Duct Sealing in Texas — When It Actually Works

• Confirmed leakage: testing shows 15%+ total duct leakage or significant leakage to outside.
• Hot attic infiltration: return-side leaks are pulling unconditioned attic air into the system.
• Documented air loss to outside: conditioned air is leaving the building envelope before reaching rooms.
• High energy bills paired with measured leakage: the math actually works.

• Undersized ducts: sealing a restriction makes it worse.
• Pressure imbalance from closed rooms: that's a return air problem.
• Bad duct layout: sealing a poorly designed system seals in the design problem.
• Low actual leakage: if leakage is already under 6–8%, additional sealing won't move the needle.

Every sealing job we do starts with leakage testing and static pressure measurement. We seal the joints that matter — air handler cabinet, plenum seams, boots, trunk connections — and re-test to verify.

Mastic and mesh, not tape. Tape fails in 140°F attics. Properly applied mastic outlasts the duct itself.