I laid ceramic tiles on a suspended wooden floor in my shower/utility room. 6mm Marine ply sheets went down on top of floorboards. perpendicular to the line of the floorboards (which were screwed down to the joists - they had been there for 70 years and were a bit springy)
Its been fine for 8 years, even has a washing machine/tumble dryer bouncing around on top of it, no sign of cracking.
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