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

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

Sealing, Leakage, Mastic & Pressure Testing 1st Year YELLOW

Watch out

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

Check

room/grid/area
photo of the condition
current drawing/detail/submittal
measurements or test information
what has already been checked

Say this to your foreman

large duct gap: repair the joint before adding mesh and sealant sealing, leakage testing & airside verification large duct gap mesh mastic joint gap sealant repair correct the mechanical fit first; use reinforcing mesh and sealant only within the approved product limits and project detail. sealant cannot reliably replace missing mechanical fit, support, or joint engagement. sealant manufacturer gap limits, project sealing detail, foreman direction this joint has a gap of about [measurement]. do you want the metal refit first, and is reinforced mesh approved for the remaining gap?

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