New answers tagged underlayment
Assuming the existing subfloor does not have excessive deflection in it, I would put down a 1/4" tile backerboard instead of plywood, and then put Ditra on top of that, and then tile. If you are using a 1/4" floor tile, that will give you pretty much a 3/4" final thickness which generally works well with other flooring. If the subfloor isn't that solid, ...
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