Published On:
May 20, 2024

Mould In The House: Guide For Eradicating

Mould in the house is not just an unsightly inconvenience; it poses serious health risks and can compromise the structural integrity of your home. As microscopic organisms, mould spores are omnipresent in the environment, but when conditions are right, they can lead to mould growth indoors. Understanding how to prevent and address mould in your home is essential for maintaining a healthy indoor environment for you and your family.

Mould, commonly known as mold in some regions, can take various forms and thrive in diverse environments. From wet cellulose materials to damp spots in crawl spaces, mould can colonize practically anywhere with excess moisture. In this comprehensive guide, we'll delve into what mould is, its various types, symptoms of exposure, and effective strategies for prevention and remediation.

Explaining Mold

Mould, often referred to as mold, encompasses a diverse group of fungi that grow in multicellular filaments called hyphae. These organisms play a crucial role in breaking down organic matter in the environment, but when they infiltrate our living spaces, they can trigger a host of health problems. Mold spores are microscopic and can be transported through the air, easily infiltrating our homes through open windows, air conditioners, and on clothing or pets.

Mould growth indoors typically occurs in areas with excess moisture, providing suitable nutrients for its proliferation. Common indoor molds include black mould, Aspergillus, Penicillium, and Cladosporium, each presenting varying degrees of health risks. The musty smell associated with mould is often the first indication of a mould problem in the house, signaling the need for immediate action to prevent further growth and potential health complications.

Types of Mold

Black Mould

Also known as Stachybotrys chartarum, black mould is notorious for its toxic properties and is commonly found in areas with chronic moisture exposure, such as leaky pipes or damp basements.


This genus comprises over 180 species of mould, some of which can cause allergic reactions and respiratory issues in susceptible individuals. Aspergillus thrives in damp environments, often colonizing damp spot in crawl spaces and poorly ventilated areas.


While some species of Penicillium are used in the production of antibiotics, others can trigger mould allergies and produce toxins harmful to human health. Penicillium often grows on decaying organic materials like food or damp ceiling tiles.


Commonly found outdoors, Cladosporium can also infiltrate indoor environments, particularly in damp areas like bathrooms and laundry rooms. Exposure to Cladosporium spores can lead to allergic reactions and respiratory issues.


This mould genus thrives in damp environments and is commonly found in areas with water leaks or excessive moisture. Alternaria spores are a common trigger for mould allergies and can exacerbate respiratory conditions like asthma.


Chaetomium is typically found in water-damaged buildings and is known for its ability to break down cellulose-rich materials. Individuals with weakened immune systems are particularly susceptible to experiencing allergic reactions and respiratory issues upon exposure to Chaetomium spores.

Signs of Mold Exposure

1. Nasal Congestion

Inhaling mold spores can irritate the nasal passages, resulting in congestion and breathing difficulties, especially among individuals with pre-existing respiratory conditions.

2. Runny Nose

Allergic reactions to mould can manifest as a runny or stuffy nose, accompanied by sneezing and itching.

3. Respiratory Issues

Prolonged exposure to mould can exacerbate respiratory conditions such as asthma, leading to wheezing, coughing, and shortness of breath.

4. Skin Irritation

Direct contact with mould or its spores can cause skin irritation, redness, and itching, particularly in individuals with sensitive skin.

5. Eye Irritation

Mold exposure can irritate the eyes, causing redness, itching, and watery eyes. Protective eyewear is recommended when cleaning mould to prevent irritation.

Causes of Mold

1. Excess Moisture

Moisture is the primary catalyst for mould growth indoors. Areas with high humidity levels or water leaks provide ideal conditions for mould to thrive, leading to mould growth on surfaces like walls, ceilings, and floors.

2. Poor Ventilation

Inadequate ventilation traps moisture indoors, creating a conducive environment for mould growth. Areas such as bathrooms, kitchens, and basements, which generate high levels of moisture, are particularly susceptible to mould infestation in the absence of proper ventilation.

3. Water Damage

Water damage from leaks, flooding, or plumbing issues can introduce moisture into the home, promoting mould growth. Wet areas, such as damp patches on walls or ceilings, provide the perfect breeding ground for mould spores to proliferate.

4. Organic Materials

Mould requires organic materials to feed on for growth and reproduction. Common household items like wood, paper, fabric, and cardboard provide ample nutrients for mould to thrive, especially in moist environments.

5. Lack of Maintenance

Neglecting regular maintenance tasks, such as fixing leaks, cleaning gutters, and ensuring proper drainage, can contribute to mould growth in the home. Addressing maintenance issues promptly helps prevent moisture buildup and subsequent mould infestation.

How Mold Enters Homes

Airborne Spores

Mould spores are ubiquitous in the environment and can easily infiltrate homes through doors, windows, HVAC systems, and on clothing or pets. Once inside, these spores can settle on surfaces and initiate mould growth under favorable conditions.

Contaminated Items

Household items like furniture, clothing, and books can harbor mould spores if exposed to damp or humid environments. Bringing contaminated items into the home can introduce mould spores and contribute to indoor mould growth.

Human Activity

Human activities such as cooking, showering, and doing laundry generate moisture and humidity, creating an environment conducive to mould growth. Improper ventilation during these activities can exacerbate the problem by trapping moisture indoors.

Treating Mold Issues

When mould infiltrates your home, prompt treatment is essential to mitigate its harmful effects and prevent further proliferation. Here are effective strategies for addressing mould infestations:

Identify and Remove the Source

Begin by locating the source of moisture that is fueling the mould growth. This could be a leaky pipe, a damp patch on the wall, or inadequate ventilation in areas like bathrooms and basements. Once identified, take steps to repair the source of moisture to prevent mould from recurring.

Cleaning Mold

Use appropriate cleaning solutions and techniques to remove visible mould from affected surfaces. For hard surfaces, a mixture of water and detergent can be effective in scrubbing away mould. For porous materials like drywall or carpeting, professional mould removal may be necessary to ensure thorough elimination.

Air Purification

Invest in air purifiers equipped with HEPA filters to remove mould spores and other airborne contaminants from the indoor environment. Proper ventilation, such as opening windows and using exhaust fans, can also help improve indoor air quality and prevent mould growth.

Professional Remediation

In cases of severe mould infestation or widespread contamination, seeking professional mould remediation services may be necessary. Trained experts can assess the extent of the mould problem, implement appropriate remediation techniques, and ensure that the affected areas are thoroughly cleaned and sanitized.

Preventive Measures

Once the mould has been treated and removed, take proactive measures to prevent its recurrence. This includes maintaining optimal indoor humidity levels, fixing any water leaks promptly, and implementing proper ventilation in moisture-prone areas.

Mold and Your Health

Exposure to mould can have serious implications for both physical health and indoor air quality. Here's how the most common indoor molds can impact health and well-being:

  1. Mold Allergy: Individuals with mold allergies may experience reactions like sneezing, coughing, itching, and nasal congestion when exposed to mold spores. In severe instances, mold allergies can worsen asthma symptoms and cause respiratory distress. Additionally, mould mites can exacerbate these allergic responses.
  2. Immune System Effects: Certain types of mould produce mycotoxins, which are toxic substances that can harm the immune system and compromise overall health. Prolonged exposure to mycotoxins may increase the risk of developing immune-related disorders and other systemic health problems.
  3. Indoor Air Quality: Mould growth in the home can significantly degrade indoor air quality, leading to discomfort and health issues for occupants. Airborne mould spores can circulate throughout the home, contaminating the air and contributing to respiratory problems and allergic reactions.

Preventing Mold Growth

Preventing mold growth in your home is crucial for maintaining a healthy living environment. By implementing proactive measures, you can effectively prevent mold growth and ensure the well-being of your household.

  1. Moisture Control: Controlling moisture is paramount in preventing mold growth. Keep indoor humidity levels below 60% to discourage mold proliferation. Utilize dehumidifiers in areas prone to dampness, such as basements and bathrooms, and promptly repair any leaks to eliminate moisture sources that foster mold growth.
  2. Effective Cleaning: A mould cleaning service is vital for keeping household mold at bay. Professional cleaners pay special attention to areas prone to moisture, such as bathrooms, kitchens, and basements. They also use appropriate cleaning products to thoroughly remove mold and prevent its recurrence. Cleaners don't overlook areas where they smell mold, as this could indicate hidden growth.
  3. Monitoring Indoor Air Quality: Stay vigilant by monitoring indoor air quality to detect early signs of mold growth. Invest in air quality monitors to track humidity levels and identify areas of concern. By catching potential issues early, you can take proactive measures to prevent mold growth and safeguard your home and family.

Helpful Tips for Delaying with Mold

  1. Merely painting over mould won't suffice. Concealing mould with paint doesn't address the root cause. Effective mould removal is necessary to eradicate the problem at its source and thwart future growth.
  2. Beyond weather conditions, mould can thrive due to leaks. Leakages, whether from pipes, roofs, or windows, provide optimal conditions for mould proliferation. Swiftly addressing leaks is vital to halt mould infestation.
  3. Certain homes are more susceptible to mould growth, influenced by location. Geographical factors or specific home features, like inadequate ventilation or high humidity, heighten vulnerability to mould. Recognizing your home's unique risk factors empowers proactive measures to mitigate them.


For expert assistance in managing mold problems, consider reaching out to Nimbus Homes. Protect your home and loved ones from potential health hazards associated with mold, including allergic reactions triggered by exposure to mold species. With diligence and the right strategies, you can maintain a healthy indoor environment and prevent mold from taking root and thriving in your living spaces.