Static field route #19360

What do I do when spiral duct drips condensation through seams in a cold attic?

Insulation, Liner, Vapor Barrier & Condensation⚠️ CHECK BEFORE YOU FIXField answer expansion

📖 Verified core answer

Moist exhaust in cold space needs condensation control. Seal the system and insulate/wrap it by the approved vapor-barrier detail.

Open in Field Rescue Open category

Field verification checklist

Identify humid source: shower, locker, kitchen, laundry, or exhaust.
Check cold-space exposure and missing insulation.
Look for pitch/backfall and low points.
Seal seams with approved moisture-resistant method.
Wrap with approved vapor barrier/insulation where required.

Ask foreman

The spiral exhaust at [location] is dripping through seams in a cold space. I checked moisture source and insulation. Do you want seams sealed and the run wrapped per vapor-barrier detail?

Text to foreman

Route options

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

BHold and document if it affects pressure class, listed assembly, material spec, support load path, fire barrier, equipment, TAB, or another trade.

CBring 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 treat condensation leaks as just a few pinholes if the duct is sweating along the run.

Why this matters

Condensation can damage ceilings, cause mold complaints, and corrode duct from the inside out.

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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