When most people think of indoor mold, black mold (Stachybotrys) usually comes to mind. But there’s another aggressive mold species that’s often overlooked and just as dangerous: Chaetomium.
This lesser-known mold is frequently found in water-damaged homes and buildings, yet few people—even some professionals—know how to identify it or understand the risks. At MSI, we’ve encountered it time and time again during inspections, often in places the average homeowner wouldn’t think to check.
What is Chaetomium?
Chaetomium is a genus of mold that typically appears as cottony, white, or gray at first, and then darkens to olive, brown, or black as it matures. It’s often found on cellulose-rich materials such as drywall, wallpaper, insulation, and baseboards—especially after water damage has occurred.
It’s particularly common in:
- Leaky basements and crawlspaces
- Water-damaged walls and ceilings
- Under carpets or floorboards after a flood
- HVAC systems with trapped moisture
One of the key indicators of Chaetomium is a musty or earthy odor, sometimes stronger than what other molds produce.
How Does Chaetomium Enter a Home?
Like many molds, Chaetomium spores are airborne. Once moisture is introduced—whether through a leak, flood, or high humidity—it can begin to grow on organic building materials. It spreads quickly in damp conditions and thrives in environments that remain wet for extended periods.
Failure to properly dry and remediate a space after water damage often leads to Chaetomium growth alongside other mold species.
Health Risks Associated with Chaetomium
This mold isn’t just an eyesore—it’s a health hazard. Studies have linked Chaetomium exposure to a variety of health issues, particularly in individuals with existing respiratory problems, allergies, or weakened immune systems. Some of the most common symptoms include:
- Chronic sinus congestion or irritation
- Skin and nail infections
- Headaches and fatigue
- Persistent coughing or wheezing
- Aggravated asthma symptoms
- Neurological symptoms in extreme, prolonged exposures
It’s also been found in some cases to produce mycotoxins—harmful substances that can cause cellular damage or immune suppression in sensitive individuals.
Why DIY Mold Cleanup Isn’t Enough
Chaetomium often grows behind walls or underneath surfaces, which means visible mold is just the tip of the iceberg. DIY bleach sprays or quick cleanups won’t solve the problem and may spread spores to new areas of your home.
Professional testing and remediation are critical to identify the full scope of the problem and remove it safely and thoroughly.
Trust the Experts at MSI
MSI has been identifying and remediating dangerous molds like Chaetomium since 1998. With over 10,000 successful mold tests performed and a reputation as a trusted expert witness in mold litigation cases, we know what to look for—and how to get rid of it for good.
If you’ve experienced water damage or notice a musty odor in your home, don’t wait. Contact MSI today for a professional mold inspection and take the first step toward a safer, healthier home.