If you are getting callbacks for uneven or squeaky floors, make sure that you are correctly spacing your OSB subflooring panels. Wood expands or contracts with changes in moisture conditions and without proper spacing, the panels can push together and this causes the edges to lift which, in turn, causes the squeaks and bumps.
Plywood and OSB paneling expands and contracts as it adjusts to the moisture content of the building site. Unrestrained by fastening and framing, panels can move an average of 1/8 inch as they acclimatize. Correct spacing of panels will help to make allowances for expansion and prevent buckling of walls, floors and roofs and gaps in the building envelope that will compromise energy efficiency. “Energy savings start with the framing.”