3/4 ply with subfloor adhesive
Ahh the pocket door.
I cut a full sheet of 3/4 ply (1/2" MINIMUM) to cover up the entire pocket area . Apply good goober of subfloor adhesive on each of the 1x slats and screw it together with 1 5/8" screws. (Pre-drill as these slats are NOTORIOUS for splitting) Cut the plywood tight to the floor and top plate, so that you can toe some screws in top & bottom for extra rigidity. It's surely viagra for the standard pocket wall. Then put on the 1/2" backer you were going to use anyway (I would use a glue for this too).
The tiling should be more than ok, a pro will chime in shortly.
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 Mike - would rather be fishing. And that's not a whip, thats my lively nightcrawler!
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