HVAC Systems · Ductwork Materials
Duct Mastic
A thick, water-based sealant brushed onto duct joints, often with mesh tape, to seal air leaks far more durably than standard duct tape and recover lost conditioned air.
Common uses
Sealing supply and return duct joints to reduce duct leakage
Common symptoms
- High energy bills
- Uneven room temperatures
- Weak airflow at registers
Common repairs
- Sealing accessible joints
- Reinforcing seams with mesh tape
Related terms
Related guides
Pro launch updates
Get notified when Pro launches, plus a monthly code-change digest. Email only — no account required.