Can I use regular duct sealant on the breakaway joints of a fire damper?

No. You cannot bridge across a fire damper breakaway joint (like an S&D connection) with heavy, thick layers of regular structural duct mastic that could cure hard and structurally lock the joint together. Use only light coats of approved non-setting sealants inside the joint slip track if required by the manufacturer's UL listing documents.

[" No. You cannot bridge across a fire damper breakaway joint (like an S&D connection) with heavy, thick layers of regular structural duct mastic that could cure hard and structurally lock the joint together. Use only light coats of approved non-setting sealants inside the joint slip track if required by the manufacturer's UL listing documents."]

Stop if

• Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.

Steps

• Stop and verify the approved detail, manufacturer instructions, foreman direction, and project specs before touching it.
• No. You cannot bridge across a fire damper breakaway joint (like an S&D connection) with heavy, thick layers of regular structural duct mastic that could cure hard and structurally...

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