We have solid oak 2.25 strip flooring in our upstairs in our early 1970s house (3/4 thick, tongue and groove). We are putting wall to wall carpeting down in the bedrooms because we prefer W2W over HW in bedrooms. But in the master, the floors squeak a lot. The oak flooring is laid over a sub floor of wide pine boards laid at a 45 degree angle to the joists, with gaps between the sub floor boards. Those boards are nailed into joists, and are somewhat brittle (I replaced much of these boards in the bath when that was renovated). The oak flooring is perpendicular to the joists, and also runs under some interior walls that were added later (e.g. closet walls). There is no access from below. I'm trying to figure out what I want to do here. 1. ignore it, and assume the new W2W will help reduce the noise (though not eliminate of course) 2. nail/screw down from above. But there are so many oak boards, and I'd have to make sure I hit the joists, as the sub flooring is pretty poor. 3. remove the HW and put down 3/4 plywood. OR cut out the hardwood AND the sub and do a double layer? But the room is very large (400 square feet -- we combined 2 rooms to make the master, which will also have an office in it), we are living in the room currently, and I'm on a tight budget. Should I do just the portion that squeaks the most (basically between the bed and bathroom) or do #s 1 or 2?