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Home inspector checking a bathroom ceiling and HVAC vent with a thermal camera, evaluating signs of past water damage and potential mold.

What We Look For (And What We Don’t): Potential Mold — What We Can Say (and What We Can’t)

If I had a dollar for every time someone asked, “Is this mold?” — I’d have enough to fund my own HVAC lab. Mold is one of the most misunderstood, over-hyped, and under-acknowledged problems in real estate.

So let’s clear the air. Yes, I can point out visible mold. Yes, I can flag areas with moisture or staining. But what I can’t do is tell you if the air you're breathing is safe—unless you bring in a mold specialist to do an air test.

Mold Is More Than What You See

Sure, I can show you black spots on drywall or mildew on a bathroom ceiling. But visible mold is just the tip of the iceberg. The real risk is airborne mold spores. These microscopic particles float through the house—especially through HVAC ducts—and get breathed in constantly. You won’t see them. But you’ll feel them, especially if you’re sensitive or immunocompromised.

Sometimes, I walk into a property that looks clean, but I know the history: a bathroom leak that wasn’t properly remediated. No visible mold now, but without professional cleaning, those spores hang around. You won’t know they’re there until an air test shows elevated mold levels.

What I’m Looking For—And What I’m Not

  • ✅ I’m looking for: water stains, active leaks, past flooding, mold-like growth, and conditions that promote mold (poor ventilation, dark/damp areas).
  • ❌ I’m not performing: mold sampling, air testing, or lab-confirmed mold identification. That’s outside the scope of a general home inspection.

We also use a thermal camera to identify moisture anomalies—often the source of hidden mold growth. If it’s rained in the last 24 hours, we may catch active leaks that haven’t even left visible stains yet. That’s the power of infrared.

So What Should You Do?

If I note suspicious areas or elevated moisture, you should seriously consider a follow-up with a mold remediation specialist. Especially if you:

  • Have allergies, asthma, or breathing issues
  • Plan to live with young kids or elderly adults
  • Smell mustiness or dampness, even when the home looks clean

Cleaning visible mold isn’t enough. Mold spores can stay airborne for weeks. A professional cleanup involves air scrubbers, HEPA vacuums, and containment—not just bleach and paint.

FAQs: Mold and Home Inspections

Can you confirm if something is mold?

No. I can say “mold-like substance” or “visible fungal growth,” but confirmation requires lab testing. We always err on the side of caution.

How can mold be present if I don’t see any?

Airborne spores can remain long after visible mold is removed—especially if the HVAC system or ductwork was contaminated and never cleaned.

Should I get a mold test if the inspector says there was past water damage?

Absolutely. If there's a history of leaks or conditions conducive to mold, an air test can reveal if invisible spores are still circulating.

Can a home inspector recommend mold remediation?

Yes, if we observe likely signs. But we’re not mold contractors—we simply document and refer. The next step is a specialist evaluation and air sampling.

→ Next up: Post 39: Signs of Active Leaks — What Triggers a Concern

← Previously: Post 37: What We Look for When We Suspect Termites or Pests

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