Understanding The Most Common Types of Mold (And What To Do About Them)

Discovering mold in your home can be a stressful experience. Not only does mold detract from the aesthetic appeal of your living space, but it can also pose serious health risks if left untreated. Understanding how to identify and effectively deal with mold is crucial in maintaining a healthy, mold-free environment for you and your family. 

This comprehensive guide will provide step-by-step instructions to help you identify mold in your home, understand the causes of mold, and outline the necessary actions to take once it has been found. 

From determining the extent of the growth to implementing proper containment and mold remediation techniques, empower yourself with the knowledge and tools needed to tackle mold and regain control over your home’s well-being.

What Is Mold?

Mold is a fungus in the natural environment that can be found almost anywhere with moisture and oxygen. It belongs to the fungi kingdom and typically thrives in damp or humid conditions. 

Mold reproduces by producing tiny spores that can quickly become airborne and spread to different areas. When these spores land on a moist surface indoors, they can begin to grow and digest the organic matter they are growing on to survive.

Because of the environments that mold thrives in, you’ll typically find this fungus growing in damp basements, bathrooms, kitchens, and areas with water leaks or high humidity. 

Mold comes in various colors, including white, black, green, or yellow. It can have a fuzzy or slimy texture, depending on the species. There are many different types of mold, but only a few are the most common. Each type of mold has its own characteristics, prevalence, and potential health risks. We’ll look at those in the following sections.

Understanding the Most Common Types of Mold


Aspergillus includes several hundred species worldwide, some of which can cause health concerns in humans, particularly those with weakened immune systems or respiratory issues.

Aspergillus is common in indoor and outdoor environments and can grow on various organic materials, including building materials, textiles, and food items.

Aspergillus is known for its typically green or yellow appearance and its ability to produce large numbers of spores that easily become airborne and can provoke allergy-like symptoms in those exposed to them.

People can become exposed to Aspergillus mold by inhaling spores, ingesting contaminated food, or skin contact with contaminated materials.


Penicillium mold is a type of fungi that belongs to the genus Penicillium. It was first identified in 1809 by German naturalist Johann Heinrich Friedrich Link.

There are over 300 known Penicillium species, with most producing blue, green, or yellow spores. This mold is commonly found in various environments, such as soil, decaying plant debris, compost, grains, wallpaper, house fabrics, and water-damaged buildings.

Penicillium mold can cause issues both indoors and outdoors. It is one of the most common causes of fruit and vegetable spoilage and can lead to foodborne illnesses.

In indoor environments, exposure to Penicillium mold can result in allergic reactions, respiratory problems, and fungal infections, particularly in individuals with respiratory issues or weakened immune systems. The mold releases spores into the air, which can trigger allergies when inhaled.

While Penicillium mold can have negative health effects, it is important to note that it also has significant industrial importance. Some species of Penicillium are used to produce antibiotics, such as penicillin.

Stachybotrys Chartarum:

A type of black mold, Stachybotrys chartarum covers several species with a dark green or black appearance and is typically found in warm, damp areas.

Exposure to black mold can potentially cause allergic reactions and respiratory issues. However, it is worth noting that black mold typically does not cause severe illness except in rare cases. Most people who experience symptoms from black mold exposure will usually have mild to moderate allergic reactions.

However, black mold can have serious health implications for individuals with weakened immune systems, chronic respiratory conditions, or allergies. These individuals are more susceptible to experiencing severe reactions to mold exposure.

To address black mold concerns, it’s recommended to identify and eliminate the source of moisture that supports its growth, as mold thrives in damp environments. If black mold is present in significant quantities, it may require professional remediation to ensure safe removal.


Alternaria is predominantly an outdoor family of molds that grows on plants, wood, and other organic materials and prefers warm and damp areas. That being said, Alternaria can grow indoors, colonizing tiles, dry wood, plywood, paint, and polyurethane. Alternaria is known to cause agricultural spoilage, accounting for crop losses.

Alternaria is also associated with allergies and is, in fact, one of the most common mold allergens. Studies have shown that many individuals with asthma have a positive skin test for Alternaria allergens. Exposure to Alternaria and subsequent allergic reactions can contribute to the development and worsening of allergic conditions.

Most Common Causes of Mold

According to the Centers for Disease Control and Prevention, mold needs moisture, a nutrient source, and suitable temperatures to grow. Water leaks, humidity, poor ventilation, flooding, condensation, and wet clothes are the most common causes of mold.

How to Identify Mold in Your Home

Understanding the most common causes of mold is an important step in protecting your home from mold growth. Identifying it is the next step. Here’s how.

  1. Visual inspection: Look for any visible signs of mold growth. Pay attention to moisture-prone areas like bathrooms, kitchens, basements, and areas with water damage or leaks.
  2. Use your senses: Mold often has a distinct musty odor. If you notice an unusual smell in certain areas of your home, it could indicate mold growth.
  3. Check for discoloration: Look for any patches of discoloration on walls, ceilings, or floors. Mold can appear in various colors, including black, green, gray, white, or even orange, depending on the type and stage of growth.
  4. Monitor humidity levels: Mold thrives in areas with high humidity. Use a hygrometer to measure the humidity levels in your home. 
  5. Look for condensation: Check for signs of condensation on windows, pipes, or other surfaces. Excessive condensation can create a favorable environment for mold growth.
  6. Investigate hidden areas: Mold can grow in hidden areas such as behind walls or under carpets. If you suspect mold but cannot see it, consider using a moisture meter to detect hidden moisture levels, which can indicate hidden mold growth.

What to Do About Mold

Once you’ve found mold in your home, it’s important to address it promptly to prevent its growth and spread. Here is a step-by-step guide on what to do next:

  1. Determine the extent of the mold growth: Check to see how widespread the mold is and what materials are affected. If the affected area is larger than 10 square feet, it’s recommended to seek the help of a professional mold inspector.
  2. Identify the source of moisture: Mold needs moisture to grow, so it’s essential to identify and fix the source of moisture. Common sources of moisture include leaks, standing water, flooding, or high humidity levels.
  3. Isolate the area: If the affected area is small, you can try to seal it off from the rest of the house to prevent the spread of mold spores. Close doors and windows and use plastic sheeting and tape to seal openings.
  4. Wear protective equipment: It’s essential to wear protective equipment, including gloves, an N95 respirator, and eye protection, to prevent exposure to mold spores and mycotoxins, which can cause health issues.
  5. Use appropriate cleaning solutions: Clean hard surfaces with non-ammonia soap, detergent, and water. For more robust mold growth, use a solution of 1 cup of bleach per gallon of water. Avoid using bleach on porous materials such as wood or drywall, as it can damage them. Instead, consider replacing such materials.
  6. Dispose of contaminated materials: If any porous materials, such as carpets, ceiling tiles, or wallpaper are moldy, consider discarding them as they are challenging to clean thoroughly.
  7. Dry the area: After cleaning, it’s essential to dry the area appropriately to prevent mold from returning. Use a dehumidifier or air mover to circulate air in the space and keep humidity levels below 50%.
  8. Monitor the area: Keep checking for any signs of mold recurrence or other indications, such as moisture, that could encourage its growth.

Remember, if you’re unsure about how to handle mold remediation or suspect the mold growth is widespread, it’s advisable to contact a professional mold remediation specialist. They have the expertise and equipment to handle the mold safely and effectively.

Remediate Mold in Your Home With Western Disaster Clean Up

Have you discovered mold in your home? Don’t hesitate to take action. Mold growth can significantly impact your health and the structural integrity of your property. Handling mold remediation promptly and effectively is essential.

Contact Western Disaster Clean Up for professional assistance with your mold remediation needs. With our team of experienced and licensed technicians, we provide thorough and efficient mold remediation services. We utilize industry-leading techniques and equipment to ensure the complete removal of mold and the restoration of a safe and healthy living environment.

Call us at 385.955.4126 to schedule your mold remediation today.

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