Air Duct Repair in San Mateo, CA

Air duct repair in San Mateo homes

One room never gets warm. The rest of the house is fine. That pattern usually means a branch run, not a furnace. Under raised foundations here, flex sags off its hangers. The belly pools and collects debris. Air has to climb through a kinked low spot. Crushed runs behind crawlspace storage do the same thing. We find the restriction first, then repair it.

Rodent damage is the other common one. Peninsula homes near creeks and the baylands see it often. The outer jacket tears and the insulation pulls loose. The inner core often gets punctured too. Patching tape over a torn core is cosmetic. The section gets replaced, re-hung with proper strapping, and sealed at the collar with mastic.

Older houses add a wrinkle. Panned floor-joist and wall-stud return cavities were never sealed. They pull dust straight from the crawlspace and wall voids. Sealing those boots changes what the filter even sees. Uninsulated metal runs in damp crawlspaces sweat, and growth shows up on the exterior and at boot connections.

Asbestos tape on 1920s–40s gravity octopus trunks is not our work. That goes to abatement. We will tell you plainly when a run is past repair and replacement is the honest answer.