How To Remove Mold From Concrete Block Walls, Patios & Pavers

Here is all about cleaning mold from concrete blocks, pavers, and patios.

Just like your drywalls, shower, kitchen sink, and basement, your concrete patio can also attract mold growth under the right conditions.

Concrete is porous and is prone to cracks, which means it can soak up moisture and create a perfect breeding environment for mold.

Let’s not forget that your patio is covered by a shade, which means it is deprived of sun rays which can eliminate moisture and prevent mold growth.

If you find mold growing in that area and have no idea how to deal with it, then you’re reading the right article.

Here we’ll be discussing how to remove mold from the concrete patio, block walls, and pavers.

Stay with us!

Why You Should Remove Mold From Your Patio

Your patio is indeed located outdoors, and you may think mold growth in that area is not an issue. Well, it is.

Mold doesn’t look good, so allowing it to grow on your patio affects the beauty of your home. You wouldn’t want your visitors coming across such an eyesore when they make their way into your home.

Secondly, mold is a health hazard. It causes allergies and can affect those with respiratory problems. This is a problem for those who spend a lot of time hanging out on the patio.

Your children and pets can also be exposed to it too!

That’s not all, mold growth can actually compromise the structure as a whole. This won’t happen overnight, but you will notice serious deterioration in years to come.

Last but definitely not least, mold has an unpleasant smell, especially when they occur in large amounts. Why leave your front door with a musty smell?

That being said, follow the steps below for patio mold removal.

The Items You Need For Cleaning Concrete Patios

Cleaning the mold off your concrete patio would mean coming in close contact with the mold itself. For this reason, you should get the necessary gear for safety.

These include rubber gloves to guard your fingers against touching the allergenic mold, a facemask to keep particles from entering your nose and mouth, and mouth, and goggles to protect your eyes from flying pieces of mold.

Other items you will need include –

  • A cleaning solution (commercial or homemade)
  • A bucket
  • Some water
  • A hard brush

Now that you’ve got these in hand, you can start to clean.

Step One: Clear The Patio

Before you begin, make sure the patio is free of any materials or furniture that could hinder the cleaning process. This means taking out the patio chairs, benches, or carpet.

You should also do a thorough sweep or vacuum to remove dust or debris. This would create a freer surface for you to work on.

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Step two: Make your cleaning solution

There are several materials you can make your solution with. These substances can clean and kill mold all at the same time. Some can even eliminate the horrible mold odor.

One of such substances is vinegar, which you probably have in your home. Another is bleach, which is a powerful cleaning product that can remove some of the harshest stains you can think of.

Be warned though, bleach and vinegar are harmful when ingested, so proceed with caution and keep out of the reach of pets or children.

The same can be said of a commercial mold cleaner. They are extremely toxic, but effective. Also, handle with care.

Non-toxic options like lemon juice or essential oils can clean mold, but they aren’t ideal for concrete surfaces. They are better applied for tile and sink cleaning.

If you’re using a commercial mold cleaner, follow the instructions on the pack to make and apply the solution.

For bleach (which is highly recommended for its cleaning power), add a cup of bleach into a gallon of water. You can mix the materials in a bucket to get a good blend.

When the mix is ready, pour it into a spray bottle and shake once again.

Step three: Apply the solution

Using the spray bottle, visit the areas that have been affected by mold and apply the solution. You should spray adequate amounts so that the solution will seep into the concrete pores and cracks to kill the hidden mold.

Leave it to sit for about 15 to 20 minutes then proceed to the next step.

Step four: Scrub the mold away

Now it’s time to get down and dirty. Grab a hard-bristled brush and scrub the mold patches as hard as you can to dislodge the mold.

At this point, the bleach would’ve loosened up them up so it’ll be easier to get it off.

Step five: Use a high-pressure washer

High-pressure washers deliver hard blasts that can wash and leave your patio looking good as new. If you don’t have one, then you can buy from a home improvement store.

Make sure you hit all the areas where mold had previously existed, as well as other areas of your patio. Besides ensuring that all the surface mold has been dislodged, it also gives you the chance to clean the patio in its entirety.

Step six: Mop the area

Using clean water and a mop, you can wipe up your concrete patio. This would remove both the remnants of the solution and the broken-down mold particles.

After you have dried the patio, take a close look at it again to see if you missed any spot. If you did, you can apply more of the cleaning solution on the uncompleted areas then scrub again.

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Do one more inspection, and if the mold stains have been removed, you can proceed to the next step.

Step seven: Vacuum or sweep the patio

Mopping will remove most of the dislodged mold, but there will surely be some leftover particles on the ground. To remove them, simply do a thorough vacuum across the patio to suck up any bits and pieces left.

You can also use a broom to sweep the dead mold leftovers away. Although you have to control the sweep towards the direction of the dustpan. Reckless sweeping may spread the dead mold to other areas.

Remember, dead mold is also hazardous, so you’d want to get rid of them from your yard as a whole.

After the vacuum or sweep, dispose of the particles by emptying them in your outdoor trash bin and you’re done!

Your patio is now free of mold and you can enjoy hanging out there with your family, friends, and pets!

What To Do When Mold Is Lodged Too Deep Into Patio Cracks?

Cleaning surface mold from your concrete patio isn’t much of a challenge.

This is because they are visible and easy to reach. As for mold that is lodged just below the surface of the patio, you can kill them by pouring enough amounts of the solution so it can sink in and do the job.

But what about mold that is lodged too deep? Well, that’s a whole different ball game and more thorough approaches have to be employed.

It is possible that your cleaning solution will not go deep enough to kill the buried mold. This means the surviving mold can grow back on the surface over time.

In such a case, you will need to hire a mold inspector to determine the extent to which mold has penetrated the sub-surface of your concrete patio. Inevitably, the patio has to be dug and redone.

This will cost you some money, but if you’re serious about eliminating all traces of mold in that area, then it needs to be done.

How To Get Rid Of Mold On Concrete Block Walls

Cleaning mold off concrete block walls is just as easy as cleaning them off patios. Keep in mind though, concrete is porous, which means there may be mold growing inside the pores.

Follow these tips.

  • Make a bleach solution in a bucket
  • Dip your hard brush into the solution
  • Use the soaked brush to scrub the affected areas of the concrete walls
  • Rinse down with clean water
  • Repeat the process if need be

When you’re done cleaning, you would like to prevent future mold growth on your concrete block walls. You can easily do this by applying a sealer.

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The sealer not only protects the surface from moisture but also penetrates the concrete pores to prevent internal dampness and mold growth.

Ensure that the walls are 100% dry before applying the sealer. If it isn’t, then there will be some moisture trapped inside.

How To Clean Black Mold From Pavers

It is best to clean pavers when the weather is sunny. Cleaning on rainy days will not allow the pavers to dry after cleaning. Check your area’s weather forecast before you begin just to be sure.

A mixture of one part bleach and three parts of water can do the trick. Use your hard brush dipped into the solution to scrub off the mold from your pavers.

You can also use a pressure washer to blast off any black mold remnants.

Bleach is a powerful cleaning agent, which means it can discolor the pavers. Not to worry, you can always repaint with a paint sealer of your choice.

Commercial paint sealers can be found in most home improvement stores.

Once again, wait until the pavers are completely dried before applying the sealer. The natural sunlight and outdoor breeze are all it takes.

You can wait for two to three bright sunny days to ensure all the moisture has disappeared.

How To Prevent Future Mold Growth On Concrete

Now that you’ve gotten rid of the mold from concrete structures, you should take steps to prevent them from coming back.

One of the best ways to do this is by sealing the concrete with a high-quality acrylic sealer. Be sure to buy one that’s exclusively made for outdoor use.

Before applying the sealer, ensure that the concrete is 10% dry. If the surface is wet, then the sealer will not latch on and penetrate the pores effectively.

If you just had the concrete patio redone, then you should wait for at least 3 days before applying the sealer. By this time the outdoor breeze would’ve dried it up.

It is highly recommended that you use a low-solids solvent-based sealer to do the job. This will allow better breathability, especially when you consider the warm and humid exposure conditions.


Removing mold from concrete isn’t such a difficult task, especially if it’s only growing on the surface. All you need to do is follow the tips provided in this article.

If the mold is lodged very deep inside, then you can hire a professional mold remediation service to handle the job. This could demand that your concrete patio, wall, or paver be broken and redone.

As long as the mold is gotten rid of, then its mission is accomplished.

We hope this article on how to remove mold from the concrete has been helpful.

Thanks for reading!

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