How to Get Rid of Mold on Concrete Block Walls – Step by Step Guide

Your beautiful house won’t stay the same if you find mold on your concrete walls.

Molds do not only give an unpleasant look to your home but also is hazardous to health.

For every house owners, it is crucial to know how to get rid of mold on concrete block walls.

To get rid off mold, you will need some necessary tools, but the process can be quite time-consuming.

We are here to guide you through which you will be able to get rid off the unwanted mold – whether it’s in your kitchen, living room, or basement.

At first, you should have some basic knowledge about molds and why they occur. Knowing this will help you to prevent black molds from happening again.

Mold can grow quickly with the presence of food and moisture.

You might think about how a concrete block wall can provide food. It is not possible to clean the walls every day.

Get Rid of Mold on Concrete Block Walls

As a result, it makes a thin layer of dust, which is an excellent source of nutrients. In case of moisture, mold occurs quickly as cement blocks easily absorb water.

The moisture barriers don’t work all the time properly. In winter, mold grows more because of the moisture.

Also, mold doesn’t need any specific temperature to grow; they only need enough moisture and nutrients.

Below, we suggested a step by step guide for you. It will help you to get rid of the unwanted mold on the walls of your house.

Steps to Remove Mold on Concrete Block Walls

Step 1: Collect the necessary tools and materials

You will need a few essential tools and ingredients to get rid of black mold. You will need water, bleach, scrub brush, sponge, disposable towel, etc.

Step 2: Take safety precautions

Mold is a chemical substance which contains harmful components. You should be careful while working because it might affect your health.

Never use your bare hands to get rid of the molds. Before starting to work, wear a full-sleeved t-shirt and long pants.

Make sure to cover your body well. Use gloves as well. To protect your eyes, wear goggles.

If you have asthma, you should always wear a breathing mask or respirator before doing these kinds of works.

Step 3: Identify molds

You can be confused while identifying molds in your concrete walls. Because molds and minerals are quite similar, and they are hard to differentiate with bare eyes.

Usually, molds look like dark and hairy looking substances. To be clear, take a spray bottle and fill water in it.

Then spray on the areas. If the elements get mixed and dissolve, they are minerals.

But if nothing happens, it is black mold. Mark those areas and go into the next step.

Step 4: Scrub the mold with a mixture of water and bleach

You must need an answer to a question, what kills mold? We all use bleach to kill bacteria and remove dirt.

Will bleach help in killing mold? Bleach is the ultimate solution to remove mold. But only bleach might not be enough.

Take the right amount of bleach and mix it with water. Then take a scrub brush to scrub the mold.

Dip the scrub brush in the mold and clean the concrete wall properly. After the molds are gone, you must rinse the area with clean water.

You can also use detergent instead of bleach.

Step 5: Let the walls dry

After you are done cleaning, let the walls dry. Take a disposable towel and dry the area by patting the towel on the wall.

Remember, molds grow in the presence of moisture. So it is crucial to make the walls dry.

Otherwise, you will find mold growth again in a few days. If the area doesn’t get enough ventilation or air, take a fan and point it towards the wall.

Step 6: Prevent mold from growing again

It is not possible to clean the walls every day. To prevent molds from growing back, you can buy products like mold repellent spray or mold repellent paint.

These products will help you to avoid the regrowth of molds.

You may also be interested in: How to Fill Depressions in Asphalt Driveway – 5 Easy Steps to Follow

How to Get Rid of Mold on Concrete Block Walls

How Can I Remove Mold on Basement Walls Cinder Block?

The basement is the perfect place for mold growth. Because basements usually don’t have proper ventilation.

They quickly absorb moisture as they are typically made with cinder blocks.  And there is the presence of many organic materials.

All these make it easier for mold to grow efficiently and quickly on basement walls and floors. You might find different types of mold in your basement.

But the important part is how to remove them. The process is similar to before with few modifications.

This process needs extra care because the molds in the basements are more intense, and they can reoccur very quickly.

Step 1: Remove everything before working

You must remove everything from your basement before you start to work.

Step 2: Clean the basement wall

Before applying bleach or detergent, you need to clean the basement walls. Take a bar of soap and mix it with water.

Pour the mixture in a spray bottle. With the help of a sponge, wipe the walls and take off the extra dirt from the wall.

It is a necessary step because cleaning the excess trash will be a hassle while you remove the molds.

Step 3: Make a solution of water and detergent

You can use detergent to get rid of the black mold on the wall. You can also use bleach, hydrogen peroxide, or bleach.

Never use these elements without mixing them with water. Take a bucket with warm water and mix a cup of bleach with it.

Commercial bleach includes toxic materials, so never use your bare hands to mix the solution.

Step 4: Take a hard, bristle brush and scrub the basement walls

If there are several layers of mold, it will take a long time to get rid of them. But don’t lose hope.

You will need some extra time, but the mixture of the bleach and water will remove the molds eventually.

The final step is similar to before. You will need to wash the area with clean water and let the walls dry.

There are several other places where mold can grow. You may see black molds on woods, in your shower, basement, bathroom, or even carpet.

You may try using the methods mentioned above. I hope they will work well for you 🙂


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