Exterior and UV-Rated Duct Sealant Verification

Outdoor duct needs an approved weather- and UV-resistant sealing system compatible with the metal, coating, insulation jacket, and expected movement.

Stop if

• This joint is exposed outdoors on [material/coating]. Which approved exterior sealant system and surface prep does the spec call for?

Watch out

• Do not assume an interior duct mastic, generic caulk, or foil tape will survive sun, water, temperature cycling, and movement.

Check

• Identify the substrate and existing coating
• Confirm the product is approved for exterior exposure and temperature range
• Check surface preparation and cure conditions
• Use compatible reinforcing fabric or tape only when required
• Coordinate final weatherproofing with insulation and roofing scopes

Steps

• Identify the substrate and existing coating
• Confirm the product is approved for exterior exposure and temperature range
• Check surface preparation and cure conditions
• Use compatible reinforcing fabric or tape only when required
• Coordinate final weatherproofing with insulation and roofing scopes

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