How To Remove Mold From Concrete Patio? Step-By-Step Guide

Helen Skeates
Helen Skeates
19 min read

Concrete is an excellent material for patios, driveways, pathways, and basement walls and flooring because of its light color and unmatched durability. Despite its strength, concrete’s porous nature renders it prone to mold growth, which thrives in the moisture trapped in these small crevices.

After establishing a foothold, it will quickly grow and spread, leaving behind ugly black or green splotches that could pose a major health risk.

For the sake of your home’s beauty and safety, it’s important to know how to remove mold from concrete. Using a bleach solution, laundry detergent, and water, scrub the afflicted area, then rinse it clean with a sponge or power washer is the easiest approach to remove mold from concrete.

It is the purpose of this article to look at what causes concrete to develop mold, what the best methods are for removing mold from concrete, and how to prevent the mold from returning.

Can Mold Grow on Concrete?

Mold can grow on concrete, it’s true. On driveways, patios, and steps that become wet but take a long time to dry because they don’t get a lot of direct sunlight, this is a common occurrence.

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North-facing walls, concrete in shady regions, and patio floors are all included in this category. Mold and mildew thrive in environments that are dark and moist.

Mold can grow indoors due to dampness, leaking pipes, or rainfall that seeps through a foundation, among other things.

The porous nature of concrete makes it ideal for the growth of mold. Concrete mold growth is more common in locations with hot, humid conditions.

Splotches of black or green mold on concrete are usual when it occurs. Water evaporating into the porous surface of the concrete, which in turn leaves behind any salt that was in it, can produce efflorescence, a salt build-up on concrete that is sometimes mistaken for mold because of its white color.

Is Mold on Concrete Dangerous?

An ugly mold problem on the outside of a house may not be as deadly as mold growing on inside concrete surfaces. If you find black mold in your home, you need to get rid of it as quickly as possible since it can be harmful to your health.

The eyes, nose, and throat might be irritated by black mold, which can exacerbate allergies and asthma attacks. Additionally, if left uncontrolled, it can also cause severe property damage, especially when it goes beyond concrete to the wood constructions.

Make sure you’re using proper safety gear when eliminating mold from an interior environment. Professional mold mitigation services are required when extensive mold problems are discovered inside.

What causes black mold on concrete?

For a variety of reasons, mold can thrive on concrete. Black mold, like other varieties of mold, thrives in the appropriate conditions. Black mold can grow on damp surfaces, such as those left behind by dripping faucets or leaking pipes and water tanks. Through wind, animals, or water, the spores of black mold can spread from one location to another. When black mold grows on a moist concrete surface, it will thrive. A little patch of black mold can quickly grow out of control due to its rapid reproduction. This means that within a short period of time, your concrete will be covered in black mold.

In a basement, black mold may have developed as a result of a leak from the exterior or poor plumbing. Mold can form on surfaces in homes with a high level of humidity. Mildew can form on outdoor concrete, such a patio, if it doesn’t entirely dry after being damp. Concrete that is well-shaded tends to look like this.

Signs Of Mold

It’s well-known that mold thrives in wet and humid conditions. This rule applies to patios as well. When the conditions are right, you can see and smell the slightly hairy look and musty odor of this plant’s growth.

You can tell it apart from the rest because of its circular shape. A variety of hues are also available, however black ones have been linked to toxicity. You may learn more about identifying black mold by reading this article.

Try reading up on the different varieties of mold if you’re a novice in this area of home maintenance. To avoid spending your time, effort, and cleaning products on a minor spot, you can use this method.

Step 1 – Clean First

Before attempting to eliminate the mold, you’ll want to thoroughly clean your patio. To begin, use a vacuum cleaner to remove any caked-on dust, and then a mini-vac or feather duster to get into any cracks or hard-to-reach locations. Instead of using a vacuum cleaner, consider using a wet/dry vac, which is designed for use on concrete surfaces.

Make a homemade cleaning solution of mild liquid soap and warm water after removing the dust from your patio. Apply it to the patio and let it sit for a few minutes before using a hard-bristled scrub brush to give it a thorough cleaning. Use a wire brush instead if you run into any really difficult stains. After cleaning, use a garden hose to remove any leftover cleaning solution.

Step 2 – Apply Your Bleach Solution

Cleaning the patio of dirt, dust, and debris is the first step in removing the mold. The first thing you should do is make a solution of 1 cup bleach to 1 gallon warm water in a new bucket.

You should wear a paper breathing mask and rubber gloves when dealing with bleach to protect yourself from the strong fumes and skin irritation that might result. Make sure to take a break far away from your work area in fresh air if you begin to feel dizzy or weak from the fumes at any stage during the process.

Then, using a scrub brush, vigorously scrub the mold deposits after applying your bleach solution and letting it sit for 10 to 15 minutes. You may need to use the wire brush again if it’s still stubborn.

Step 3 – Apply Your Finishing Touches

The bleach solution should be rinsed off with a garden hose after you have removed all of the mold. You’ll need to use a clean cloth or paper towels to dry the surface as much as possible once it has been thoroughly cleaned. To avoid mold growth, make sure you do this step as thoroughly as possible to remove any excess moisture. Additionally, a wet/dry vacuum can be utilized to quickly and easily remove any remaining moisture.

Step #4. Dry the surface

Drying the surface is a no-brainer, of course. Any trace of moisture, on the other hand, is a possible breeding ground for mold and should be totally removed.

As you dry the area, use a clean cloth or paper towel. To remove any remaining moisture as quickly as possible, another option is to use a wet/dry/vac.

Despite the fact that the region is outside, this duty cannot be left to the rays of the sun alone. Leaving a wet cleaning area opens it up to dirt and grime, but it also creates a slippery surface, increasing the risk of an accident.

Pin on patio planning

How to Remove Mold From Concrete Patio

When it comes to removing mold from an outdoor surface, the possibilities are much more varied than when it comes to removing mold from an indoor environment. A pressure washer with a PSI range of 100 to 200 PSI and a concentrated mold-killing solution is the best way to clean a concrete patio.

A pressure washer can be used to clean a vast area in a short period of time.

Using a low-pressure nozzle, apply the concentrated solution to the pressure washer’s tank. Avoid spraying high-pressure water directly at your home’s foundation by brushing cleaner across your patio in a circular motion.

After the cleaner is applied:

  1. For up to 10 minutes, let it soak into the concrete.
  2. Any locations with a lot of mold should be scrubbed.
  3. Make sure the cleaner isn’t allowed to dry, as this could cause the concrete to be stained.
  4. Rinse the cleaner with a rinsing nozzle attached to the pressure washer.

Use a hose and sprayer attachment if you don’t have access to a power washer. Because the pressure from the hose is insufficient to eliminate all of the mold, you’ll need to use a vinegar or bleach solution and scrub with a brush before rinsing.

Safety Considerations

The best way to protect oneself when dealing with black mold is to take all necessary safeguards.

Choose the correct size disposable gloves made of either latex, vinyl, or nitrile to prevent spores from getting inside of them. To avoid spreading mold spores, be sure to remove and discard the gloves when you’re done working on them.

Mold spores can enter your eyes if you don’t wear goggles. There should be no gaps around the eyes when the goggles are put on.

Use an air purifying respirator or a face mask to protect yourself from breathing in polluted air. To remove mold, N-95 masks filter out 95% of all particles, while N-99 masks remove 99% of all masks. Mold spore prevention is not included in the design of a surgical mask, hence it provides insufficient coverage.

For larger mold removal jobs, a Tyvek suit should be worn over your clothing rather than conventional clothing that protects exposed flesh. If you opt to come to work in your usual clothes, remove them as soon as you get there and wash them right away.

How Do You Prevent Mold From Growing On Concrete?

The easiest approach to prevent mold from forming on concrete is to seal it properly. By reducing the amount of moisture in a building, you can prevent mold from forming.

Prune down trees and shrubs that create dark spots on your concrete walkways and roads so they can get some sunlight.

Additionally, keep an eye out for any pavement cracks that may collect water and result in the formation of mold. A concrete repair product can be used to fill in these holes.

If this isn’t an option, consider sealing the concrete using an outdoor-grade acrylic sealant. This stops water from accessing the driveway or walkway, which eliminates the ideal conditions for mold to grow.

Fix faulty pipes that are allowing mold to grow indoors. Consider utilizing a product like Drylok to keep water out of basements that flood frequently.

Dehumidifiers are a fantastic alternative if a sump pump isn’t an option for your basement’s humidity management needs. Items like cardboard, wood, cloth furniture, and area rugs that might collect water and breed mold should be removed.

Also, be sure to inspect the area around the home’s foundation. To ensure that rainwater flows away from a home, it may be necessary to slope the land. To prevent water from entering the basement, avoid allowing leaves and other debris to build up around the foundation.

Your home’s gutters should also be checked to ensure they direct rainwater away from your property.

How to Get Rid Of Mold on Concrete Basement Walls and Floor

As a result of the substantial health risks associated with black mold, mold detected in the interior of a home is a far more serious issue. If you have serious interior mold issues, you may want to consider hiring a mold remediation company.

It is possible to fix the problem yourself if the cost of hiring a professional is prohibitive, or if the problem is minor.

Start by taking care of yourself. It is best to wear a high-quality respirator to prevent mold spores from entering the lungs. Protect your hands and eyes with rubber gloves and goggles.

Bleach solution or detergent and water solution can be made. Detergents are better at penetrating porous concrete surfaces than bleach, according to the EPA.

Trisodium phosphate, an industrial-grade detergent that kills mold and removes grease and grime, should be used for thorough cleaning. To get rid of mold and get to the roots, use a brush to apply the cleanser and scrub thoroughly. Cleanse with a damp cloth.

Use a vinegar or bleach solution to clean the surface and let it dry completely on the wall or floor. Preventing the mold from returning will be made easier with this method.

5 Concrete Cleaners To Sort Out Your Outdoor Space For Good

1. This Concrete Cleaner Is Good For Floors And More


Decks, driveways, sidewalks, stone, and brick can all benefit from this product’s application.

This Karcher cleaner is the most straightforward way to tackle your concrete stains. It makes 20 gallons of solution, capable of cleaning a range of outdoor surfaces. Once paired with your pressure washer, this cleaner can make your deck, driveway, stone, or brick exterior look better than ever.

2. This Concrete Cleaner Is Just As Easy To Use As The Name Suggests

This Karcher cleaner is the most straightforward way to tackle your concrete stains. It makes 20 gallons of solution, capable of cleaning a range of outdoor surfaces. Once paired with your pressure washer, this cleaner can make your deck, driveway, stone, or brick exterior look better than ever.

This Karcher cleaner is the most straightforward way to tackle your concrete stains. It makes 20 gallons of solution, capable of cleaning a range of outdoor surfaces. Once paired with your pressure washer, this cleaner can make your deck, driveway, stone, or brick exterior look better than ever.

If you have stains on your concrete, this Karcher cleaner is your best bet. 20 liters of cleaning solution can be produced, which can be used to clean a variety of outdoor surfaces.. A pressure washer and this cleanser will bring out the best in your deck, driveway, stone, or brick exteriors.

3. This Is The Perfect Concrete Cleaner If You’Re Battling Against Moss And Algae

Amount Per Bottle: 64 fluid ounces

Decks, driveways, sidewalks, and brick can all benefit from this product.

An antimicrobial cleaner can help you fight back against the formation of mold, algae, and moss in your home or business. Also, a pressure washer isn’t necessary; simply squirt water on the surface, then hose it off. It’s also a win-win situation because this remedy won’t impair the lovely appearance of your adjacent shrubbery and plants.

4. Use This Concrete Cleaner With Your Pressure Washer For Optimal Results

the equivalent of about one liter

Wood, composite, vinyl, metal, cloth, plastic, wicker, concrete, stone, brick, and asphalt can all be used.

This pressure washer solution may be used on a variety of materials, including wood, composites, vinyl, metal, cloth, plastic, wicker, and even concrete, stone, brick, and asphalt, so you can tackle all of your surfaces at once. You can use it in your backyard without worrying about harming your pets or the animals that lives there.

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5. Get Your Spring Cleaning Done Fast With This Speedy Concrete Cleaner

the equivalent of about one liter

Concrete, masonry, and plastic are all good candidates for this product.

No pressure washer is needed to get a clean finish with the use of this product – all you have to do is apply the product, then hose it off. It starts the procedure in 30 seconds flat.


How do you remove black mold from concrete patio?

HOW TO REMOVE CONCRETE FROM MOLD. Using a mold-killing detergent like RMR-86 Instant Mold & Mildew Stain Remover or household bleach and water as a cleaning agent is the best option. Scrub the concrete thoroughly to reach its pore depths.

Does vinegar kill black mold on concrete?

To kill mold on concrete, vinegar isn’t usually a good choice. Although the concrete itself is unlikely to be damaged, the surrounding cement may be affected.

What removes green mold from concrete?

Bleach, a common home cleanser, works best for removing green algae from concrete. Using vinegar and water is a common solution, but bleach is more effective since it kills algae spores faster and keeps them off the surface longer.

What kills mold better bleach or vinegar?

Vinegar is far more effective in removing mold from porous surfaces than bleach is. Mold spores are only killed by bleach when they come into contact with the material’s surface. Porous materials are no match for vinegar’s ability to permeate and kill mold at the source.

What is the black stuff on my patio?

Your backyard stonework’s patio black blotches are actually patches of black lichen. Tiny, dust-like spores that grow on the underside of leaves of trees and plants give rise to black lichen. Countless spores are blown onto your masonry by the wind and rain.


There are simple ways to get rid of this ugly and potentially deadly invader if you detect mold growing on your driveway, patio, or basement floor.

To get rid of both black and green mold, home cleansers such as laundry detergent and bleach can be used. Mold eradication can be made much easier with the use of commercial products.

Outside, power washers can swiftly remove significant amounts of mold, but indoors, devices that can remove mold while emitting low levels of fumes are best.

Regardless of the method you use, mold can be dangerous, so be sure to take the necessary safety precautions when eliminating mold.

Mold removal from concrete can be done with a power washer or a pressure washer, depending on where the mold is located and the weather conditions.

Helen Skeates

Helen Skeates

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