Identify the exact squeaky spots by walking slowly across the floor
Sprinkle talcum powder or powdered graphite into loose board gaps
Secure loose boards with finish nails or trim screws into the subfloor
Use a stud finder to locate joists before fastening
Drill pilot holes before inserting screws to prevent splitting
Drive screws at an angle through the hardwood into the subfloor
Countersink screw heads below the surface
Fill screw holes with color-matched wood filler
Tighten loose subfloor from below if accessible
Add shims between joists and subfloor where gaps exist
Apply construction adhesive to loose subfloor areas from underneath
Replace damaged or warped boards
Refasten loose nails with ring-shank nails or screws
Use a squeak repair kit for floorboards over joists
Sand and refinish only after structural fixes are complete
Control indoor humidity to reduce wood movement
Avoid over-wetting the floor during cleaning