The short answer
What Causes Crumbling Brick
Water is the usual culprit. When moisture gets behind the brick, it can freeze and expand, cracking the surface. In a humid subtropical climate, spring hail and thunderstorms add to the wetness. Over time, this leads to spalling, where the face of the brick flakes off.
Poor drainage is another big factor. If the soil slopes toward your foundation, or if downspouts dump water right next to the wall, the base stays wet. Sprinklers that hit the brick also add moisture. Salt deposits, called efflorescence, can appear as white powder, a sign of water moving through.
- Check for standing water near the wall
- Look for white salt stains on the brick
- Inspect gutters and downspouts for leaks
- Feel the brick for dampness after rain
- Notice if the mortar is soft or crumbly
How to Check for Water Damage
Start with a simple visual inspection. Walk around your home and look for cracks, missing mortar, or bricks that have popped out. Pay special attention to the bottom few feet, where moisture is most likely to sit. Use a flashlight to see into small gaps.
Touch the brick after a rain. If it feels damp or cool, that's a sign of moisture. You can also do a simple test: tape a plastic sheet over a small area for a day. If condensation forms underneath, water is coming through. For a deeper look, consider a moisture mapping service to find hidden wet spots.
- Use a flashlight to spot hairline cracks
- Press a screwdriver gently into mortar to test hardness
- Check for gaps between brick and window frames
- Look for green algae or moss, which thrive on dampness
- Monitor the wall after heavy rain for damp patches
Fix the Moisture Source First
Before repairing the brick, stop the water. Improve drainage by extending downspouts at least a few feet away from the wall. Grade the soil so it slopes away from the foundation. If sprinklers hit the brick, adjust the heads or install a shield.
Seal cracks in the mortar and brick with a quality masonry sealer, but only after the wall is dry. For ongoing issues, a water damage inspection can identify entry points you might miss. Keep an eye on your gutters after storms, since heavy rain can overwhelm them quickly.
Repairing Crumbling Brick
Once the moisture is controlled, you can repair the damaged brick. For small areas, remove loose pieces and replace them with new brick and mortar. Match the color and texture as closely as possible. For larger sections, you may need to rebuild the wall.
The pros often use a process called repointing, where old mortar is removed and replaced. This helps keep water out. If the brick is severely spalled, it might need replacement. Always let the area dry completely before applying any sealer. The cost depends on the extent of damage and the type of brick.
When to Call the Pros
If the crumbling is widespread, or if you notice cracks in the foundation itself, get professional help. Water damage can weaken the structure over time. A structural drying and dehumidification service can remove moisture from the walls and air, preventing further damage.
Local water damage pros can assess the situation and recommend the right steps. They might use moisture mapping to find all wet areas. If the problem is from a leak, leak detection services can locate the source. Acting quickly is key to saving your brick siding.
Policies vary, and your insurer decides what is covered.
- Cracks wider than a quarter inch
- Bricks that are soft or crumbling to the touch
- Signs of mold or mildew on the interior wall
- Water stains on the ceiling or floor near the wall
- A musty smell in the basement or crawlspace
Talk to someone now
Phones are answered 24/7 for Rockwall and nearby communities.
Call Now (469) 698-4610Frequently asked questions
Can I paint over crumbling brick to stop it?
Painting over spalling brick won't fix the underlying moisture problem. In fact, paint can trap water inside, making the damage worse. You need to address the water source first, then repair the brick. Only after the wall is dry and repaired should you consider a breathable masonry paint.
Is crumbling brick a sign of foundation problems?
Sometimes. If the brick is crumbling because the foundation is shifting, you might also see cracks in the mortar and uneven floors. But water damage is the more common cause. Have a water damage inspection to rule out moisture issues before assuming a structural problem.
How long does brick repair take?
The repair time depends on the extent of the damage. Small patches might take a day, while larger sections could take several days. Drying time is also a factor, since the area needs to be dry before sealing. The pros can give you a better idea after inspecting the wall.