Do not trust one short zip screw as the structural support for a duct run.
Check
Check every strap in that run for fastener count and bite.
Look for torn holes, stripped screws, or duct wall distortion.
Support the duct before removing bad straps.
Use approved fastener/backing detail.
Recheck elevation after correction.
Steps
Check every strap in that run for fastener count and bite.
Look for torn holes, stripped screws, or duct wall distortion.
Support the duct before removing bad straps.
Use approved fastener/backing detail.
Recheck elevation after correction.
Say this to your foreman
This hanger strap at [location] is held by one small screw into duct skin. I stopped loading it. Do you want the straps refastened per approved support detail across this run?