The short answer
Why Mold Often Follows
When moisture remains inside a brick cavity wall, mold growth is a common next step. Mold spores are everywhere, and they only need moisture and organic material to start colonizing. Inside your wall, the wooden studs, insulation, and even dust trapped behind the bricks provide ample food for mold. The smell from active mold growth is distinct and often gets stronger in warm, humid conditions.
- Mold feeds on organic materials like wood, paper, and dust.
- It thrives in dark, damp cavities with little airflow.
- The musty smell comes from microbial volatile organic compounds (MVOCs).
- Visible mold on brick surface is rare; it's usually hidden.
- Prolonged exposure can cause respiratory irritation for some people.
- Killing mold with bleach doesn't remove the deep-seated moisture source.
Steps to Identify the Water Source
Finding where the water is coming from is your first critical task. Start by checking for obvious signs: look for efflorescence (white, powdery salt deposits) on the bricks, feel for damp spots, and inspect the wall during and after heavy rain. Check the interior side of the wall for any discoloration, peeling paint, or soft drywall, as these are telltale indicators of moisture.
Use a moisture meter on the interior drywall near the smelly area if you have one. Also, inspect your roof, gutters, and downspouts to ensure water is being directed away from your foundation. Examine the exterior mortar for cracks and the ground slope around your home. If you cannot find an obvious cause, the leak may be from a pipe within the wall, requiring more specialized detection.
How Professionals Can Help
Local water damage pros use specialized tools to find hidden moisture. They perform moisture mapping to see exactly how far the water has traveled inside the wall structure. This process involves thermal imaging cameras and deep-probe moisture meters. Their inspection can pinpoint the leak's origin and the full extent of the saturation.
Based on their findings, the pros will outline a drying plan. This typically involves creating access points to ventilate the wall cavity and using industrial dehumidifiers and air movers. Their goal is to dry the structure completely to prevent further mold growth and structural rot. They can also advise on necessary repairs to the brick, mortar, or internal plumbing.
Addressing the Damage and Odor
Once the moisture source is fixed and the structure is dry, you can tackle the lingering smell. Simply cleaning the brick surface with a mild detergent may not be enough if moisture remains inside. Odor-causing compounds and mold roots can persist in porous materials. Complete structural drying is essential to remove the odor at its source and prevent it from returning with the next humidity spike.
If framing or insulation was damaged, those materials will need to be removed and replaced. After everything is dry and clean, applying a sealant to interior surfaces may be recommended in some cases to block any residual odors. The final step is ensuring your home's ventilation is adequate to keep humidity levels in check, helping to protect your brick walls from future moisture problems.
- Extraction removes standing water from cavities if present.
- Dehumidifiers pull moisture from the air and building materials.
- Air scrubbers with HEPA filters can remove mold spores and odors.
- Damaged insulation and drywall are often removed for proper drying.
- All affected areas must reach a specific moisture content before repair.
- Policies vary, and your insurer decides what is covered.
Water damage does not wait
Call (208) 537-2633 any time, day or night, and describe what happened.
Call Now (208) 537-2633Frequently asked questions
Can I just paint over the smell?
No, painting will only trap the odor and moisture, making the problem worse. The smell will eventually seep through the new paint. You must first identify and fix the water leak, then ensure the wall structure is completely dry before considering any new paint or sealants.
Is a brick wall smell dangerous?
The smell itself is not toxic, but it signals a damp environment where mold can grow. Inhaling mold spores from such an area can cause allergic reactions, asthma attacks, or other respiratory issues for sensitive individuals. It's a health warning that should prompt you to find the moisture source.
How much does it cost to fix this?
Costs vary widely depending on the leak's source and the damage extent. Minor mortar repairs might cost a few hundred dollars, while fixing a hidden pipe leak and repairing interior walls can cost thousands. The final price depends on needed drying time, materials for repair, and labor for restoration.