how to prevent mould on walls

How To Remove Mould From Walls – Mould Removal Guide 2024

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Key Takeaways:

  1. The Importance of Mould Removal: Mould, a fungus thriving in damp environments, poses health risks, structural damage, unpleasant odours, and aesthetic issues. Prompt mould removal is crucial to mitigate health concerns, prevent structural damage, and improve indoor air quality.
  2. Safety Precautions and Tools for Mould Removal: Before embarking on mould removal, meticulous planning and essential safety precautions are necessary. Wearing appropriate personal protective equipment (PPE) such as gloves, goggles, and a respirator help prevent mould spore inhalation and direct contact.
  3. Step-by-Step Mould Removal Process and DIY Solutions: The mould removal process involves systematic steps, including clearing the area, protecting surrounding surfaces, creating a mould cleaning solution, and scrubbing affected walls.

Mould is a type of fungus that can grow indoors and outdoors. It thrives in damp, humid, and poorly ventilated environments. Mould should be removed promptly due to the various concerns it poses. 

>> Related Reading; Positive pressure ventilation

Mould negatively impact our health, causing respiratory issues and allergic reactions. It can also lead to structural damage, unpleasant odours, and unsightly appearances.

Additionally, removing mould helps prevent its further spread to other areas, improves indoor air quality, and ensures a healthier and more comfortable living or working environment.

Mould removal takes meticulous planning to guarantee your safety and that of others. Before undertaking mould eradication, make sure you have the right tools and supplies.

>> Related Reading; How to Prevent Mould on Walls – 9 Pro Tips From the Expert

Essential Safety Precautions Before Removing Moulds From Walls

Mould can cause respiratory problems and allergies. Before accessing the affected area, wear gloves, goggles, and a respirator.

This prevents mould spore inhalation and direct contact. Open windows and use fans before removing. This will increase airflow and reduce mould spores. Isolate the damaged area to prevent mould from spreading. 

Seal vents and doors with plastic sheets and duct tape. This containment will help control the removal. HVAC systems distribute mould spores.

Turn off the HVAC system to avoid spore circulation during removal. A competent HVAC expert can clean and inspect the system following mould eradication.

Gathering the Necessary Tools and Supplies For Mould Removal

Select a mould cleaning solution for your surface. You can buy mould cleansers or build your own with bleach and water (1 part bleach to 10 parts water).

Use chemical cleaners according to manufacturer recommendations. Scrub mouldy surfaces with stiff-bristled brushes, scrubbing pads, or abrasive sponges. 

Make sure the tools are clean and suited for the surface. Mouldy things must be contained in plastic sheets and trash bags. Protect furniture, floors, and other valuables with heavy-duty plastic sheeting. To avoid contamination, double-bag mouldy goods.

Safety requires proper PPE. Get disposable gloves, goggles, and a mould-removal respirator mask. Use and fit according to manufacturer instructions. 

Wet or HEPA-filtered vacuums can remove extra water and dirt from the affected area. To trap mould spores, use a vacuum with a HEPA filter.

Mark the mould removal area with warning tape and safety signage. This will warn others to avoid the hazardous area and avoid health concerns. 

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Step-by-Step Mould Removal Process

Mould removal must be systematic to be successful and comprehensive. This step-by-step instruction will help you remove mould from walls by cleaning the area, safeguarding adjacent surfaces, eliminating the mould, and removing stubborn mould stains. 

Clearing the Area and Protecting Surrounding Surfaces

 Remove all furniture, decorations, and belongings from the affected area. This will make washing the walls easier and prevent damage or contamination. Plastic sheets or drop cloths protect floors and other surfaces from mould spores and cleaning solutions. Make sure the plastic sheets are properly fastened to prevent leaks.

Removing Mould from Walls: Techniques and Methods

 Start by making a mould cleansing solution. Use a professional mould cleaner or mix equal parts bleach and water. Spray the solution to apply it.

To avoid mould spores and cleaning chemicals, wear gloves, goggles, and a mask. Lightly spritz the afflicted area with the cleaning solution. This dampens mould and prevents spore discharge during cleaning. 

>> Related Reading; Damp vs Mould – Understanding The Differences

Scrub mouldy walls gently with a stiff-bristled brush or sponge. Remove the mould with mild pressure in circular motions.

Mould may infiltrate porous surfaces like drywall and wallpaper. Mould damage may necessitate wall replacement. Wipe the walls with a moist towel after scrubbing to eliminate mould and cleaning solution. 

To avoid cross-contamination, wipe with a new cloth. Dry walls. Ventilation and airflow speed drying. Covering moist walls with paint might increase mould growth.

Dealing with Stubborn Mould Stains

After cleaning, mould spots may persist on walls, use different cleaning methods for tough mould spots. Vinegar removes mould naturally.

Spray the discoloured areas with a vinegar-water mixture. Scrub it after a few hours. Commercial mould stain removers can remove harder stains. Follow the manufacturer’s application and safety guidelines. 

After stain removal, rinse the walls with clean water to remove the cleaning solution residue. After cleaning and drying the walls, check for mould. To prevent mould, fix any moisture concerns like leaks or high humidity.

Natural and DIY Mould Removal Solutions

Mould eradication doesn’t often require harsh chemicals or industrial cleaners. Natural and DIY mould remedies work well. Vinegar, baking soda, hydrogen peroxide, and other homemade mould cleaners are covered in this article.

Using Vinegar, Baking Soda, and Hydrogen Peroxide


Mould may be removed using vinegar. Its acidity kills mould and prevents regrowth. Use vinegar to remove mould from the following steps:

a)    Fill a spray bottle with distilled white vinegar.

b)    Spray the vinegar directly onto the mouldy surfaces.

c)    Let it sit for about an hour to penetrate the mould.

d)    Scrub the area with a brush or sponge to remove the mould.

e)    Wipe the surface clean with a damp cloth.

Baking Soda

Baking soda can also eradicate mould. It kills mould and absorbs moisture, preventing further growth. For mould removal with baking soda, use these steps:

a)    Mix a quarter tablespoon of baking soda with water to create a paste.

b)    Apply the paste directly onto the mouldy areas.

c)    Let it sit for a few minutes to allow the baking soda to work.

d)    Scrub the mouldy surfaces using a brush or sponge.

e)    Rinse the area with water and wipe it clean.

Hydrogen Peroxide

Hydrogen peroxide kills mould as an antifungal and antibacterial agent. Hydrogen peroxide mould removal follows the steps below:

a)    Use a 3% hydrogen peroxide solution, which is commonly available in drugstores.

b)    Pour the solution into a spray bottle.

c)    Spray it onto the mouldy surfaces, saturating them completely.

d)    Allow it to sit for about 10-15 minutes.

e)    Scrub the area to remove the mould.

f)     Rinse the surface with water and wipe it dry.

Effective Homemade Mould Cleaning Remedies

 Tea Tree Oil

Tea tree oil is a natural fungicide that may be used to kill mould spores as well as inhibit their growth.

a)    Mix two teaspoons of tea tree oil with two cups of water in a spray bottle.

b)    Shake the bottle well to blend the solution.

c)    Spray the mixture onto the mouldy surfaces.

d)    Leave it on for a few hours or overnight.

e)    Scrub the area with a brush or sponge.

f)     Wipe the surface clean with a damp cloth.

Grapefruit Seed Extract

Grapefruit seed extract is another natural antimicrobial agent that may effectively kill mould and inhibit its growth.

a)    Mix 10 drops of grapefruit seed extract with two cups of water in a spray bottle.

b)    Shake well to combine the solution.

c)    Spray it onto the mouldy surfaces.

d)    Leave it on for about 10 minutes.

e)    Scrub the area to remove the mould.

f)     Rinse with water and wipe dry.

Commercial Mould Removal Products

Commercial mould removal chemicals can help eliminate moderate to severe mould infestations and tough mould stains. Professional cleaners designed to remove mould can save time and effort. Commercial mould cleansers and wall surface recommendations will be covered in this article.

Exploring Professional-Grade Mould Cleaners

Bleach-Based Cleaners: Many commercial mould eradication products include bleach. Bleach eliminates mould and stains. It may stain or damage some surfaces. Use bleach-based cleansers safely by following the manufacturer’s recommendations.

Ammonia-Based Cleansers: Ammonia is another popular element in commercial mould cleansers. It kills mould spores and is antimicrobial. Ammonia is dangerous, so use it carefully. Using ammonia-based cleaners with bleach or other cleaning chemicals can cause dangerous fumes, so ventilation is essential.

Enzymatic Cleaners: Enzymatic cleaners remove mould more environmentally. These cleansers dissolve mould with enzymes. Enzymatic cleansers are suitable for most surfaces and emit no harsh fumes. For people who prefer natural cleaning, it may take longer than bleach or ammonia-based solutions.

 Choosing the Right Products for Different Wall Surfaces

Painted Walls: Use a paint-safe mould cleaner on painted walls. Look for painted wall-safe items. Abrasive cleaners can harm paint. To avoid discoloration or damage, test the product on a small, inconspicuous area before applying it to the wall.

Drywall: Porous plasterboard absorbs moisture and promotes mould growth. Choose porous-surface mould cleaners for plasterboard. These cleansers can penetrate pores to kill mould spores. Avoid plasterboard damage by following manufacturer guidelines.

Wallpaper: Mould can ruin wallpaper. Choose a wallpaper-safe mould cleaner. Find wallpaper-friendly or delicate surface products. To avoid wallpaper peeling or tearing, avoid using too much water or scrubbing.

Wood Surfaces: Wood surfaces need safe and effective mould cleaning. Look for wood-specific commercial mould cleaners. These solutions should penetrate wood and kill mould without damaging or discolouring it. Before treating the wood, test the cleaner on a tiny, inconspicuous area.

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5Preventing Future Mould Growth

Preventive actions are essential after eliminating mould from walls. Controlling moisture and ventilation prevents mould growth. This article will help you keep your home mould-free by controlling moisture and preserving mould-free walls.

➜ Moisture Control and Ventilation in Rooms

Keep your home’s humidity under 50%. Dehumidify basements, bathrooms, and kitchens. Fix plumbing leaks quickly and ventilate these locations. Good airflow prevents mould formation. Bathroom and kitchen exhaust blowers remove moisture and steam. 

Use fans and open windows to circulate the air. Trickle or air vents can increase ventilation in enclosed places. Cold surfaces can condense, allowing mould growth. Avoid condensation by insulating pipes, windows, and walls. Insulation with a moisture barrier prevents moisture from entering the walls. 

Houseplants enhance humidity. To avoid excess moisture, water plants carefully and drain well. Put a tray under the pots to catch water.

Dry carpets, rugs, and upholstery immediately. To dry thoroughly, use a wet vacuum or extractor. Dry spills and wet garments or towels immediately.

➜ Tips for Maintaining Mould-Free Walls

Regular Cleaning: Clean your walls regularly to avoid dust, filth, and mould. Wipe the walls with a damp cloth or sponge in damp areas like bathrooms and kitchens.

Check for leaks: Check your walls for water stains, peeling paint, and bulging wallpaper. Fix leaks immediately to prevent mould growth.

Monitor Condensation: Look for condensation on windows, walls, and other surfaces. Remove the condensation and fix the cause, such as poor insulation or ventilation.

Proper Sealing: To avoid moisture entry, seal windows, doors, and wall openings. Seal cracks using weather-stripping and caulk.

Remove clutter: Clutter can block airflow and foster mould growth. Airflow and mould prevention are improved by organising and decluttering your living environment.

Maintain exterior drainage: check your gutters, downspouts, and drainage systems. Proper outside drainage prevents water from entering walls and generating moisture issues.

Monitor Indoor Humidity: Use a hygrometer to monitor indoor humidity. Dehumidifiers or ventilation can lower humidity above the required range.

Professional Mould Removal Services

Some mould problems can be solved by DIY means, but others require expert mould removal. Mould remediation professionals can locate, contain, and eliminate mould.

This article discusses when to hire a mould remediation professional and how to do it.

When to Seek Professional Assistance

Consult a specialist if the mould infestation is large (more than 10 square feet) or expanding rapidly. Mould eradication may require specialised equipment and methods. Mould lurks in attics, walls, and HVAC systems. 

Professionals can use moisture metres, thermal imaging, and air sampling to find hidden mould sources if you suspect hidden mould or smell a musty odour without visible mould.

If you or anybody in your household has severe allergic reactions, respiratory troubles, or other health issues related to mould exposure, seek expert help. They can determine mould pollution, health hazards, and repair methods. 

Mould damages plasterboard, wood, and insulation. Professionals can analyse mould damage and offer repairs or replacements. Mould remediation experts can solve difficulties.

They understand mould types, growth patterns, and containment, removal, and preventive methods. Their expertise ensures comprehensive and safe mould remediation.

>> Also Read; Is Black Mould Dangerous to Health?

Hiring a Qualified Mould Remediation Expert

Find licenced, insured, and certified mould remediation providers. To confirm they are qualified, check their credentials, such as IICRC certifications. Ask about mould remediation experience. Ask how long they’ve been in business and if they’ve completed similar mould treatment operations. 

Experts can solve difficult mould concerns. Before giving an estimate, a good mould treatment firm should inspect your premises.

They should assess the mould problem, identify its causes, and create a complete repair plan. Get written estimates from multiple mould remediation firms. Estimates should detail services, scope, and costs.

 Make sure the contract covers containment, removal, disposal of mould-contaminated materials, and post-remediation certification. Contact prior clients of the mould remediation company for references. Read online reviews to assess the company’s reputation. Ask the mould remediation firm about warranties. 

Reputable companies guarantee their remediation work. Make sure the mould remediation firm meets EPA and OSHA requirements. Choose a mould remediation business that listens, addresses your issues, and acts professionally. They should be responsive, transparent, and communicate repair progress often.

Picture of Jake Fitzgerald - Damp Surveyor

Jake Fitzgerald - Damp Surveyor

Surveyor of Timber & Dampness in Buildings (CSTDB) & ( MRICS ) Chartered Quantity Surveyor

Jake is a qualified chartered quantity surveyor and experienced damp specialist with a unique skill set in thermal imaging. With a focus on effective solutions, Jake combines his expertise in quantity surveying and thermal imaging to accurately assess and address damp-related issues. He utilises advanced technology to identify hidden moisture sources and develop targeted strategies, ensuring comprehensive and cost-effective solutions for his clients. With a commitment to open communication and client satisfaction, Jake delivers cutting-edge solutions that tackle damp challenges head-on.

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