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Just went through this with our bathroom. Although I sistered up the floor joists, it was not possible to square it away for various other reasons. What I did was to set up a laser level and measured five locations from the light to each joist. (each joist being about 7 1/2 feet long.) I sketched out a 'chart' of the bath and noted the dimensions at each 'location'. I also inserted a dimension that would be the mean between each, giving a total of 9 points on each joist. The 91 dimensions ranged from 1/8" to 1 7/16". I cut the 91 spacers to match and laid them out according to the chart. The spacers were then glued to the joists. The next day I laid down the 3/4 ply and did a check...maybe a 1/32 in two feet! So I screwed it down and continued on. The end spacing between the spacers wsa less than 9 inches. I felt comfy with that, since the joists spacing is 16". A second layer of 3/4 made what was already a solid floor like a rock.
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