Cool. I'll check that out.

Thanks. I appreciate it. You guys are awesome.

My response would be this, since everyone is suggesting 2 layers of proper plywood than 1/2 on top of that, why don't you just hardpack the entire floor area with 1 1/4" mortar over the top of the 5/8" plywood same thickness. Than it does't matter what the finished flooring is ?

If height is not a problem and the floor joists are 2x10 why can't you drop the 5/8" to 3/4" plywood subfloor and install an 1" 1/4" hard pack over than the tile or stone ?. That is what we used to do in the older days.