Cladosporium: The Common Mold That Hides in Plain Sight

When you think of mold, you might picture black or green patches on a wall. But one of the most widespread and sneaky types of indoor mold is Cladosporium. It’s extremely common, often overlooked, and can show up in surprising places inside your home. While not always dangerous, Cladosporium can still impact both your health and your property.

Here’s what you need to know.

What Is Cladosporium?

Cladosporium is a type of mold found both indoors and outdoors. Unlike some molds that only thrive in very wet conditions, Cladosporium can grow in a wider range of environments — even in cooler areas of your home. It typically appears as dark green, brown, or black spots.

Behavior of the Mold

Cladosporium spreads quickly when conditions are right, especially in areas with humidity, condensation, or water damage. It can survive on many household materials and continue to release spores into the air, which can then be inhaled or carried to other parts of your home.

Structural Materials It Feeds On

This mold is a bit of a generalist — it doesn’t need much to thrive. Common places where Cladosporium is found include:

• Carpets and upholstery

• Wood and subflooring

• Painted surfaces and wallpaper

• HVAC systems and ductwork

• Bathroom tiles and shower curtains

  
  

Allergic Potential & Health Concerns

Cladosporium isn’t typically considered toxic, but it is highly allergenic. Common symptoms of exposure include:

• Sneezing, nasal congestion, and itchy throat

• Asthma flare-ups or difficulty breathing

• Eye irritation and watery eyes

• Skin rashes for sensitive individuals

For those with asthma, allergies, or weakened immune systems, exposure to Cladosporium can be especially uncomfortable and persistent.

Mode of Dissemination (How It Spreads)

Cladosporium reproduces through airborne spores, which can easily become airborne when disturbed. Once released, spores can move through your ventilation system or settle on damp surfaces, starting new colonies elsewhere in your home.

Why Testing Matters

Because Cladosporium looks similar to other molds, it’s easy to misidentify it. Professional testing not only confirms if Cladosporium is present, but also helps determine how widespread the contamination is — giving you the right plan for cleanup and prevention.

Call Lighthouse Environmental for Help

If you suspect mold growth in your home, don’t wait until it spreads further. At Lighthouse Environmental, our licensed assessors provide thorough inspections, mold testing, and detailed reports to give you clear answers and peace of mind.

Your health and your home matter — let us help protect both.

📞 Call us today at 845-228-0076 to schedule your mold testing appointment.