Content Gap Batch 11

Large Duct Gap: Repair the Joint Before Adding Mesh and Sealant

Sealing, Leakage Testing & Airside VerificationVERIFYField judgment

Core Answer

Correct the mechanical fit first; use reinforcing mesh and sealant only within the approved product limits and project detail.

This joint has a gap of about [measurement]. Do you want the metal refit first, and is reinforced mesh approved for the remaining gap?

Do not bridge a badly fitted or unsupported joint with a thick pile of mastic and call it repaired.

Sealant cannot reliably replace missing mechanical fit, support, or joint engagement.

Verify against: sealant manufacturer gap limits, project sealing detail, foreman direction.