Static field route #328

What do I do when wrong insulation thickness not accounted for in clearance?

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

Account for insulation thickness before deciding a duct clears. Bare duct clearance is not finished clearance.

Field checklist

Measure the duct plus required insulation thickness.
Check clearance to ceiling grid, walls, lights, access panels, and other trades.
Confirm whether insulation will be external wrap, internal liner, or another system.
Flag any area where insulation will make access impossible.

Ask foreman

With the insulation thickness added, this clearance gets tight at [location]. Do you want this rerouted or verified before wrap?

Do not

Do not approve a tight route based on bare-metal duct only.

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.

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