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Hard hvac duct installation – GreenBuildingAdvisor
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That definitely doesn’t sound like a proper install. Taps should be sealed directly to the metal trunk, not over insulation like bubble wrap, that compromises both the seal and efficiency. Also, mastic needs to fully cure before covering, or it can trap moisture and eventually fail. Since you paid extra for proper air sealing and insulation, you have every right to expect it done correctly. I’d recommend having a third-party HVAC pro inspect the job and provide a written assessment. If it confirms the issues, use that to request the contractor correct the work, Or consider filing a complaint if they refuse.