Can Moldy Brick Walls Be Cleaned, or Must It Be Replaced?

Cleaning mold from brick walls is often effective when the mold is surface-level and the brick itself is sound. The pros use specialized cleaning solutions and techniques, such as pressure washing with low pressure to avoid driving water deeper, or applying a biocide to kill mold spores. After cleaning, they dry the wall thoroughly to prevent regrowth.

If the mold is only on the surface and the mortar is intact, cleaning can restore the wall's appearance and remove the health concern. The key is to address the moisture source first, such as a leak or poor drainage, or the mold will return. You may need to seal the brick after cleaning to protect it, but only after it is completely dry.

Start by identifying and fixing the moisture source, whether it's a leaky gutter, a sprinkler hitting the wall, or poor grading. Then, protect yourself with gloves, goggles, and a mask to avoid inhaling mold spores. For small areas, you can use a mixture of water and a mild detergent, but for larger infestations, the pros have the right equipment and biocides.

Apply the cleaning solution to the affected area and scrub gently with a stiff brush, avoiding excessive water that can soak into the wall. Rinse with clean water and allow the wall to dry completely, which may take several days. After drying, check for any remaining stains or mold, and repeat if needed. Consider applying a breathable sealant to help prevent future moisture intrusion.

• Fix the moisture source first before cleaning.
• Wear protective gear, including a mask and gloves.
• Use a low-pressure rinse to avoid forcing water into brick.
• Allow the wall to dry thoroughly for several days.
• Apply a breathable sealant after cleaning and drying.

If the mold covers a large area, if you have health concerns like allergies or asthma, or if you suspect the mold has spread behind the wall, it's time to call local water damage pros. They have the equipment to dry the wall and the knowledge to choose the right treatments. They can also assess if replacement is needed.

You might also want a water damage inspection to identify hidden moisture and mold growth. The pros can use moisture meters to find damp spots that aren't visible. If you have insurance, check your policy to see if mold damage is covered. Policies vary, and your insurer decides what is covered. Always act quickly to prevent further damage.

• Large mold patches or recurring growth.
• Health symptoms like coughing or sneezing.
• Visible water stains or dampness on the wall.
• Mold inside the home or in a crawlspace.
• Suspected structural damage behind the brick.