Spalling is when the face of a brick flakes or pops off, and in Connecticut it is almost always caused by water that freezes inside the masonry. Left alone, spalling weakens the chimney and lets more water in.
Causes
- Water absorbed by brick and expanding as it freezes
- Failed mortar joints
- A cracked crown or missing cap
- Hard cement mortar used on soft historic brick
- Salt from coastal air
Repair Options
- Replace severely spalled bricks
- Repoint failed joints
- Repair the crown and add a cap
- Apply a vapor permeable water repellent
Prevention
Annual inspection and early repairs prevent small flaking from becoming a full rebuild.
How to Prevent Spalling
- Repair crowns and mortar early
- Use breathable sealers
- Install a cap
- Avoid hard cement repair on soft brick
Frequently Asked Questions
Can spalled brick be left alone
It will continue to deteriorate.
Is spalling covered by insurance
Typically not, as it is considered wear.
How many bricks can be replaced
Individual bricks or entire sections can be replaced.
Local Help and Related Reading
Our crews handle chimney sweeps in Danbury, chimney repair in Shelton, chimney caps in Westport and chimney cleaning in New Canaan. Browse every town on our service areas page or our services.
More to read: Fireplace Damper Problems and Replacement in Connecticut, Connecticut Holiday Fireplace Safety: Chimney Tips Before the Season, Chimney Inspection Cost in Connecticut: What to Expect.
For wider guidance, see the EPA Burn Wise program, the U.S. Department of Energy and CT DEEP.
