How To Remove Mold From Basement Wall? Complete Step-by-Step Guide

Helen Skeates
Helen Skeates
20 min read

There are four ways to eliminate mold from a basement wall that we covered in this article. Tea tree oil is one of them.

Do you want to know more? What’s more, keep reading to learn more.

Similarities of Bacteria and Mold

In damp areas, both bacteria and mold can thrive. They are able to replicate asexually and rapidly, making them extremely virulent. Particularly if the conditions are right.

Antibacterial and antifungal soaps were developed for this very reason: to eliminate microorganisms that live on our skin.

7 Quick Ways to Remove Mold from Basement Walls

Cleanse the skin by destroying the microorganisms, while also helping to keep the skin dry. In a dry atmosphere, bacteria such as mold are unable to thrive. For mold to develop or reproduce, it needs a lot of moisture, but it’s also the simplest requirement for us all to handle.

Controlling Basement Mold

Typically, the basement is utilized as a storage room for boxes and other items that are not frequently used. When it comes to water damage, it’s understandable that you wouldn’t detect any leaks. Mold thrives in environments that are too damp. Mold growth is accelerated by a combination of water, humid air, and organic compounds.

In your basement, you’re more than likely to find a variety of molds that can cause injury.

Your basement is probably the least used and cleaned part of your house. A dehumidifier and regular cleaning are the best ways to keep mold in the basement under control or prevent it from developing in the first place.

Keeping your basement as dry as possible is your primary responsibility.

Mold Growth

Any organic substance-based object or building material will also support the growth of mold. Where organic materials are stored, mold can grow. In a moist basement, common household items such as drywall, wood, carpet, insulation, wallpaper, and even clothing and cardboard boxes can quickly develop mold.

Regularly inspecting the pipes for leaks or damage is also essential. Within two days of a basement becoming wet, some mould begin to grow. When the sun isn’t shining, basements tend to be damp, dark, and poorly ventilated.

Taking care of these issues will help prevent mold from forming in your basement. If mold is allowed to develop unchecked, it will quickly spread to other parts of the house, resulting in a worsening of the condition.

Factors to Consider

Preventing mold in your basement is as simple as keeping it clean and checking for leaks or wetness on a regular basis. Even the smell of mold in the basement can indicate the existence of the disease. Odors will build up over time because the basement is enclosed and the air movement is slow. Keep an eye out for this warning symbol.


Keep an eye out for any signs of dampness or water leaks in the basement. Repair any leaking or broken pipes. Keep a backup battery in your sump pump. It’s important to replace an ejector pump at the end of its allotted life if you have one. Most essential, if mold is found, contact a professional to ensure that the entire basement is free of mold.

If mold is not visible in your basement but you suspect it is present or you know you’ve had moisture intrusion, give us a call. We are happy to help answer any questions.

Mold On Basement Walls

Please contact us even if you do not see mold growing in your basement but believe it is there or know that there has been moisture infiltration. There is nothing we can’t do to help.

Mold can grow as a result of basement wall cavity leaks. In just one to two days, mold can grow on the stagnant water from a faulty pipe.

Mold growth in basements can also be attributed to a lack of proper drainage. Water damage can occur to your home if the gutter and downspout system is not properly installed.

Your basement and foundation are both at risk if water collects near your home’s foundation. Mold is a result of water damage. Basement water damage can also be caused by water accumulating along the foundation slope.

There is less ventilation in basements, which means that moisture is more prone to build up in the space. An further source of moisture in the basement comes from water heaters and furnaces. Mold thrives in wet environments, which is why mold infestations in basements are so common.

Methods On Removing Mold From Basement Walls

There are a variety of methods for removing mold from the walls of your basement. The following are four methods for getting rid of mold:

Method #1. Use borax

Start with a cup of borax and a HEPA-certified vacuum cleaner. You will also need a bucket and one gallon of warm water.

Mold-infested surfaces should be vacuumed with a HEPA-certified vacuum. In this way, mold spores will not be able to spread any further.

To have a better understanding of mold growth, read this article on “how fast does mold grow?”. This essay will help you understand why it is so important to contain airborne mold spores.

Step 3: To make your cleaning solution, combine the cup of borax with the pail of warm water. After that, use the solution to wet the bristle brush.

Finally, use a scrubbing brush to remove mold spores from afflicted areas and allow the solution to dry on the walls. You can leave the mixture on the walls to prevent mold from forming in the future.

Mold, Fungus, And White Peeling Painting On Old Concrete Wall Background. Suitable For Presentation And Backdrop. Stock Photo, Picture And Royalty Free Image. Image 152726558.

Method #2. Use bleach

Because of its disinfecting characteristics, bleach is the go-to disinfectant for mold removal in the house. This method, on the other hand, works better with sealed basement wall surfaces rather than the entire length of the wall.

Step 1: Get your spray bottle and safety gear ready (gloves, goggles, and respirator). Pour in a cup of bleach and a gallon of water, mixing thoroughly.

Using a spray bottle, combine some of the solutions and apply them to your basement wall’s sealed parts. Let the solution lie on the walls for a few days to kill mold and prevent additional growth.

Method #3. Use vinegar

Vinegar is a better choice for mold removal than bleach because it is less toxic. However, some people may be turned off by the stench. Using a little area of mold? This is a preferable option because it is gentler on the skin.

Step 1: Prepare a spray bottle, white vinegar, and baking soda-water solution.

Spray the moldy spots with the undiluted vinegar in a spray bottle. One hour on the walls is all it takes to get rid of mold.

Step 3: Spray a baking soda-water solution on the vinegar-saturated patches to balance the PH of the walls. Double the mold-killing efficacy of vinegar by using baking soda in the mold-killing solution.

Clean water should be used to wipe off the walls at this point.

Method #4. Use tea tree oils

Pure tea tree oils can also destroy mold, which is an unexpected benefit. It’s also more pleasant to smell than the oils discussed earlier.

To begin, gather a scrub brush, a cup of water, and a teaspoon of pure tea tree oil.

Step #2: Use a brush dipped in the tea tree oil solution to clean away any visible mold. The solution is made by combining a teaspoon of oil with a cup of water and stirring. Scrub away the mold with a dipped brush.

What Causes Mold in a Basement?

Mold spores can’t grow and spread on your basement walls unless the correct breeding conditions are present. Mold can grow in the following situations:

Excess Moisture

Moisture from condensation or leaking foundations is ideal for mold growth because it provides the ideal balance of oxygen and moisture. Electrical appliances and insufficient ventilation can also lead to condensation. Mold thrives in moist environments, which is what happens when condensation builds up.


Burst plumbing or weak foundations are two common causes of leaks. Often, this is due to a lack of care and a lack of attention. A rise in the soil water table will also produce a leak in the foundations, which will lead to basement leaks as a result. Even water heaters have the potential to have leaks from time to time.

You may have substantial flooding in your basement if you experience a full breakdown of your water heater.


Mold growth in the basement can be attributed to a number of different factors, one of which being flooding. Hydro-static pressure is caused by floods, which result in a buildup of water. To put it another way, this causes leaks and water damage, which in turn causes mold.

Sump Pump Failure

Sump pumps drain water from the pit and away from your home. As a result, the basement is dry and mold-free all year long. This pump will stop working properly if it is not properly maintained. As a result, water will collect around your foundation, causing leaks to appear in your basement. Mold thrives in a moist, dark, and warm environment like this.

Even if mold isn’t readily apparent, it’s a good idea to do a test if your basement exhibits any of the characteristics listed above.

Do-it-yourself kits can be purchased at your local supermarket, or you can hire a professional to conduct an in-home test.

Types of Basement Mold

Your cellar will get infested with numerous varieties of mold. However, not every one of them is harmful to people.

For the sake of this article, we’ll focus on two types of mold:

  • Allergenic
  • Mycotoxin/black

Asthmatics and others who are very allergic to molds should avoid exposure to allergenic molds. Humans and pets are particularly at risk from the poisonous chemicals produced by black mould.

Mold can grow in a variety of places, including your basement.


Most people are familiar with the common household mold species Aspergillus. Aspergillus is a diverse fungus that can be found in a wide variety of indoor habitats. Some Aspergillus molds are mycotoxins and should be removed by a professional, especially if the mold is black.

An ugly, dark green fungus, it grows on damp surfaces like walls and ceilings as well as furniture. It thrives in moist conditions, although it can also thrive in dry locations with high humidity or condensing water vapor.


It’s common to see Fusarium in places that are drenched to the point of saturation. Standing water, moist walls, flooded basements, and humidifier air vents are all good places to look for it. An atmosphere that is both warm and humid is not necessary for it to flourish.

Humans and pets are poisoned by the fungus’ toxic byproducts, which are often yellow in color. Because of its rapid growth and ability to spread, it should be dealt with immediately.


Cladosporium can be found in moist, humid environments. It can also survive in colder climates because it doesn’t require warm, humid conditions to thrive. Shower curtains, window sills, window air conditioners, and bathroom ceilings are all places where it can be found.


Stachybotrys, commonly referred to as “black mold,” is a mycotoxin that can be toxic to people. It’s dark brown in color and smells musty. Low light, high wetness, and wet locations are all places where it can be found.

If you don’t know what kind of mold is growing in your basement or home, it’s a good idea to seek the help of a local specialist.

What are the effects of mold on basement walls?

Upper respiratory tract problems can be caused by inhaling mold spores from indoor mould. Coughs and asthma are among the most common complaints.

Here’s an article about removing airborne mold spores if you want to learn more about mold removal. If you’re concerned about mold in your home, you may find this information useful!

It will be more worse for you if you have a mold allergy. If you have COPD and are exposed to mold, you may get hay fever-like symptoms.

Children and the elderly are particularly susceptible to the flu and other respiratory illnesses brought on by mold exposure. If you have mold in your basement, you should get rid of it as quickly as possible to minimize chronic exposure.

How To Get Rid of Basement Mold

Mold may be removed from your house and basement in a variety of methods. Be sure to address the root cause of the mold problem first, as mold growth is merely a sign of something more serious. To do this, you may need to address any leaks, make sure the basement is properly ventilated, or check for standing water.

To eradicate mold from your house and basement, there are a number of options available to you.

Mold On Concrete Wall Stock Photo, Picture And Royalty Free Image. Image 88038554.


Mold may be removed with vinegar, which is an excellent household cleaner. Use white vinegar only if it is what you have on hand when planning to use this solution. Let it lie for two to five minutes before scrubbing the mold with a sponge or a brush. After that, simply use a towel or sponge to remove the mold. This can be used on a wide range of surfaces, including porous and solid.

Tea Tree Oil

Using tea tree oil to get rid of mold on basement walls and other surfaces is a great way to get rid of it. If you’re going to use tea tree oil, make sure it’s thoroughly blended with water first. In order to get rid of mold, you first spray the mixture on the affected areas and then scrub until the mold is gone.

Grapefruit Seed Extract

Using grapefruit seed extract not only gets rid of the mold, but it also helps to keep it from coming back in the future. Simply combine the extract with water and apply it directly to the affected regions. Wait a few minutes before using the combination (five minutes should work wonders). After that, use a sponge or dry towel to remove the mold.

Hydrogen Peroxide

When it comes to mold removal, hydrogen peroxide is a convenient and non-toxic solution. Spray the afflicted areas with a mixture of water and baking soda. Scrub the mold and mildew away with a scrub brush after it has sat on the mold for 10 minutes.


If you combine Borax incorrectly, it can be dangerous if consumed, so be careful. Borax solution should be mixed with one gallon of water and a cup of the solution. Scrub the afflicted areas with a sponge or scrub brush after applying the Borax solution. Because of its deodorizing characteristics, borax is also effective at removing musty odors.

Once the Borax solution is correctly mixed, there is no need to rinse the mold- and mildew-affected surface.


Bleach is a low-cost and simple-to-use option. Once it’s been administered, you may rest guaranteed that mold and all of its spores will be killed. However, if the conditions are still good, the mold roots will be able to regenerate.

Bleach can’t be used on fabrics or carpets while treating mold infestations. Tiles, bathtubs, and other hard surfaces are not suitable for this product. If swallowed, it can be harmful as well. Bleach should only be used with extreme caution in basements with insufficient ventilation.


Mold eradication chemical Concrobium has been approved by the EPA and is non-toxic. Despite the fact that it is less hazardous than bleach, it is more expensive. Not only does it get rid of the mold infested areas, it also keeps mold from growing again on previously treated surfaces. Because it’s non-toxic, it can be used on a wide variety of surfaces compared to bleach.

High-Efficiency Particle Absolute (HEPA) Vacuum Machines

It’s possible to utilize HEPA vacuums to remove mold spores from the walls and ensure that no spores remain after the clean-up. Using a HEPA vacuum cleaner on a regular basis in locations with high humidity can also help avoid the growth of mold.

When using cleaning products, always read the label or directions to ensure that they won’t harm delicate materials or porous surfaces.

What Can You Do To Prevent Mold in a Basement?

There are a few things you can do to prevent mold from returning or from growing at all:

  1. The air in your home and basement should be filtered and cleaned using a negative air pressure system. Ducting removes all of the air from the room using the machine’s filtering system. It removes all mold spores that could lead to mold growth in the correct conditions throughout this process.
  2. Fix any foundation leaks or cracks that may be causing the problem with moisture. Check to see whether your sump pump has broken down and has to be reset and re-started.
  3. A humidity gauge and a dehumidifier should be installed in locations with excessive humidity. Moisture levels should never exceed 60 percent at any time.
  4. Use a primer and dry gypsum wall to protect your foundation. Your foundations and home won’t be flooded if the water level on the surface increases due to a storm or flash flood.
  5. Paint your home’s interior and basement walls with mold inhibitor mixed into the paint.
  6. Your gutters should not be clogged, and all water should be directed away from your property. Get your landscaper to make sure the ground around your basement slopes away from the foundations.

Frequently Asked Questions

Is mold in basement dangerous?

Yes. Your home’s structural integrity can be jeopardized if mold is allowed to fester within the walls. When inhaled or touched, it can cause allergic reactions and other health issues.

Can mold grow on concrete basement walls?

Yes. To thrive, mold requires oxygen, water, and a source of food to thrive. A dark, damp basement is a perfect breeding ground for mold to thrive. Mold may grow in the tiniest crack in a concrete slab, no matter how dry it is.

How expensive is basement mold removal?

Costs can vary widely. Depending on the severity of the infestation, the cost might range from a few dollars to several thousand dollars. Get a free estimate from All Dry USA right away.


To remove mold from a basement wall, there are a number of options. However, if the mold damage is serious, we recommend that you contact a specialist.

Helen Skeates

Helen Skeates

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