Static field route #18928

What do I do when an RTU curb gasket is torn, skipped, or leaking at a corner?

Equipment Connections: RTU, AHU, VAV, Fans & Louvers🟥 STOP / VERIFYV189 answer-gap expansion

📖 Verified core answer

A curb gasket failure can become a roof leak into the supply/return opening. Do not hide it with outside caulk only; document it and get the unit reseated/re-gasketed by the approved method.

Open in Field Rescue Open category

Field verification checklist

Inspect all curb corners before the crane unhooks when possible.
Check for torn, stretched, dirty, missing, or folded gasket.
Look for curb damage, plenum opening exposure, roof membrane issues, and unit alignment.
Document the condition with photos before weather hits or the unit is fully tied in.
Coordinate safe lifting/jacking and roofer/equipment requirements before repair.

Ask foreman

The RTU curb gasket at [corner/location] is torn/missing/folded. I checked the curb and unit alignment. Do you want us to lift/reseat and replace gasket per the approved detail before we tie this in?

Text to foreman

Route options

AMake the field correction only if it is within your assignment and the approved method.

BHold and document the condition if the fix affects airflow, access, life safety, pressure class, rated assemblies, equipment, or another trade.

CBring the foreman/detailer the location, what you checked, and what decision you need before cover, startup, or rework.

Do not do this

Do not rely on exterior caulk to fix a failed curb gasket that is trapped under the RTU.

Why this matters

A bad curb gasket can leak rain into the building, create air leakage, damage insulation/ceilings, and be expensive to repair after startup.

Verification basis

Approved drawings/specs, project coordination drawings, manufacturer instructions/submittals, shop standards, foreman/detailer direction, employer policy, and AHJ/code requirements.