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If you have that much down now, I'd just put down 1/4" cement backer board or the easier to use Hardibacker (~$10 for 3x5). Hardi has a website, HardiFlooring.com. You definitely need the 3/4" plywood as particle board wouldn't support it well. I've laid lots of tile using 1/4" or 1/2" backer board over 3/4" plywood and it still looks great. This includes the .88 stuff from HD and the high-end $7 sq ft stuff. Just make sure you use mortar on both sides and screw the backer board down (don't use roofing nails).Tom
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