Air Duct Mold Removal in San Jose, CA

Air duct mold removal in San Jose homes

Older slab tracts around Blossom Valley and Cambrian were built with perimeter ducts cast under the concrete. Winter groundwater finds those runs. That is where most real duct mold in this city lives, not in the attic. The first question is never the ducts. It is where the water comes from.

Material decides the method. Galvanized trunk-and-branch can be scrubbed and stay clean afterward. Fiberglass ductboard plenums and flex liner cannot. The growth sits inside the fiber, not on it. Aggressive brushing just shreds the surface and sheds more. Replacing that section is the honest answer, and we say so.

Plenty of what gets called mold is not. Gray fanning on register faces is usually dust or cooking soot. Filter bypass adds to it. Attic returns here also collect wildfire ash. A camera at the boot settles it.

Homes that run AC heavily often grow biofilm at the evaporator coil instead. Cleaning ducts around a fouled coil accomplishes nothing. The coil gets pulled and washed. The condensate pan and drain line get checked too.

If uninsulated crawlspace metal sweats every winter, cleaning only resets the clock. Insulation or sealing comes first. Otherwise you will see us again.