What do I check before an RTU or big equipment gets set on a roof curb?
Do a curb and opening check before the pick: correct curb, correct orientation, gasket path ready, supply/return openings clear, duct attached where required, and access/clearance conflicts called out.
Stop and verify the curb, unit, and duct openings before the connection gets locked in. A curb or opening mismatch is cheap to catch before the set and ugly after the unit is sitting there.
Before we set this unit, can you verify the curb, gasket path, supply/return openings, and service access are correct? I don't want us landing it and then finding out it's rotated or blocked.
Watch out
Do not assume the curb is right just because it is installed, and do not field-adapt the opening without approval.
Check
Match unit tag to curb tag
Check supply/return openings and orientation
Confirm access/service side and connection points
Photograph mismatches before the set
Steps
Confirm the curb matches the unit tag, plan location, orientation, and supply/return layout.
Verify ductwork or curb openings are ready before the unit is set if the project/manufacturer sequence requires it.
Check gasket path, curb top, corners, loose fasteners, bent metal, debris, and anything that could keep the unit from sitting flat.
Look for access conflicts: service panels, coil pull, filter access, disconnect location, roof hatch path, gas/electrical/control routing.
Call out any mismatch before the crane picks the unit.
Say this to your foreman
Before we set this unit, can you verify the curb, gasket path, supply/return openings, and service access are correct? I don't want us landing it and then finding out it's rotated or blocked.