How Do You Handle Water Damage to Brick Walls?
Last updated October 25, 2026
The short answer
Stop the Water and Dry the Wall
First, find and stop the water source. Check for a leaky roof, a broken pipe, or water pooling near the foundation. Turn off the main water valve if needed. In Detroit, keep your shutoff valve location written down for quick access.
Once the water stops, dry the brick slowly. Use fans and a dehumidifier to pull moisture from the porous surface. Avoid heat guns or high heat, which can cause salts to rise and leave white stains. Let the wall air out for several days before assessing the damage.
- Turn off the water source
- Move furniture away from the wall
- Set up fans to circulate air
- Use a dehumidifier to lower humidity
- Check for visible cracks or loose bricks
- Document damage with photos for your records
Clean Efflorescence and Mold
White, powdery stains on brick are efflorescence, a sign of moisture moving through the wall. Brush the surface with a stiff dry brush to remove the salts. For stubborn spots, use a mild vinegar solution and rinse with clean water.
Mold may appear as dark patches after water exposure. Wear gloves and a mask, then scrub the area with a bleach and water mix. If mold covers a large area or you feel unwell, see a doctor and consider a mold professional for safe removal.
- Dry brush away loose salts
- Use vinegar for stubborn stains
- Rinse with clean water
- Scrub mold with bleach solution
- Wear gloves and a mask
- Ventilate the area while cleaning
Assess Structural Damage
Water can weaken mortar and cause bricks to shift or crack. Tap the bricks with a hammer handle; a hollow sound may indicate loose mortar. Check for spalling, where the brick face flakes off, especially after freeze-thaw cycles.
If the wall shows deep cracks, bulging, or missing bricks, the structure may be compromised. Local water damage pros can inspect the wall and recommend repairs. They will look for hidden moisture and determine if the foundation is affected.
Repair and Waterproof
For minor damage, repoint the mortar by removing old, crumbly material and applying fresh mix. Replace any broken bricks with matching ones. After repairs, let the wall cure completely before applying any sealant.
Waterproofing helps prevent future damage. Use a breathable sealant that allows moisture to escape while blocking rain. Avoid non-breathable coatings that trap water inside the brick. Reapply sealant every few years as part of home maintenance.
Prevent Future Water Damage
Keep gutters clean and direct downspouts away from the foundation. Check for leaks in the roof and around windows. In cold climates, ensure proper drainage to avoid ice dam buildup that can send water down walls.
Inspect your brick walls yearly for cracks or signs of moisture. Address small issues early to avoid costly repairs. If you notice recurring dampness, a water damage inspection can reveal hidden problems and guide you on next steps.
- Clean gutters twice a year
- Extend downspouts at least 3 feet
- Seal cracks in mortar promptly
- Check for gaps around windows
- Maintain grading so water flows away
- Monitor for efflorescence or mold
Talk to someone now
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (313) 766-2970Frequently asked questions
Can brick walls dry out on their own after a leak?
Brick is porous and can dry, but it may take weeks. If the leak is fixed and the area is ventilated, drying can happen naturally. However, trapped moisture can cause mold or structural issues, so monitor the wall and seek help if needed.
What does efflorescence mean for my brick wall?
Efflorescence is a white, powdery salt deposit that appears when water evaporates from brick. It signals that moisture has been moving through the wall. While not harmful, it indicates a moisture problem that should be addressed to prevent long-term damage.
Should I repaint or seal brick after water damage?
Wait until the brick is completely dry before sealing. Use a breathable sealant to allow moisture to escape. Painting with non-breathable paint can trap water and cause spalling. Consult a professional for the right product for your climate.
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