Duct Sealing in Ventura, CA

Duct sealing in Ventura homes

One room never cools. The hallway vent barely moves air. Dust reappears days after you clean. Those symptoms usually point at the ducts, not the equipment. Leaks pull air from wherever the duct runs. In a crawlspace that means soil, damp and odor. In an attic it means wildfire ash, Santa Ana dust and insulation fiber.

Sealing method depends on what you have. Pre-1960 sheet-metal trunk-and-branch under the floor has loose slip joints and crumbling external wrap. Those get mechanically fastened, mastic over mesh tape, then re-wrapped. Rigid attic runs in 1960s-70s tracts leak at boots and takeoffs. R-4.2 and R-6 flex from the 1980s on often fails at the inner core connection, hidden under the outer jacket. We open it, re-band the core to the collar, seal, then close the jacket.

Platform return plenums in hallway closets are the big one here. Framed drywall or bare wood breathing attic and wall-cavity air. That is unfiltered air going straight past a 1-inch filter slot.

Sealing is not the answer to everything. Rodent-fouled flex gets replaced, not taped. Rusted seams within a mile of the beach may be past saving. Mold on fiberglass liner near the coil is a different job.