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Try and get the floor as level or flush, I should say, with the finish floor on the outside and deduct 3/8" to 1/2" for the stone. Depending on how much build up is needed to achieve this, Hardibacker board can be used right on top of the plywood. If there is no rot, then screw down the plywood to the floor joist for some additional strength. Does the floor bounce? If the sub floor(plywood) isn't coming out, do you have access to get under there for some additional blocking between the joist? That will stiffen the floor a bit to eliminate bounce. Glue the Hardibacker to the plywood and tile on top of that. Another method is builder paper the whole floor and screw down Hardibacker to the subfloor and make sure you get a few screws (long suckers and not drywall screw) on the joist for a better installation. if the floor is nice and level without dips, then you are ready to set the stone. Fill the dips with self leveling compound if there are any.
Setting stone is just like setting regular tile. Make sure you use the correct thinset. In general, Mapei is what we use with great result. GEt us a photo will ya.
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