Content Gap Batch 11

Vapor-Barrier Seams: Close Every Cut, Tear, and Penetration

Insulation, Liner, Vapor Barrier & CondensationVERIFYField judgment

Core Answer

Maintain one continuous vapor barrier by sealing seams, overlaps, hanger penetrations, access doors, and repairs with the approved compatible system.

Is this the approved vapor-barrier repair system for these seams, hanger penetrations, and tears?

Do not use general-purpose tape, leave fish-mouths open, or bury a wet or damaged insulation repair.

Small vapor-barrier breaks can become condensation points that wet insulation and stain ceilings.

Verify against: insulation manufacturer instructions, project insulation specification, approved jacket system.