If your wood floor lies over a wooden sub-floor, securing the two layers with small fasteners may cut down on the squeaking. ("If you have access underneath," notes Borgenicht, "then you may screw from the sub-floor to the wood floor using smaller screws.")
Sometimes a loose subfloor is the culprit. The best way to fix it is from beneath, says Borgenicht, either by driving screws through the floor joist into the subfloor to eliminate gaps, or putting a "shim" between the floor joist and the sub-floor.
If you lack access from below, he says, you can drive a nail (size 6d or 8d) through the finish floor, sub-floor and joist.
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