TinnerFlow™2nd YearDampersRED · Stop / Verify
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.
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.