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Well, if you really want to get technical. It is 1 1/8" unlike the older days, 1 1/4". There are plenty of 1" plywood and its available in specialty plywood houses, if not special layup or order maybe necessary
I just dislike stacking up too many layers of floors. Once I am that far, how much more is it to remove a few pieces of 1x 6 sub floor (We discovered that more then few pieces are usually split from nails or rot). Its a half day's work, one day including some additional framing such as blocking and replacing hacked up framing from plumbers who like to remove parts of joist for the toilet flange. That's the reason I do it that way. My clients are more then happy to pay it since its normally under 1000 bucks for a small bath when its all said and done. Again, I dislike installing cast iron tubs, especially the deep and larger one over 1x6 sub floor. We try our best to do nice work so if it cost more and delay the job a couple days, most people are happy to do it.
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