How to Remove Mold from Brick Surfaces

Mold needs something organic, like dirt, leather, cardboard, or food in order to grow. It takes a lot of moisture for some types of mold to grow where others need very little. There are tens of thousands of molds that have been discovered. Not all of them are toxic but some can produce lethal allergic reactions. This is especially true if you have a weakened immune systems or have other compromising health factors. Some molds are just plain molds. There are mold spores in the air we breathe and mold in some of the foods we eat.  Mold is a part of life as we know it but at the same time mold on your brick surfaces can be very unsettling and unsightly.


How to begin

To remove mold, it is not always easy. Safety is key; you will want to wear goggles that do not allow air in for ventilation and rubber gloves to prevent the mold from getting on your skin. Black mold, dark green mold, and virtually every other type of mold is able to grow on brick surfaces. Brick patios, which will have a thin layer of dirt on them even if it cannot be seen, are especially prone to mold growth. The mold is not actually growing on the brick but on the dirt. If there is moisture that sits on a particular part of your home, especially after rain, you may get mold growing on the actual brick on your home.

Moss is growing on this crown and down into the brick below it. It can be removed by the ChimneyRx Safer Brick and Masonry Cleaner.
Moss is growing on this crown and down into the brick below it. It can be removed by the ChimneyRx Safer Brick and Masonry Cleaner.

Recommended Cleaner

One cleaner I recommend for cleaning brick in general whether you have dirt stains, rust, mold, or mildew is the ChimneyRx Safer Brick and Masonry Cleaner. Muriatic acid was once recommended for cleaning brick but that can bleach the brick and stain it in other ways. If you would prefer you can go to your local Home Depot or garden store and get a weed killer. You’ll want to saturate the mold and let it sit for a period of time to allow the formula to work. Scrub the area with stiff bristle brush and rinse. You may have to repeat this process many times especially if the mold is very developed. Be cautious by not getting any chemicals on your skin or in your eyes.

If all else fails…

If you have more than ten square feet of area covered in mold you may want to consider bringing in a professional who will be able to assess why the mold is growing there and help you prevent it from coming back. Mold growing inside your home, especially in your bathroom, you’ll want to care of as quickly as possible for health concerns.

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Clay Lamb
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4 thoughts on “How to Clean Mold off Brick Surfaces

  1. Right! Mold on bricks is really unsightly that’s why I spend time cleaning them. But I dont recommend using muriatic acid because it has a bad smell. I just immediately scrub once I noticed mold on bricks so it could easily be removed.

  2. We have a strange orange clumpy looking substance on one area of the indoor brick around the gas fireplace. Anyone know what it is?

  3. Sorry for the belated response, been out of the office for a few weeks.

    Addressing the orange “substance,” it sounds like it might have been creosote left in the chimney that has been heated and dripped back down. This will often have a orange tint to it. It might also be carbon buildup from misfiring of the fireplace.

    Unfortunately, without seeing it in person it is difficult to determine what it is exactly. I would recommend you contact a local gas fireplace service professional to take a look at it and give an informed opinion.

    Burn safe and warm,


  4. M Tipp,

    Hi there. I am just researching online and have the same question you posted back in July. I have noticed a weird orange clumpy substance growing on the white brick of my fireplace. I have no idea what it is. Did you ever find out?

    Thank you so much. I appreciate your response.


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