Static field route #19630

What do I do when a cold fresh-air intake sleeve sweats above the ceiling?

Insulation, Liner, Vapor Barrier & Condensation⚠️ CHECK FIRSTField answer expansion

📖 Verified core answer

Cold intake sleeves through humid spaces need insulation/vapor control. Dry the metal, seal air leaks, and wrap the sleeve with the approved vapor-tight insulation detail.

Open in Field Rescue Open category

Field verification checklist

Look for sweating on the exterior sleeve surface.
Check if insulation is missing, loose, or open at seams.
Verify the sleeve carries cold outside air.
Dry the metal before wrapping.
Tape/seal the vapor barrier continuously around corners and supports.

Ask foreman

The outside-air sleeve at [location] is sweating above the ceiling. I checked the wrap and the metal is bare/cold. Do you want it insulated with the project vapor-barrier 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 leave a cold outside-air sleeve bare in a humid plenum and expect paint or caulk to stop condensation.

Why this matters

Condensation can damage ceiling finishes, insulation, and wall cavities.

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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