Air Duct Mold Removal in San Juan Capistrano, CA

Air duct mold removal in San Juan Capistrano homes

Marine layer mornings sit over this valley for weeks. Supply air runs cold through attic flex. Bathroom and north-facing boots sweat at the collar. That moisture lands on dust already in the duct. Mold grows where those two meet. That is why the boot, not the middle of the run, is usually the real problem.

Removal starts with finding the water. Sanitizing a wet boot accomplishes nothing. We look for crushed radius elbows and sagging flex pooling at low points between truss bays. Unsealed platform returns also pull in attic air. Pre-2000 runs carry R-6 insulation. Thin jackets condense sooner. Older homes may still have fiberglass duct board plenums whose binder has aged and started shedding.

Source removal comes next. Negative air goes on the run first. Agitation and contained extraction follow. Supplies and returns both get treated. Coil and plenum get cleaned, because the coil is where bypassed dust collects. Boots and collars get resealed with mastic, not tape. Tape fails here, every time.

Sanitizer is used only where growth is documented. Fogging a clean system is theater.

Builder-grade filter grilles are often undersized for system CFM. Air slips past the filter edge. Correct that sizing or the duct reloads with attic dust within a season.