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Unread 10-19-2019, 06:42 PM   #6
cx
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Join Date: Jul 2001
Location: Boerne, Texas
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The "dipping between the joists" would be a characteristic of the thin plywood you have along with it being old and no longer in perfect condition. I'd very strongly suggest you add a second layer of nominal 1/2" exterior glue plywood before installing your tiling substrate and tile.

In the alternative, I'd suggest you at least remove the subflooring you have and replace it with a first layer of nominal 3/4" T&G, exterior glue plywood, which would be somewhat better as a single layer subfloor for your tile.

But that's all up to you.

My opinion; worth price charged.
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