Not screwing the joint where detail or spec requires it
If a joint detail requires fasteners and they are missing, fix that before sealing or covering the joint. Sealant does not replace mechanical fastening.
Ask when screw requirements are unclear, the pressure class is different, or the joint system detail does not match what is in the field.
Watch out
Do not seal over a joint that is missing required mechanical fastening.
Check
Confirm whether this joint detail requires fasteners for the duct type, pressure class, or shop standard.
If the joint is not sealed yet, add the required fasteners before sealing when allowed.
If the joint is already sealed, do not bury the mistake
flag it so it can be corrected cleanly.
Check adjacent joints because the same missed-fastener pattern may repeat down the run.
Steps
Confirm whether this joint detail requires fasteners for the duct type, pressure class, or shop standard.
If the joint is not sealed yet, add the required fasteners before sealing when allowed.
If the joint is already sealed, do not bury the mistake
flag it so it can be corrected cleanly.
Check adjacent joints because the same missed-fastener pattern may repeat down the run.
Say this to your foreman
This S-and-drive joint appears to need fasteners per the detail, but they were not installed. I have [not sealed it yet / already sealed it]. Do you want me to add the required fasteners now before moving on?