Construction Performance Guidelines
Some squeaking resulting from normal shrinkage of materials after construction is acceptable however; floors shall be reasonably free from squeaks caused by movement in the floor system connections under normal seasonal indoor humidity and loading conditions.
One-Year - Work and Materials · Squeaks resulting from normal shrinkage of materials caused by drying after construction are excluded from the statutory warranty.
Loose connections causing floor squeaks shall be repaired.
Extended low-humidity indoor environments can cause excessive shrinkage in the wood resulting in loose floor connections. Excessive high-humidity indoor environment can cause expansion in the wood resulting in pressure-related floor squeaks. The homeowner must maintain indoor humidity levels to prevent excessive drying or expansion of materials. A permanent squeak-free floor may not be attainable. See Also: 2.3 LOOSE SUBFLOOR Appendix A2 – Moisture in Wood and Laminate Floors