Static field route #19628

What do I do when a duct-to-louver sleeve joint leaks because gasket tape was skipped?

Sealing, Leakage, Mastic & Pressure Testing✅ LEARN / STANDARD FIXField answer expansion

📖 Verified core answer

Metal-to-metal sleeve joints leak. Pull the flange, clean the faces, add the approved gasket/sealant detail, and re-tighten evenly.

Open in Field Rescue Open category

Field verification checklist

Listen for whistle at the sleeve perimeter.
Check if gasket tape or sealant is actually between the faces.
Look for warped flange corners or uneven compression.
Clean oil/dust before resealing.
Retighten evenly and retest before cover.

Ask foreman

The duct-to-louver sleeve at [location] is whistling and appears bolted metal-to-metal. Do you want me to open the joint and add the approved gasket/sealant detail?

Text to foreman

Route options

A Correct it only if the fix is within your assignment and approved method.

B Hold and document if it affects water intrusion, weatherproofing, rated assemblies, structural anchorage, controls, TAB, or another trade.

C Bring the foreman/detailer the location, what you checked, and what decision you need before sealing, testing, cover, or startup.

Do not do this

Do not smear mastic over the outside of a metal-to-metal flange leak if the missing gasket is inside the joint.

Why this matters

A missing gasket can waste air, make noise, and fail leakage/TAB checks.

Final verification

Use this as field training guidance. Final direction still comes from the foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, pressure/material schedule, and AHJ/code requirements.

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