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Having just removed the subfloor and intalled new joists sistered to the old, I had a fairly serious 'leveling' problem. Since this house house is about 140 yrs old, there's been a lot of 'settling' and sagging that couldn't be handled even with new joists. The one area (14' x 9') was 'dished' from o.oo" at the perimeter to about 2 1/8" at the center. I set up a laser level at about a 4' height and measered the height every 12" on each new joist and transferred the dimensions to a 'map' of the area. I subtracted all the dimensions fom the largest and the results were the 'spacers' needed for a level floor. After cutting them to size on the table saw, I glued them all in place and checked for level. Everything squared up, so I layed two layers of 3/4 plywood down. Checking for level each step of the way. It's rock solid now with no indications (so far)of change. Floorman, do you feel the plywood will still sag even though the spacers are (at the most) 12"? I felt comfy with that, since it's better than the joist 16" centers. The 2nd layer of ply was layed perpendicular to the first. THe first was generously screwed to the floor joists, the 2nd layer is about 50%as 'generous'.
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