Published On:
January 3, 2024

Removing Black Mould from Wall Surfaces

2024 Price Guide

Calculate 2024 Service Prices
With Our Interactive Price Guide

What is your Preferred Payment Method?

Selected Options and Prices

Black mould on walls is not only unsightly but can also pose a serious threat to your health and the structural integrity of your home. It is thus important to understand what black mould is, the problems it can bring, and the causes of its growth. In this article, we will explore ways to remove black mould from wall surfaces, when to seek professional help, and effective methods to prevent its growth.

What is Black Mould?

Black mould, often associated with the growth of mould species like Stachybotrys chartarum and Aspergillus niger, is a type of fungus that thrives in damp and poorly ventilated areas. It appears as black or dark green patches on walls, particularly in areas with high moisture levels. Black mould releases spores into the air, which can trigger allergic reactions and respiratory problems in individuals who are exposed to it.

What Problems Does Black Mould Growth Bring?

The presence of black mould on walls can lead to a range of problems.

Firstly, it can cause health issues such as allergies, asthma, and respiratory infections. The spores released by black mould can irritate the airways and cause symptoms like coughing, sneezing, and wheezing. Black mould growing in the household may also bring severe and life-threatening health problems in people with compromised immune systems, which are often difficult to treat.

Additionally, black mould can damage the structural integrity of your home. It feeds on organic materials such as wood and drywall, leading to decay and weakening of the affected surfaces. This can result in structural damage, compromising the stability of your walls and potentially causing costly repairs.

Causes of Black Mould Growth

Understanding the causes of black mould growth is crucial in effectively addressing the problem. Here are some common factors that contribute to its development:

Uncontrolled and Very High Humidity Levels

Excess moisture in the air is a breeding ground for black mould. High humidity levels, often above 60%, create a damp environment where mould can thrive. This is particularly common in areas with poor ventilation, such as bathrooms, kitchens, and basements.

Water Leaks

Water leaks from pipes, roofs, or faulty plumbing can create the perfect conditions for black mould to grow. Even small leaks can result in accumulated moisture behind walls, providing an ideal environment for mould growth. It is essential to address any water leaks promptly to prevent further damage and mould infestation.


Condensation occurs when warm air loaded with water vapour comes into contact with cold surfaces, causing too much moisture to accumulate. This commonly happens in poorly insulated homes, leading to dampness on external and internal walls, windows, and ceilings. If left unaddressed, condensation can promote the growth of black mould.

Underlying Damp Issue

Penetrating damp occurs when water seeps through walls due to external factors such as rainwater or faulty guttering. Rising damp, on the other hand, happens when groundwater is absorbed by porous materials like brick or concrete. Both types of damp problems can create the perfect conditions for black mould growth by bringing in constant moisture in the household, leading to damp walls or damp patches.

Ways to Remove Mould on Walls Effectively

If you discover black mould on your walls, it is important to take immediate action to remove it. Here are some effective methods for removing mould on walls:

Check for Indicators of Mould Growth

Indicators for mould growth on walls include peeling paint, discolouration, visible patches or spots, and a musty smell.

Peeling paint and discolouration often occur as a result of moisture buildup behind the walls, providing an ideal environment for mould growth. The musty smell is a clear sign of mould infestation and can help locate hidden mould sources.

Checking for these indicators is essential when removing mould from walls because it helps identify the extent of the problem and guides the remediation process.

Address Sources of Excess Moisture

Simply removing visible mould without addressing the underlying moisture issue will only provide temporary relief, as the mould is likely to return. Mould thrives in high moisture rooms, so reducing moisture levels helps create an environment that is less favourable for mould growth, ensuring a more successful and long-term mould remediation process.

Protect Yourself

Before starting the mould removal process, ensure your safety by wearing protective gear such as long rubber gloves, goggles, and a face mask. Black mould may release mould spores that may cause respiratory issues when inhaled, and this protective gear can help minimise such risk.

Dry Out the Area

Address the underlying moisture issue by fixing any leaks or improving ventilation. Use dehumidifiers or fans to dry out the affected area before attempting to remove the mould. This will help prevent its regrowth.

Clean Mould Growth Using DIY or Commercial Cleaning Agents

Mold can release airborne spores that can spread and cause health issues if left untreated. Cleaning agents specifically designed for mould removal contain ingredients that can effectively kill and remove mould from surfaces.

Here are some cleaning agents known to be effective in killing mould and its spores:

When to Contact Professional Mould Cleaning Services

In some cases, the extent of black mould growth may be beyond your capabilities to handle. It is important to recognize when it is necessary to seek professional help, preferably from Nimbus Homes. Consider contacting professional mould cleaning in Singapore under the following circumstances:

Large-Scale Infestation

If the mould covers a large area or has spread extensively throughout your home, professional intervention is recommended. Experts have the knowledge, experience, and equipment to effectively remove the mould and prevent its regrowth.

Health Concerns

If you or your family members are experiencing skin rashes, severe allergic reactions, or respiratory issues due to possible exposure to black mould and black mould spores, it's best to consult professionals. They can assess the situation, identify the underlying causes, and provide appropriate solutions to ensure your health and safety.

Hidden Mould

Toxic black mould can often hide behind walls, in crawl spaces, or within HVAC systems. Detecting and removing hidden mould requires specialized expertise and equipment. Professional mould cleaning services have the necessary tools to locate and eradicate hidden mould effectively.

Ways to Prevent Mould Growth on Walls

It's always best to take preventive measures against mould growth, as preventing such occurrences is easier than cleaning up after the damage they've caused. Take proactive steps so you can minimise the risk of mould infestation and prevent regrowth. Here are some effective ways to prevent mould growth on walls:

Consider Using Anti-Mould Paint or Anti-Condensation Paint on Your Walls

Using anti-mould or anti-condensation paint is beneficial in preventing mould growth on walls as these paints create a protective barrier that helps maintain a dry and mould-resistant surface, contributing to a healthier indoor environment:

Control Humidity

Maintain humidity levels between 30% and 50% to discourage mould growth. Use dehumidifiers in areas prone to high humidity, such as bathrooms and basements. Ensure proper ventilation by using exhaust fans or opening windows when cooking or showering.

Avoid Drying Clothes Indoors

Drying clothes indoors can contribute to increased moisture levels in the air, which can lead to mould growth on walls. When clothes dry indoors, the moisture released during the drying process saturates the surrounding air.

If the indoor space is poorly ventilated or lacks adequate airflow, this excess moisture can condense on walls, ceilings, and other surfaces, creating a damp environment conducive to mould growth.

Address Water Leaks

Regularly inspect your home for any signs of water leaks. Fix any leaks promptly to prevent moisture buildup and the subsequent growth of mould. Pay attention to areas prone to leaks, such as roofs, plumbing fixtures, and pipes.

Improve Insulation

Proper insulation can help prevent condensation on walls. Ensure your home is adequately insulated, especially in colder climates. This will reduce the temperature difference between indoor and outdoor surfaces, minimizing the chances of condensation.

Promote Air Circulation

Good air circulation is essential in preventing mould growth. Use fans and open windows to improve airflow within your home. Avoid blocking vents or air ducts and regularly clean them to ensure proper ventilation.

Regular Cleaning

Regularly clean your walls, paying attention to areas prone to moisture, such as bathrooms and kitchens. Wipe down surfaces with a mould-inhibiting cleaner to remove any potential mould spores.

Final Words

Black mould on walls is a serious issue that requires prompt action. By understanding the causes of mould growth, implementing effective removal methods, and taking preventive measures, you can maintain a healthy and mould-free home. However, if you are faced with a severe mould infestation or health concerns, do not hesitate to seek professional mould cleaning services.

Remember, prevention is key, so be proactive in addressing moisture issues and maintaining proper ventilation. With diligence and timely action, you can keep black mould at bay, ensuring a safe and healthy living environment.