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hard ceiling direct hung off steel joist bottom chords

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Any thoughts:


Has anyone ever designed joist bottom chords for loads hung on them from a direct hung ceiling: ie. Furring and gypsum board?  Suspended ceilings have clear cut requirements.  Is the direct hung ceiling a finish that does not need to meet architectural component requirements for a defined load path to the structure?  If you have a ceiling hung directly off the bottom of the joists – it could load the joist bottom chords with out of plane seismic forces.




Scott M Haan