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Efflorescence on Brick
in Nashville, TN
Efflorescence is the white powdery residue that shows up on brick walls when water carries dissolved salts to the surface. Nashville gets heavy rain in spring — some years over 60 inches total — and that water pushes through brick constantly. The stain itself won't collapse your wall, but it's telling you water is moving through places it shouldn't be.
Quick Answer
Efflorescence is the white powdery or crusty stuff you see on brick walls. It happens when water moves through the brick, picks up salts from inside the wall, and leaves them on the surface when the water evaporates. In Nashville, wet winters and heavy spring rains keep that water moving. A mason can clean it off and seal the source, but cleaning alone won't fix it if water is still getting in.
Telltale Signs
Warning Signs to Watch For
- White, chalky, or crusty deposits on the face of brick or block
- Staining that gets worse after rain and fades in dry weather
- A fuzzy white bloom spreading across large sections of a wall
- Brick faces that look damp or darker than normal even days after rain
- White streaks running down from mortar joints or windowsills
Root Causes
What Causes Efflorescence on Brick?
Deteriorated Mortar Joints
Mortar joints in homes built before 1980 in neighborhoods like Sylvan Park and Bellevue are often soft, crumbling, or missing in spots. Rain hits the wall and finds those gaps immediately. Water soaks into the brick and block behind the joint, pulls salts out of the material, and deposits them on the surface as it dries.
The Fix
Tuckpointing and Joint Repointing
Old or crumbling mortar is ground out to a consistent depth and packed with fresh mortar matched to the original mix. New tight joints stop the water from entering at that spot.
No Cap or Flashing at Top of Wall
Flashing is a thin metal strip installed at the top of a wall or above windows to direct water away. Many older Nashville homes were built without it, or the original flashing has corroded away. Rain hits the top of the wall, runs straight down inside the brick cavity, and carries salts to the face of the wall as it exits.
The Fix
Flashing and Coping Installation
A mason installs new metal flashing at the top of the wall and seals it properly. This blocks the entry point where most of the water was getting in.
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 | Deteriorated Mortar Joints | No Cap or Flashing at Top of Wall |
|---|---|---|
| Staining concentrated around mortar joints | ||
| White streaks running down from the top of the wall | ||
| Staining appears across the whole wall face evenly | ||
| Staining started after a new roof or gutter was installed | ||
| Mortar crumbles out when you press it with a finger |
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