Static field route #18810

What do I do when a duct seam pops open during a pressure/leak test?

Sealing, Leakage, Mastic & Pressure Testing📐 PERFORMANCE / COORDINATION CHECKV188 answer-gap expansion

📖 Verified core answer

Depressurize, mark the failed seam, and identify whether the duct/seam type matches the system pressure class and approved materials. Do not smear sealant over a popped structural seam and call it fixed.

Open in Field Rescue Open category

Field verification checklist

Stop/depressurize the test setup before handling the failed section.
Mark the exact seam, joint, fitting, or connector that failed.
Check duct type, gauge, seam style, connector type, pressure class, and whether the section was approved for that system.
Inspect for unsupported duct, damaged pipe, bad connector alignment, missing reinforcement, or overpressurized test condition.
Repair/replace per approved detail and retest only after the structural issue is corrected.

Ask foreman

The seam at [location] opened during the pressure/leak test. I depressurized, marked it, and checked the duct/seam type. Do you want this section replaced, reinforced, or sent back to the shop/detailer before retest?

Text to foreman

Route options

AMake the small 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 hide a popped seam with mastic, tape, or extra screws if the seam itself is not structurally right for the system.

Why this matters

A popped seam can fail the test again, leak after startup, damage insulation, and expose a wrong-material or wrong-fabrication issue.

Verification basis

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