I'm contemplating both worthwhile solutions from this less specific question. However, I'm concerned about my ability to nail down hardwood flooring after using a leveling compound, and am reluctant to expend the effort to rip out and replace the subfloor per the second answer.
In my specific case, I need to level the floor in an upstairs room where one of the floor joists is, I'm assuming, 3/4" higher than the rest of them. Along one side of the room, the subfloor is 3/4" higher. It drops to the height of the rest of the room over about the first twelve inches of each subfloor board.
I am contemplating purchasing 3/4" thick plywood boards and attach them to the existing subfloor except for the elevated area. Then, along the twelve inch strip, I would use leveling compound. I could then stagger the hardwood flooring to avoid nailing into the leveling compound.
Is this a reasonable approach?