Mold in homes

What inspectors look for

• Visible growth on walls, ceilings, under sinks and in attics.
• Water stains and elevated moisture readings.
• Musty odors, especially in closets and crawlspaces.
• Bathroom fans that don’t vent outside.
• Condensation on windows and cold surfaces.
• Grading and drainage that keep walls wet.

The report will usually call it “suspected microbial growth,” because only lab analysis confirms what it is.

When to test

Sampling is worth paying for when:

• You smell mold but can’t see it.
• Someone in the household has health concerns.
• You need clearance testing after remediation.
• A dispute requires documentation.

Hire an independent consultant, not the company that will do the removal.

Cleaning versus remediation

The U.S. EPA suggests that small areas, less than about 10 square feet, can often be cleaned by the homeowner with detergent and water, while wearing gloves, goggles and an N-95 respirator. Larger areas, growth inside walls or HVAC systems, and growth after sewage or flood water call for a professional who contains the area and removes damaged material.

Common Southern California sources

1. Shower pans and tile that leak into the wall.
2. Slab leaks under flooring.
3. Roof leaks around flashing and vents.
4. Planters and sprinklers against stucco walls.
5. Air conditioner condensate lines that overflow in attics.
6. Coastal homes with little ventilation.