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Unread 04-11-2021, 04:27 PM   #9
cx
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Join Date: Jul 2001
Location: Boerne, Texas
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If you can determine what species of wood you have for joists, Kevin, you may find that your structure is suitable for tile as it is. But L/292 is not really "close" to L/360. You can certainly tile over anything you're comfortable with.

Between-joist bridging does not improve the design deflection of the joist structure.

Site cut lumber was commonly at least 4/4 (four-quarter) as I recall as a kid in Pennsylvania where is was pretty common for folks to do some of that. I'm surprised at the T&G edges, though, if it was site cut.

To install tile over the board subfloor you still need to add a minimum of nominal 1/2" exterior glue plywood over the boards.

My opinion; worth price charged.
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