Spalling Spalling is the breaking, chipping, or flaking away of the concrete surface, exposing fresh concrete underneath. It is a common form of concrete deterioration.
Spalling may develop because of freeze-thaw cycles, moisture intrusion, corrosion of reinforcing steel, or surface wear. If left untreated, the damaged area often expands as water penetrates deeper into the concrete. Repair methods vary depending on the depth and severity of the deterioration.
Frequently Asked Questions About Spalling
What is spalling?
The breaking, chipping or flaking away of the concrete surface, exposing the material underneath.
What causes concrete to spall?
Freeze-thaw cycling, de-icing salt exposure, moisture intrusion, corrosion of embedded steel and surface wear.
Does spalling get worse over time?
Yes. Once the surface opens up, water penetrates deeper and each freeze cycle removes more material.
How is spalling repaired?
It depends on depth. Shallow damage may be resurfaced in some settings, but a cited flag in NYC requires full-depth replacement rather than a surface repair.
How can spalling be prevented?
Air-entrained concrete, proper curing, avoiding heavy rock salt use, and keeping water from ponding on the surface.