Correct. Most squeaky wood floors and stairways, etc., were just assembled poorly and you can actually fix them in situ with finish screws. I recommend the #8

Correct. Most squeaky wood floors and stairways, etc., were just assembled poorly and you can actually fix them in situ with finish screws. I recommend the #8 GRK finish screws @ 2.5 inch length. Either find your biggest (heaviest) friend to stand on the spot before you insert the screw OR find a way to jam the floor down from the ceiling. You lock the floorboard in place, fully compressed, and then seal it in place with the screw(s). For new wooden floors, I highly recommend a layer of cork between the floorboards and subfloor for a variety of reasons ... insulation, noise, squeak avoidance, etc. I would not build a wooden floor without that layer.