Duct Liner vs External Wrap: Confirm the Intended Insulation System
Confirm whether the duct is designed for internal liner, external insulation, both, or neither before fabrication or installation.
Stop if
- Is this run supposed to be internally lined, externally wrapped, or both, and where does the change occur?
Watch out
- Do not swap liner for wrap because one is easier, double-insulate without approval, or cover labels and service access.
Check
- Read the duct schedule and insulation specification
- Check acoustic, thermal, and condensation requirements
- Confirm exposed or concealed condition
- Verify liner thickness, wrap thickness, and facing
- Coordinate access doors, dampers, sensors, and supports
Steps
- Read the duct schedule and insulation specification
- Check acoustic, thermal, and condensation requirements
- Confirm exposed or concealed condition
- Verify liner thickness, wrap thickness, and facing
- Coordinate access doors, dampers, sensors, and supports
Say this to your foreman
Is this run supposed to be internally lined, externally wrapped, or both, and where does the change occur?
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