Static field route #344

What do I do when not checking spec for internal vs external insulation?

Insulation, Liner, Vapor Barrier & Condensation.1 field-polished — insulation/rated-detail check

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

Open in Field Rescue Open category

Field checklist

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.

Ask foreman

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

Do not

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

Why it matters

Insulation affects access, vapor barrier, condensation control, inspections, TAB/service access, and finished-work quality. Project specs and manufacturer details still control.

Search words: insulation liner vapor barrier spec