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I read the same thing about backer board and 3/8" plywood... But what about the diagonal planking over joists (as in photo)? It is 1 in. thick and got to be good for something, because it is solid wood and in a good shape. It got be stronger than CDX etc.

If the joists are strong enough according to deflection calculation, what is missing then? Something that gives strength in between joists?

I don't have links for that. My question is Would 1"x6" planking, 3/8" plywood and 1/4" backer board over joists be acceptable subfloor for tiling?

Thanks. I also had a specific question about floor prep... Can I add the thickness of the diagonal planking to the 3/8" plywood and 1/4" backer board to get the desired 1-1/2" support for the tiles?

Yes, thanks, I know that much. The question is if the joists and the rest of the floor underneath the kitchen is strong enough for an extra layer of tile...

Hello, I have a question about floor prep for regular travertine tiles. I had a linoleum covered kitchen floor flush with the adjacent hardwood floors in a 60 year old house. I removed the linoleum and most but not all linoleum glue with felt. Underneath the linoleum is what looks like 3/8...