Static field route #335

What do I do when not sealing insulation seams/joints?

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

Seal insulation seams so the vapor barrier is continuous. Open seams let moisture, dirt, and air movement get into the insulation.

Open in Field Rescue Open category

Field checklist

Check lap direction and seam overlap.
Use the approved tape/mastic/jacket closure for the insulation system.
Seal corners, fittings, and underside seams — not just the easy face.
Recheck after the duct is bumped or moved.

Ask foreman

Do you want this insulation seam sealed with the project-approved tape or another closure method?

Do not

Do not leave seams open because they face the deck or wall.

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 insulation seal