I need to put down a hardwood floor in a bedroom and I'm not entirely certain that the subfloor is adequate. The subfloor is 1X12 boards (3/4"X 11.5") nailed to 16" O.C. joists. There are gaps between the boards up to nearly 1/2" but genrally 3/8" or less. The hardwood I'm nailing down is 3/4" American Cherry with boards ranging in length from 11" to 48".
I've already taken down a significant hump in the floor by removing four of the 1X12's and planing down the joists. All the 1X12's had a center crown which I have planed and sanded down to a flatter state. I still have many spots where there is an elevation difference between abutting floor boards and there are still some humps. I have also put a lot of screws into these boards to tighten things up.
I've been working on this floor for days now and no way will I be able to get it perfectly even or flat, but assuming I get it to a tolerable state, is it still even avisable to nail hardwood to such a subfloor?
It's an upstairs bedroom and I'm working by myself and I don't have a truck, so lumping in sheets of plywood would take some doing.
Thanks very much for any advice. Apologies if this is a bit long, but I wanted to be specific.