Noises in Floor System

[rheim]

At one of the residential homes I designed, TJI floor joists were installed with top flange hangers welded to a steel beam (no nailer used). All components are in accordance with the manufacturers recommendations, but we still have nasty noises, like metal on metal (it is not because of shiners).
Any ideas about what causes this and how to fix it would be greatly appreciated.

 

[hokie66]

And thanks for reporting back. A lesson learned. Noises in buildings, especially buildings where people sleep, are a nuisance, and often have obscure causes which seem obvious once solved.