Published On:
January 8, 2024

Types Of Mould You Must Watch Out In Your Home

Mould growth in households is a common problem that most homeowners face. Not only is it unsightly, but it can also pose serious health risks if left unaddressed. To effectively deal with mould growth, it's important to understand the different types of mould that can occur in your home.

In this article, we will explore the most common mold species that are found in households, the potential problems they can cause, and how to effectively remove and prevent their growth.

What is Mould?

Mould is a type of fungus that thrives in damp and humid environments. It reproduces by releasing spores into the air, which can then settle on surfaces and grow into colonies. Mould can grow on a variety of materials, such as damp soil, wooden surfaces, fabric, and even food. It's commonly found in damp areas with excess moisture, such as bathrooms, basements, and kitchens.

Common Species of Mould in Households

Species of mould that may commonly be found in households may be confusing to some as they may look similar to each other at first glance, especially to those who are inexperienced and untrained, but these common molds still have certain distinct characteristics, explained as follows:

Stachybotrys ("Black Mold")

Stachybotrys, the species commonly referred to as the toxic black mould, is one of the most well-known types of mould. It has a greenish-black colour and a slimy texture. Stachybotrys thrives in areas with high humidity and can often be found in bathrooms and basements. Exposure to black mould can cause a variety of health issues, including respiratory problems, allergies, and even neurological symptoms.


Aspergillus is a common mould species that can be found both indoors and outdoors. It has a fuzzy texture and can come in various colours, including green, yellow, and white. While most species of Aspergillus are harmless, some can produce mycotoxins that can be harmful to humans. Exposure to Aspergillus can cause respiratory problems, especially in individuals with weakened immune systems.


Mucor is a fast-growing white or grey mold species that thrives in warm and humid conditions. It has a cottony texture and can come in various colours, such as white, grey, or brown. Mucor can often be found in areas with water damage, such as leaky pipes or roofs. While Mucor is generally harmless to healthy individuals, it can cause severe infection in individuals with weakened immune systems.


Penicillium is a common green mould species that is often found in damp and poorly ventilated areas. It has a fuzzy texture and can come in various colours, including blue, green, and white. While some species of Penicillium are used to produce antibiotics, others can produce mycotoxins that can be harmful to humans. Exposure to Penicillium can cause respiratory problems, allergies, and even sinus infections.


Trichoderma is a mould species that is commonly found in areas with high humidity and water damage. It has a woolly texture and can come in various colours, such as green, white, or yellow. While Trichoderma is generally harmless, it can cause respiratory problems and allergies in individuals with weakened immune systems.

Should Mould Growth Be a Cause of Concern?

Now that we have explored the common types of mould found in households, let's discuss why mould growth should be a cause of concern for homeowners.

Structural Problems in Your Home

Mould growth can cause structural problems in your home. It can deteriorate the materials it grows on, such as wood and drywall, leading to costly repairs. Additionally, mould can weaken the structural integrity of your home, posing a safety risk to you and your family.

Health Problems

Mould growth can also lead to a variety of health problems. Exposure to mould spores can trigger allergies, asthma attacks, and other respiratory issues. It can also cause skin rashes, eye irritation, and even neurological symptoms. Individuals with weakened immune systems or pre-existing respiratory conditions are particularly susceptible to the health effects of mould.

Classifications of Harmful Mould in Households

Mould can be classified into three categories based on their potential health risks: allergenic mould, pathogenic mould, and toxigenic mould, each of which has distinct ways in which they can affect human health, from mild to severe reactions.

Allergenic Mold

Allergenic molds are the most common type of mould found in households. They can cause allergic reactions in individuals who are sensitive to mold spores.

Symptoms can range from sneezing and coughing to more severe allergic reactions such as hay fever, asthma attacks, or asthma-like symptoms. Some individuals may also exhibit skin irritation or skin infections as a response to mould under this type of classification.

While allergenic moulds may not be harmful to everyone, they can still cause discomfort and health issues for those who are allergic.

Pathogenic Mould

Pathogenic molds can cause many types of fungal infection, especially in individuals with weakened immune systems. These moulds can enter the body through inhalation or skin contact, leading to respiratory infections, sinus infections, or even pneumonia. Individuals with compromised immune systems, such as the elderly or those undergoing chemotherapy, are particularly susceptible to pathogenic mould infections.

Toxigenic Mould

Toxigenic moulds are the most dangerous types of mould found in households. Mould under the toxigenic mold group produces mycotoxins, which are toxic substances that can cause severe health problems. Exposure to toxigenic moulds can lead to respiratory problems, neurological symptoms, and even organ damage. Black mould, or Stachybotrys chartarum, is under this classification and is considered to be one of the most toxic molds that can be particularly harmful to humans.

How to Remove Mould Growth

If you discover mould growth in your home, it's important to take immediate action to remove it. Here are some steps you can take to effectively remove mould from your home:

When to Contact Professional Mould Removal Services

While small patches of mould can often be removed by homeowners, there are instances when it's necessary to contact services in professional mould removal in Singapore like that which we offer at Nimbus Homes. Here are some situations where our professional help may be required:

How to Prevent Mould Growth

Preventing mould growth is key to maintaining a healthy and mould-free home. Here are some preventive measures you can take:

Final Words

Identifying the common types of mould growth in households is essential for homeowners to effectively address this issue. By understanding the different species of common molds in your home, their potential health risks, and the necessary steps to remove and prevent their growth, you can ensure a healthy and mould-free living environment for you and your family.

Remember, if you encounter extensive mould growth or have concerns about your health, it's always best to seek professional assistance from any mould cleaning or home cleaning service. Take proactive measures to prevent mould growth, and enjoy a safe and comfortable home for years to come.