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Spalling or Flaking Brick Veneer
in Nashville, TN
Spalling brick is brick that's literally falling apart on the face — the outer layer pops off in flat chips or chunks. This happens because water soaks into the brick and freezes. Nashville gets roughly 30 or more days per year where temperatures cross the freezing mark, and that's enough to drive spalling in older or softer brick. Once the face is gone, the exposed material soaks up water even faster.
Quick Answer
Spalling is when the face of a brick pops or flakes off, leaving a rough, pitted surface. It happens when water soaks into the brick, freezes, and blows the outer layer apart. Nashville's winters are mild enough that people ignore them, but we still get enough freeze-thaw cycles every year to do real damage. Once brick starts spalling, it soaks up water even faster, so the problem speeds up on its own. Have it looked at before you lose more brick.
Telltale Signs
Warning Signs to Watch For
- Flat chips or chunks of brick material on the ground at the base of a wall
- Rough, cratered, or pitted faces on individual bricks while the rest look normal
- Red brick dust or powder at the base of the wall after a freeze
- Bricks that look darker or stay wet longer than the ones around them
- Entire sections of wall where the brick face looks patchy or eaten away
Root Causes
What Causes Spalling or Flaking Brick Veneer?
Soft Brick Absorbing Too Much Water
Older homes in areas like Edgehill and Waverly-Belmont have brick that was made before modern firing standards. That older, softer brick is highly porous — it soaks up water quickly. When Nashville temperatures drop below freezing, that trapped water expands and the brick face pops off.
The Fix
Selective Brick Replacement and Sealing
Damaged bricks are removed and replaced with compatible new brick, and the wall is sealed with a breathable masonry sealer that slows water absorption without trapping moisture inside.
Wrong Mortar Mix Used on Repair
When someone uses a modern high-strength mortar to repoint old soft brick, the mortar becomes harder than the brick itself. Water and movement that used to be absorbed by the mortar now get pushed into the brick face. The brick cracks and spalls while the mortar joint next to it looks fine.
The Fix
Soft Mortar Repointing
The hard modern mortar is ground out carefully without damaging the brick, and it's replaced with a lime-based mortar that matches the flexibility of the original wall materials.
Gutter Overflow Soaking the Wall
Nashville gets intense rain events, especially in spring. When gutters are clogged or undersized, water pours over the edge and runs straight down the brick wall below. That section of brick stays wet far longer than the rest and goes through far more freeze-thaw cycles every winter.
The Fix
Gutter Repair and Damaged Brick Replacement
The gutter is fixed so water stops hitting the wall, and the spalled bricks in the affected section are replaced before the underlying wall gets more water damage.
Self-Diagnosis
Which Cause Applies to You?
Check the signs you're observing to narrow down the likely root cause before your inspection.
| What You're Seeing | Soft Brick Absorbing Too Much Water | Wrong Mortar Mix Used on Repair | Gutter Overflow Soaking the Wall |
|---|---|---|---|
| Spalling concentrated in one vertical strip below a gutter | |||
| Spalling spread evenly across an entire old wall | |||
| Brick face popping off right next to mortar joints that look new | |||
| Red powder or chips at the base of the wall after a hard freeze | |||
| Brick repairs done in the last 10 years are now spalling |
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