Spec for internal vs external insulation not checked

Internal liner and external wrap solve different problems. Verify which insulation type the spec/drawing calls for before installing.

Stop if

• The drawings/spec mention insulation here. Is this supposed to be internal liner, external wrap, double-wall, or another system?

Watch out

• Do not swap internal liner and external wrap because both are 'insulation.'

Check

• Check insulation schedule, duct tag, and notes.
• Confirm whether the duct is lined, wrapped, double-wall, or bare.
• Verify thickness/R-value/acoustic requirement.
• Hold material if what is staged does not match the spec.

Steps

• Check insulation schedule, duct tag, and notes.
• Confirm whether the duct is lined, wrapped, double-wall, or bare.
• Verify thickness/R-value/acoustic requirement.
• Hold material if what is staged does not match the spec.

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