Published On:
September 18, 2023

How to Remove Mould from Walls: Expert Techniques

Mould growth is a common but serious problem that many households face. It not only looks unsightly but can also pose health risks if left untreated. In this article, we will explore what moulds are, the difference between moulds and mildew, why moulds appear on your house's walls, and most importantly, how to effectively remove mould from walls.

Understanding What Moulds Are

Moulds are a type of fungus that thrives in damp and humid environments. They reproduce by producing spores, which can become airborne and spread throughout your home.

Moulds come in various colours, including black, green, and white. They can grow on almost any surface, including walls, ceilings, and even furniture. Moulds are typically found in areas with poor ventilation, high humidity levels, and water leaks.

Moulds vs. Mildew: What's the Difference?

Before we dive into how to remove mold from walls, it's essential to understand the difference between mould and mildew, which have specific distinctions despite being types of fungi. This is because identifying whether you're dealing with mould or mildew is crucial to determining the appropriate cleaning methods.

Mildew is a surface-level fungus that appears as a powdery or fluffy substance. It's typically white or grey and is commonly found on damp surfaces, such as shower curtains or bathroom tiles. Mildew is relatively easy to remove and does not pose significant health risks.

On the other hand, moulds penetrate deeper into surfaces and can cause structural damage if left untreated. They can also trigger allergic reactions and respiratory issues in susceptible individuals.

Why do Moulds Appear on Your House's Walls?

Moulds require specific conditions to grow and thrive. Moisture is the primary factor that promotes mould growth. There are several reasons why moulds may appear on your house's walls:

Understanding the underlying causes of mould growth is also necessary for effective mold removal and prevention strategies.

Our Tips on How to Clean Mould from Walls

Now that we have a solid understanding of moulds and their causes, let's delve into the practical steps to get rid of mold from different types of interior walls.

Getting Rid of Moulds from Drywall/Painted Surfaces and Walls

To get rid of mould from drywall or painted surfaces and walls, follow these steps:

1) Prepare yourself and the area you'll be cleaning

Before starting the cleaning process, it is important to prepare yourself by wearing eye protection, long rubber gloves, a mask, and other equipment necessary to protect yourself while cleaning your home's mould-infested area.

Preparing the area you'll be cleaning is important as well. This involves removing any furniture or objects near the affected area and covering the floor with plastic sheets or old towels to protect it from potential damage caused by cleaning solutions or water.

2) Remove surface mould

Use a soft brush or a damp cloth to remove the mould from the drywall or painted walls. Make sure to do it gently but precisely, in a way that's not too hard that it may damage the surface, but not too soft that it may not remove the mould entirely. Dispose of the cloth or brush properly to prevent the spreading of the mould spores.

3) Apply a cleaning solution

For mould on drywall, mix one part bleach with three parts water to create a bleach/water solution. Spray the affected area with the solution and allow it to sit for a few minutes to also allow the killing of the mold spores.

For mould on painted walls, you can try a natural remover like white vinegar, borax, and water. Mix equal parts of vinegar and water or make a paste with borax and water, then use a spray bottle to apply this mixture to help in removing mould.

4) Scrub and rinse

After applying the cleaning solution, use a scrub brush or sponge to gently scrub the mouldy area. Make sure to meticulously do the task, ensuring you reach even the slightest corner or crevice. Rinse the area using clean water and then dry it completely using a clean cloth or towel.

Getting Rid of Moulds from Basement/Concrete Walls

Getting rid of moulds from basement or concrete walls requires a systematic approach to ensure effective removal and prevent future growth. To achieve effective mould removal from basement or concrete walls, here are the steps you may follow:

1) Safety Measures

As with any mould removal process, your safety should also be your priority. Wear protective gear such as gloves, goggles, and a mask to avoid direct exposure to mould spores, which can cause health issues.

2) Dry Cleaning

Begin by dry brushing the affected area using a brush with stiff bristles. This step helps remove loose mould spores from the surface, making it easier to tackle the underlying problem.

3) Vacuuming

Use a vacuum cleaner equipped with a HEPA filter to remove any remaining mould spores. HEPA filters are designed to trap small particles like mould spores, ensuring that they don't recirculate in the air. Dispose of the vacuum bag or clean the canister outside to prevent mold spores from re-entering your home.

4) Baking Soda Paste

Create a paste by mixing baking soda and water to form a thick consistency. Baking soda is a natural fungicide and can help kill mould spores. Apply the paste directly to the mould-infested area, making sure to cover it completely. Let the paste sit for several hours, or leave it overnight.

5) Scrubbing

After the baking soda paste has had time to work, use a brush or sponge to scrub the area vigorously. This will help loosen and remove the mould from the surface. To eliminate any remaining residue, cleanse the area by rinsing it with clean water. It's also important to make sure to dry the area thoroughly to prevent moisture that can contribute to future mould growth.

6) Sealant

Once the treated area is completely dry, consider applying a mould-resistant sealant. A mould-resistant sealant helps create a barrier that prevents mould spores from growing back. Make sure to properly apply the product by following the instructions provided by the manufacturer.

Getting Rid of Moulds from Bathroom Walls

To effectively get rid of mould from bathroom walls, follow these steps:

1) Choose an appropriate cleaning solution

There are several options for cleaning mould, including vinegar or baking soda, bleach, or commercial mould cleaners. Each option has its benefits and drawbacks, so choose the one that suits your preference and the severity of the mould problem.

2) Prepare the area

Before you begin cleaning, make sure to wear protective gear such as gloves, goggles, and a mask to avoid direct contact with the mould spores. Open windows or use fans to increase ventilation in the bathroom.

3) Apply the cleaning solution, scrub, and rinse the walls

If you're using vinegar or baking soda, apply it directly to the mouldy area and scrub with a stiff brush. For bleach or commercial mould cleaners, follow the manufacturer's instructions and let the solution sit for at least 30 minutes.

Next, use a stiff brush or non-scratch scouring pad to scrub the mould off the walls. Apply gentle pressure and work in circular motions to effectively remove the mould.

Finally, after scrubbing, rinse the walls with water to remove any residual mould or cleaning solution. This will also help to ensure that no harmful residue is left behind.

4) Dry the area

Thoroughly dry the walls and surrounding area to prevent the mould from returning. Maintain a dry and comfortable environment by using towels, fans, or dehumidifiers. If possible, increase ventilation in the bathroom by opening windows or using a ventilation fan.

5) Prevent future mould growth

To prevent mould from coming back, make sure to address any moisture issues in the bathroom. Repair any leaks, improve airflow, and decrease moisture levels to enhance ventilation. Regularly clean and dry the bathroom to prevent mould from finding a suitable environment to grow.

Natural Solutions on Killing Moulds

If you prefer to use natural solutions to your mold problem, there are several options available.

Tea tree oil is a natural fungicide that can kill mould spores. Mix one teaspoon of tea tree oil with one cup of water and apply it to the affected area using a spray bottle or sponge. Let the solution sit for 15 minutes, then rinse with water and dry the area thoroughly.

Another natural solution is grapefruit seed extract. Mix 20 drops of grapefruit seed extract with two cups of water and apply it to the affected area using a spray bottle or sponge. Let the solution sit for 15 minutes, then rinse with water and dry the area thoroughly.

Is Bleach or Vinegar Better to Kill Mould?

One common question when it comes to mould removal is whether bleach or vinegar is more effective. Both bleach and vinegar have their advantages and disadvantages.

Ultimately, the choice between bleach and vinegar depends on personal preference and the severity of the mould infestation.

Preventing Mould from Reoccurring

Removing mold from your walls is only half the battle. To prevent mould from reoccurring, consider implementing the following preventive measures:

1) Reduce Moisture

Address any sources of moisture in your home, such as leaks or excessive humidity. Repair leaks promptly and use dehumidifiers or air conditioners to control and reduce humidity levels. Similarly, you should also avoid drying clothes indoors to avoid encouraging mould growth on walls and even clothes, as removing mould from clothes may also be an additional problem to solve.

2) Improve Ventilation

Ensure proper airflow and allow more fresh air to come into your home by opening windows, using exhaust fans, or installing ventilation systems in areas prone to moisture, such as bathrooms and kitchens.

3) Insulate

Proper insulation can reduce condensation on walls. Insulate pipes to minimize the chances of leaks and moisture-related issues.

4) Regular Cleaning

Regularly clean and dry surfaces, such as shower walls or windowsills, which are prone to moisture. Remove any visible mould promptly to prevent it from spreading.

5) Use Mould-Resistant Products

Consider using mould-resistant paints or coatings in areas prone to mold growth, such as bathrooms or basements. You may opt to use a mould paint additive and mix it with the product you need to rebuild the room you're cleaning, like paint, wallpaper paste, or tile grout.

6) Employing Mould Removal Services

Professionals in mould cleaning Singapore have the expertise and tools to address the root cause of mould growth effectively. At Nimbus Homes, we make sure to effectively remove mould from problem areas in a safe and environmentally friendly way.

Final Words

Moulding on walls can be a persistent and concerning issue for homeowners. However, armed with the right knowledge and tools, you can effectively remove mould and prevent mold growth recurrence.

Remember to identify the type of mould you are dealing with, follow the appropriate cleaning methods for different wall surfaces, and take preventive measures to control moisture and promote proper ventilation.