I would like to level a plywood subfloor that is out of level by as much as 1.5" over a 6 ft. span. I've looked at various approaches and think that the easiest may be to install 2x4 sleepers on top of the existing 3/4" plywood subfloor. The sleepers would be ripped the 4 inch way and spaced 16" on center. Then I plan to install 1/2" plywood on top of the sleepers and hardwood on top of the plywood.
Anyone have experience ripping 2x4's along the 4 inch dimension? What's the easiest way to do that? Is there a special kind of saw to do this?
Any comments on this approach? Would you change it in any way? See any potential problems? The total area I have to level is 750-800 sf. Thanks