Undermining Undermining is the loss of soil or support beneath concrete that leaves portions of the slab unsupported. The pavement may appear intact while hidden voids develop underneath.
Undermining commonly results from erosion, leaking pipes, or repeated water infiltration beneath the pavement. Without adequate support, the slab becomes more likely to crack, settle, or rock under load. Repairs often require restoring the foundation as well as the concrete surface.
Frequently Asked Questions About Undermining
What is undermining?
Loss of soil or support beneath concrete, leaving parts of the slab unsupported while the surface may still look intact.
What causes it?
Erosion, leaking pipes, repeated water infiltration and, sometimes, disturbance from nearby excavation.
Is an undermined flag a DOT violation?
Yes. An undermined flag is one of the substantial-defect categories, even if the concrete itself is not visibly broken.
How is it detected?
Slabs that move or sound hollow under foot, soil visible at joints, and settlement patterns that follow a drainage path.
What does a proper repair involve?
Restoring and compacting the base and eliminating the water source, then replacing the concrete.