How Can I Seal a Leaking Air Duct to Improve HVAC Efficiency?
You can seal small air duct leaks with HVAC mastic or UL 181 foil tape to improve airflow and efficiency. Avoid cloth “duct tape,” which fails under heat. For bigger gaps, disconnected joints, or hard‑to‑reach attic/basement runs, schedule professional air duct sealing. Wisler offers duct sealing and indoor air quality solutions across Rocky Mount and Roanoke.
Quick steps:
- Clean the duct surface; dry fully.
- Press UL 181 foil tape over seams or pinholes.
- Brush mastic over joints/boots; let cure per label.
- Recheck for leaks while the system runs.
Updated: 2026-01-02 00:00:00
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Sources
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