Heaving Heaving is the upward movement of concrete caused by forces beneath the pavement. It can raise slabs above their original elevation and create uneven walking surfaces.
Sidewalk heaving may result from expanding soil, growing tree roots, or seasonal frost action. As the slab lifts, adjoining pavement sections often become misaligned, increasing the risk of trips and falls. Repairing heaved concrete typically requires identifying and correcting the source of the upward movement.
Frequently Asked Questions About Heaving
What is sidewalk heaving?
Upward movement of concrete caused by forces beneath the pavement, lifting slabs above their original elevation.
What causes heaving?
Growing tree roots, expansive soil and seasonal frost action are the most common causes in New York.
How does frost heave work?
Water in the soil freezes and expands, pushing the slab upward. Repeated cycles can leave the flag permanently displaced.
How is heaved concrete repaired?
By identifying and correcting the source of the upward movement first, such as root management or improved drainage, then replacing the affected flags.