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Old 06-18-2017, 12:45 PM   #7
lawriesv
 
Join Date: Aug 2007
Posts: 30
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Wood floor assemblies (including finished flooring, subflooring, and joists under them) tend to dry out with time more than when they were first installed, and shrink (in the cross-grain directions) when drier. This allows movement between the components. Higher dynamic forces (e.g., due to more weight, moving) would cause additional movement of some of the now-looser components (i.e., creaking).

Some better renovations add additional screws to tighten the joints between the components, reducing the creaking.
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