join Date: Nov 2006
Location: NW Arkansas, Ozark Mountains
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Welcome to the forum, Ron.

Assuming the joists below will support a tile installation, the bare minimum you can use would be 1/2" plywood over the subfloor, and that's after you've removed the 3/4" oak flooring.

Any idea what the joist system below is comprised of?

I have to say I've not heard of 2x10's being used for subfloor. Are your joists 48" on center, perhaps?
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