Asked by: Ling O'Connor
home and garden indoor environmental quality

Can mold grow on concrete basement walls?

Last Updated: 18th February, 2020

Mold is a type of fungus that tends to grow in areas with a lot of moisture. It tends to grow on organic matter such as wood or textiles, but it can also grow on concrete or cinder block walls. Clean it as soon as possible to help prevent its negative effects. Cinder blocks are porous and hold mold growth easily.

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Beside this, how do you remove mold from concrete basement walls?

Scrub the surface mold stains from walls and wood trim with a mixture of 1 qt. water and 1/2 cup bleach mold cleaner to kill the mold. Use a soft brush and work until signs of the mold disappear. After scrubbing the surfaces, simply allow the bleach solution to continue to penetrate the surfaces and dry.

Likewise, is mold on concrete dangerous? Dangers. Mold spores can cause many types of health risks, especially to those susceptible to allergies and respiratory problems (such as asthma), and they can cause inflammatory rashes, headaches, and other flu-like symptoms. So whenever you're around concrete mold, make sure to take the proper precautions.

Furthermore, can mold grow on concrete walls?

Mold growth on a concrete wall due to excess humidity. On it's own, concrete does not provide a sufficient food source for fungal growth. Therefore, unless the concrete is kept extremely clean, mold growth can occur. Of course, even if the concrete is covered in dust, mold will not grow without sufficient moisture.

Will a dehumidifier kill mold?

So, to answer your question, dehumidifiers do NOT kill mold, but they do prevent it by reducing humidity. If you have a mold problem in your home, don't wait. Mold spreads as long as it has a water source.

Related Question Answers

Maryluz Irnan


What can I spray in basement for mold?

Fill a clean spray bottle with white vinegar. Spray all areas--such as basement walls, shelves, and other hard surfaces--that have mold liberally with the vinegar. Vinegar will kill the mold while deodorizing the area.

Modibo Sirvent


Does bleach kill black mold?

Killing Black Mold with Bleach on a hard, non-porous surface will kill nearly any type of mold spore(s) that it comes in contact with. Eliminating Black Mold with Bleach is also very inexpensive and readily available.

Carrasca Llantada


Can you Drylok over mold?

DO NOT PAINT YOUR WALLS, even with Drylok or waterproofing paint. Concrete does not support fungal (mold) growth.

Nahim Ratke


Can you paint over mold?

Mold is unsightly, and remediation can be expensive and take up a lot of time. But painting over mold is a bad idea for many reasons. Paint does not kill mold, and it will not stop the source of the mold. Mold will continue to grow under the paint, and you will see visible signs of mold again.

Genoveva Wachsmuth


How do you treat mold in a basement?

To clean it yourself, apply a mold-killing cleaning agent such as diluted bleach, undiluted vinegar, or 3% hydrogen peroxide. Let the solution sit briefly, then scrub and rinse the area. Eliminate any leaks, condensation and excess humidity, since reducing moisture is the most important way to combat basement mold.

Susanna Greer


Can mold in basement affect upstairs?

If I have mold in my basement will it affect my upstairs? I don't have a central heat and air system. Yes, in most scenarios mold issues in the lower portion of a home will affect the areas above it. This is due to the “stack affect” which is the principle of air rising inside of a home.

Anisha Marquerink


What is the difference between mold and mildew?

Mildew is typically white, gray or yellow and grows on the surface of moist, warm areas. Its texture is fluffy or powdery. On the other hand, mold tends to be green or black, and it usually grows underneath the surface of anything that has gotten wet. Its texture can be fuzzy or slimy.

Ynes Loy


How dangerous is mold in walls?

Mold itself is not dangerous or toxic, although there are some types of mold that produce toxic mycotoxins, such as black mold. For most people, however, it is the mold allergy or sensitivity that leads to uncomfortable symptoms. Fortunately, these go away once the mold is removed.

Claudia Jardon


How do you stop mold on concrete?

Here's how to to keep mold away from your home:
  1. You'll need:
  2. Remove the mold:
  3. Step 1: Put on old or already-stained clothing and rubber gloves.
  4. Step 2: Add 1 part bleach to 4 parts water and mix thoroughly.
  5. Step 3: Dip your brush into the cleaner and scrub the moldy surfaces thoroughly.
  6. Step 4: Let the area dry.

Delila Bestuzhev-Ryumin


How do you prevent mold on concrete walls?

As a homeowner, you will need to take aggressive steps to prevent mold from growing on your concrete basement walls.
  1. Paint the Walls. One of the first thing that you should do is paint the walls with a mold-resistant paint.
  2. Eliminate Moisture. Moisture is necessary for mold to grow.
  3. Use Light.

Stancu Schunmann


Is black mold in my basement dangerous?

The Dangers of Black Mold in Basements. Any type of mold in a home can cause serious health issues in those who are at risk but one of the most dangerous types is Stachybotrys chartarum. A basement is also often more neglected than other parts of the house, therefore allowing the mold a longer period to grow undetected

Andras Holzenkampfer


Does black mold smell?

Signs of Black Mold
A musty, earthy smell, like dirt and rotting leaves, is a telltale sign of mold's presence. Stachybotrys smells especially strong. The smell almost guarantees mold. But even if you see mold, that's no guarantee that it's black mold.

Housnia Zemouri


Does bleach kill mold on concrete?

The best solution is to scrub and clean the affected areas with a mold-killing detergent or a simple solution of household bleach and water. Be sure to scrub aggressively to get down into the pores of the concrete. Let the detergent or bleach solution soak in for a while to ensure that all the mold is killed.

Mrabih Arrimar


How can you detect mold?

Look for Outside Leaks
If mold is growing on an exterior wall or ceiling, first look for a leak in the wall or roof as a test for mold. Measure from the moldy area to a reference point like a door, then find the spot on the other side of the wall or ceiling.

Mahdia Hopner


How can you kill mold?

To kill mold: Use white distilled vinegar and pour it into a spray bottle without watering it down. Spray the vinegar onto the moldy surface and leave it to sit for an hour. Finally, wipe the area clean with water and allow the surface to dry.

Badri Wohrl


What does mold smell like?

Mold does not always have a strong smell but when it is present, it's often described as musty. Others have described mold smelling earthy, meaty or resembling the odor of wet socks or rotten wood. For many homeowners, the smell is unpleasant and pungent.

Sinziana Holzner


Which is better to kill mold vinegar or bleach?

Bleach and vinegar can both kill mold, but vinegar is much more effective for removing mold from porous materials. This is because bleach only kills mold spores on the surface of affected materials. If you use bleach to remove mold growth, there is a good chance that the mold will return.

Rodovica Kranzl


Sohail Elliston


What kills black mold on concrete?

  1. Place a hose on its most powerful setting to clean off the concrete.
  2. Scrape off any remaining black mold with a spatula.
  3. Mix a solution of chlorine bleach, detergent and water.
  4. Apply the solution to the concrete with sponge or brush.
  5. Rinse off the concrete.
  6. Scrub the concrete and rinse again if black mold persists.