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Can I Power Wash Mold off My Exterior Brick?

Last updated October 31, 2026

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The short answer

Why Power Washing Can Backfire

Power washing might remove surface mold, but the force can push water into tiny cracks and pores in the brick. That trapped moisture can feed mold growth from the inside out. Over time, it may also erode the mortar joints, leading to loose bricks and more water intrusion.

For brick that is already porous or weathered, the risk is higher. In a humid climate with cold snowy winters, the freeze-thaw cycle can make any trapped water worse. A gentler approach is often safer for your brick's long-term health.

Start with a Gentle Clean

Before reaching for a pressure washer, try a simple solution. Mix a mild detergent with water and use a soft-bristled brush to scrub the moldy areas. Rinse with a garden hose at low pressure. This removes surface mold without forcing water into the brick.

For stubborn spots, you can use a commercial mold cleaner designed for masonry. Always test it on a small, hidden area first. If the mold covers a large surface or keeps coming back, that's a sign of a deeper moisture problem that needs a professional eye.

  • Use a soft brush and mild detergent first
  • Rinse with low pressure, not a jet
  • Test any cleaner on a small area
  • Avoid cleaning on windy or rainy days
  • Let the brick dry completely after cleaning
  • Wear gloves and eye protection

When to Call the Pros

If mold keeps returning after cleaning, or if you see it on large sections of the wall, it's time to call local water damage pros. They can inspect the brick and the surrounding structure to find the source of the moisture. The fix might be a leaky gutter, a cracked sill, or poor drainage.

The pros have tools to measure moisture levels inside the wall. They can also dry out the structure if water has already seeped deep into the brick. This is not something a homeowner can easily do on their own, especially when mold has spread behind the surface.

Moisture Mapping and Inspection

Power washing might clean the surface, but it doesn't solve the underlying moisture problem. A water damage inspection can identify where water is entering and how much moisture is trapped. Moisture mapping uses sensors to create a picture of wet and dry areas in the wall.

This kind of assessment helps you understand whether the mold is a one-time issue or a sign of ongoing water intrusion. With that information, you can decide on repairs, like fixing gutters or resealing brick. Skipping this step often means the mold will return.

  • Inspection finds the source of moisture
  • Moisture mapping shows hidden wet spots
  • Helps decide if repairs are needed
  • Prevents mold from coming back
  • Gives you a clear picture of the problem

Prevent Mold from Returning

After cleaning, focus on keeping the brick dry. Trim back trees and shrubs that block sunlight and airflow. Make sure downspouts direct water away from the foundation. Check for cracks in the mortar and seal them promptly with a masonry caulk.

After heavy rain or snowmelt, keep an eye on the brick for any new mold growth. Mold thrives in damp, shaded spots. Regular cleaning and quick fixes to drainage can stop mold before it becomes a bigger problem. If the issue persists, the pros can help with structural drying.

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Frequently asked questions

Will power washing damage my brick?

Yes, high pressure can erode mortar and push water into the brick, causing long-term damage. If you do power wash, use a wide nozzle and low pressure, and keep the stream at an angle. A gentler cleaning method is usually safer.

What is the right way to remove mold from brick?

The right method depends on how much mold you have. For small areas, a soft brush and mild detergent work well. For large or recurring mold, call the pros to find and fix the moisture source, not just clean the surface.

Can mold on brick affect my health?

Mold can cause respiratory issues, especially for people with allergies or asthma. If you feel unwell after cleaning or being near the mold, see a doctor. Wear a mask and gloves when cleaning to reduce exposure.

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