Chaetomium Mold: The Hidden Danger After Water Damage

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Most homeowners know to worry about mold after a flood or leak—but they may not realize that some of the most destructive types of mold grow behind the scenes, inside walls or under carpets. One of the most commonly overlooked yet serious molds in water-damaged properties is Chaetomium (pronounced key-TOE-mee-um).

If your home or business has suffered a roof leak, plumbing failure, or flooding, you need to know about this mold—and why it’s a red flag for more than just allergies.

What Is Chaetomium Mold?

Chaetomium is a cellulose-loving mold commonly found in buildings that have suffered water damage. It thrives on materials like drywall, wallpaper, carpets, wood, and insulation—basically anything organic that stays damp for too long.

Unlike many molds that grow in visible patches, Chaetomium often hides inside walls or under floors, growing undetected until serious damage occurs.

Where Does Chaetomium Grow?

Chaetomium needs high moisture and cellulose to grow. It’s commonly found in:

  • Drywall after roof or pipe leaks
  • Carpet padding and subflooring
  • Basement walls and foundation leaks
  • Behind wallpaper or paneling
  • Attics and crawlspaces with poor ventilation

Its presence often indicates prolonged moisture exposure—and sometimes deeper structural issues.

Health Risks Associated with Chaetomium

While Chaetomium isn’t as notorious as Stachybotrys (black mold), it can still cause a range of health issues, especially in people with:

  • Asthma or respiratory sensitivity
  • Weakened immune systems
  • Allergies or chronic sinus infections

Exposure to Chaetomium spores may lead to:

  • Persistent coughing or sneezing
  • Skin and eye irritation
  • Headaches or fatigue
  • Neurological symptoms in severe or long-term cases

In rare situations, certain species of Chaetomium have been associated with opportunistic infections in immunocompromised individuals.

Why Chaetomium Indicates Bigger Problems

One of the biggest concerns with Chaetomium is that its presence often means there’s been significant, ongoing water damage. By the time it’s detected, building materials may already be compromised.

It’s also commonly found alongside other toxic molds like Stachybotrys and Aspergillus, which makes accurate identification and complete remediation critical.

How to Detect and Remove Chaetomium Mold

Chaetomium is difficult to identify without laboratory testing. That’s why professional mold inspection is the safest first step after water damage.

At MSI, we conduct:

  • Air and surface mold testing to identify the type and severity of mold
  • Moisture mapping to find the source of dampness
  • Containment and HEPA air filtration to prevent cross-contamination
  • Safe removal of affected materials followed by antimicrobial treatment

Because of its hidden nature and aggressive growth, Chaetomium cleanup should never be DIY.

Water Damage? Don’t Wait for Chaetomium to Appear

If your property has experienced flooding, leaks, or high humidity, don’t assume the problem is gone just because surfaces look dry. Hidden mold can begin growing within 24–48 hours of water exposure.

The sooner it’s identified, the easier and safer the cleanup process will be.

Schedule a Mold Inspection with MSI Today

At MSI, we’ve been inspecting and remediating mold since 1998. Our certified team has seen thousands of water-damaged buildings and knows exactly what to look for—even the mold you can’t see.

Call us at 877-712-1600 to schedule a professional mold inspection and protect your home, health, and investment.

Cladosporium: What Homeowners Need to Know About This Indoor Invader

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What Is Cladosporium? Pronounced: clad-oh-SPORE-ee-um Cladosporium is a dark green to black mold made up of clusters of spores that thrive in both warm and cool environments. Unlike many molds that prefer warmth, Cladosporium can grow in refrigerators, on cold basement walls, and inside HVAC systems.

It often looks like soot, dirt, or dust and may be mistaken for simple grime—especially on window sills, vents, and painted walls. But don’t let the subtle appearance fool you.

Where Cladosporium Is Commonly Found

You’ll typically see this mold in:

  • Window sills and wood trim around windows
  • HVAC vents and ductwork
  • Closets, especially those with poor airflow
  • Fabric furniture and carpets
  • Bathrooms, especially behind toilets or under sinks
  • Basement walls, especially concrete or drywall exposed to moisture

Cladosporium grows quickly in areas with condensation, high humidity, or poor ventilation—making it a common sight in homes with water issues or older, leaky windows.

Is Cladosporium Dangerous?

While Cladosporium isn’t classified as a toxic mold, it can still be harmful—especially for people with allergies, asthma, or weakened immune systems. Common symptoms include:

  • Nasal congestion or sneezing
  • Coughing or wheezing
  • Itchy, watery eyes
  • Skin irritation or rashes
  • Exacerbation of asthma or respiratory issues

Long-term exposure can worsen these symptoms, particularly in homes where Cladosporium is present in ventilation systems, allowing spores to circulate throughout the air.

Why DIY Cleaning Often Fails

Many homeowners try to wipe away what looks like dirt—only for the mold to return within days or weeks. That’s because:

  • Surface cleaning doesn’t kill the root of the mold, especially if it has penetrated drywall or wood.
  • Porous materials like insulation, carpeting, and wallpaper can trap spores beneath the surface.
  • HVAC systems can recirculate spores, spreading the problem throughout your home.

Without professional remediation and moisture control, Cladosporium keeps coming back.

How MSI Can Help

At MSI, we’ve performed thousands of mold inspections and remediations projects since 1998. Our process includes:

  • Detailed mold testing to confirm the species and spore count
  • Source tracking to find moisture or ventilation problems
  • Safe removal using HEPA filtration and containment
  • Post-remediation testing to ensure the issue is fully resolved

We don’t just clean—we eliminate the conditions that allow mold to thrive.

Don’t Let Cladosporium Linger in Your Home

What looks like a little dirt or dust might be something far more serious. Cladosporium mold is one of the most overlooked causes of poor indoor air quality, especially in homes with older windows, musty basements, or recurring moisture. If you’ve noticed dark spots on vents, sills, or walls, it’s time to get it checked. MSI has the tools, experience, and knowledge to identify the mold and remove it safely. Call today and let us help you restore a cleaner, healthier home.

Top 5 Areas Mold Hides in Homes and How Testing Can Help

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While visible mold growth is easy to spot, hidden mold can be a sneaky problem that thrives in unexpected places. Identifying these areas early on is crucial, and mold testing services can help ensure every trace of mold is discovered. Here are the top five areas where mold often hides in homes and how professional testing can help.

Behind Walls

Mold growth behind walls is common, especially in areas where plumbing leaks or condensation occurs. Drywall and insulation provide an ideal environment for mold to thrive, often unnoticed for months or even years. Since you can’t see behind walls, professional mold testing services can detect the presence of hidden mold by analyzing air quality and using specialized equipment.

Under Carpets and Flooring

Moisture from spills, flooding, or high humidity can seep beneath carpets and flooring, creating a perfect breeding ground for mold. Mold can grow on the padding or subfloor, often remaining hidden until the damage becomes severe. Mold testing can identify the issue before it becomes visible, saving you costly repairs.

Inside HVAC Systems

Your HVAC system—including air ducts, filters, and coils—is another common hiding spot for mold. The combination of dust, moisture, and darkness makes HVAC systems a prime environment for mold growth. Mold in your HVAC system can spread spores throughout your home, affecting indoor air quality. Testing ensures that your entire system is inspected and safe for use.

Underneath Sinks and Around Plumbing

The cabinets under sinks and areas around plumbing fixtures are hot spots for hidden mold. Leaky pipes or trapped moisture create a perfect environment for mold to flourish. Often overlooked during routine cleaning, these areas can be easily tested for mold using moisture meters and air sampling techniques.

Attics and Basements

Attics and basements are particularly vulnerable to hidden mold due to poor ventilation, high humidity, and potential leaks. Mold in these areas can go unnoticed for years, especially in unused or infrequently visited spaces. Professional mold testing can identify mold problems in these areas before they spread to the rest of your home.

How Mold Testing Ensures Complete Identification

Mold testing services go beyond what the eye can see. Professionals use advanced tools and techniques to detect mold, including:

  • Air Sampling: Measures the concentration of mold spores in the air, helping to identify hidden mold sources.
  • Surface Testing: Involves swabbing or tape-lifting surfaces to determine the presence of mold.
  • Moisture Mapping: Identifies areas of excess moisture that could lead to hidden mold growth.

By pinpointing the exact locations of hidden mold, testing ensures a comprehensive approach to remediation and prevention.

Protect Your Home with Professional Mold Testing

Hidden mold can cause serious damage to your home and health if left unchecked. Mold testing services provide peace of mind by identifying mold in even the most concealed areas. If you suspect hidden mold in your home, don’t wait—contact a professional mold testing company to ensure your home is safe and mold-free.

For expert mold testing and remediation, trust Mold Solutions & Inspections. Our team is dedicated to protecting your home and health with thorough and reliable services. Schedule your mold testing today!

The Impact of Humidity

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Humidity plays a crucial role in the health of your home and can significantly impact the likelihood of water damage and mold growth. Understanding how humidity levels affect your environment is essential for homeowners looking to maintain a safe and healthy living space. In this blog, we’ll explore the relationship between humidity, water damage, and mold, and provide tips for managing humidity levels in your home.

What is Humidity?

Humidity refers to the amount of moisture in the air. It’s typically expressed as a percentage, with higher percentages indicating more moisture. Relative humidity levels above 60% can create an environment conducive to mold growth and other moisture-related issues.

How Humidity Contributes to Water Damage

  1. Condensation: When warm, humid air comes into contact with cool surfaces, such as windows or pipes, condensation occurs. This moisture can accumulate and lead to water damage, especially if not addressed promptly.
  2. Increased Water Table: High humidity can be indicative of a rising water table, which can lead to groundwater seepage. This can cause water to enter basements and crawl spaces, resulting in significant damage.
  3. Material Saturation: Prolonged high humidity can cause building materials—like wood, drywall, and insulation—to absorb moisture, weakening them and making them more susceptible to damage.

The Link Between Humidity and Mold Growth

Mold thrives in moist environments, and high humidity levels can create the perfect conditions for mold spores to grow. Here’s how:

  • Optimal Growth Conditions: Mold spores need moisture to germinate and grow. When humidity levels exceed 60%, they can quickly multiply, leading to infestations within 24 to 48 hours.
  • Hidden Mold: High humidity can lead to mold growth in hidden areas, such as behind walls or under carpets, making it difficult to detect until significant damage has occurred.
  • Health Risks: Mold can pose health risks, including respiratory issues, allergies, and other health problems. Managing humidity is crucial for protecting your home and your family’s health.

Tips for Managing Humidity in Your Home

  1. Use Dehumidifiers: Investing in a commercial grade dehumidifier can control humidity even in the harshest conditions preventing the chance of mold. Units should be sized correctly and able to handle the work load, as most plastic made brands can not.
  2. Improve Ventilation: Ensure proper ventilation in your home, particularly in areas like kitchens and bathrooms. Use exhaust fans to reduce moisture buildup during cooking and showering.
  3. Seal Leaks: Regularly inspect your home for leaks or gaps in windows, doors, and roofs. Seal these areas to prevent moisture intrusion.
  4. Monitor Indoor Humidity: Use a hygrometer to monitor humidity levels in your home. Aim to keep indoor humidity between 30% and 50% for optimal comfort and mold prevention.
  5. Address Water Damage Promptly: If you experience water damage, address it immediately. Quick extraction and drying can prevent mold growth and further damage.

Managing humidity is a vital part of maintaining a healthy home environment. By understanding its impact on water damage and mold growth, homeowners can take proactive steps to protect their properties. Elevated levels of humidity can lead to rapid mold growth and structural damage to your property. For further assistance, contact a team member at Mold Solutions & Inspections for a free consultation.

Identifying Mold on Carpeting

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Just because mold is not immediately apparent or visible on a carpet’s surface does not mean that mold growth is not in progress. In fact, mold will probably only be visible on the surface of carpets in unusually severe cases of growth, such as carpet damaged in flooding that has remained wet for some time. The following are some examples of identifiable instances where mold growth has occurred or is likely to occur:

  • Visible Mold Growth: As stated above, this can be a rare case, but sometimes it may be obvious from visual inspection that mold growth is occurring. Carpet in this condition is most likely not salvageable and should be disposed of and replaced. Often, even if mold growth is not visible on the top of carpeting, it may be occurring underneath the carpet where it can’t be easily seen. Carpet suspected of containing mold should always be examined on both sides.
  • Carpet Mildew: Any discoloration or odor on carpeting that might be described as mildew is probably a case of mold.
  • Wet or Water-Damaged Carpet: Any carpet that has been subjected to water damage from flooding or standing water will most likely need to be disposed of. Conditions are ripe for mold growth, in this case. Even if visibly apparent mold growth has not yet begun, it is highly likely to happen unless the carpet is completely removed, cleaned and dried within 24 to 48 hours. Even then, removal and cleaning are not guaranteed to prevent mold growth. It is more likely that the carpet will need to be replaced.
  • Wet Padding Beneath Carpet: If padding beneath the carpet has become wet for any reason, or has become moist from condensation, the padding as well as the carpet on top are at risk for mold growth. The padding may need to be replaced, as will the carpet, in some cases.
  • Basement Carpet: Carpeting in basements below grade level is especially at risk in areas where humidity is high, or where wide temperature swings can produce condensation.
  • Odors and Stains: There is a wide range of things that can cause odors and stains on carpets. If mold is suspected, samples can be taken and sent for analysis to determine if mold growth has occurred.

What is Acremonium? 

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With wet conditions, Acremonium grows quite well.. When Acremonium is found indoors, it usually originates either from outdoor air or from contaminated crawl spaces or from contaminated building materials that recently experienced wet conditions like flooding. However, the spores of this fungus are formed in a slimy mass resulting in limited aerosolisation: therefore its prevalence may be low in air samples.

It grows indoors on building materials such as drywall, acoustic and thermal fiberglass insulation and in some cases insulated ducting. Crawl spaces, wet bathrooms with a lack of proper ventilation or exhausting and continuous wet basements are ideal for Acremonium. 

Acremonium has often been associated with contamination by Stachybotrys chartarum, which is often referred to as “Black Mold,” as both fungi is favor very wet circumstances. Allergenic reactions to Acremonium includes hay fever, asthma, hypersensitivity and pneumonitis. Potential opportunist or pathogen effects are known to cause hyalohyphomycosis, keratitis, mycetoma, and onychomycosis. Also known to cause infections in immunodeficient patients and causes infections in persons with wound injuries.

When mold is found in your home, trust the professionals at Mold Solutions & Inspections to properly handle the removal the first time under the guidance of the IICRC protocols.