A slab that has sunk at one edge or heaved at a joint is a trip hazard even when the concrete itself is perfectly sound. Leveling corrects the height difference without breaking out and re-pouring the slab, which makes it quicker and less disruptive than replacement where it is suitable.
When leveling is the right approach
Leveling suits slabs that are intact but sitting at the wrong height because the ground under them has settled or been washed out. It is not suitable for slabs that are cracked through, badly spalled or too thin, since lifting a damaged slab tends to break it. We assess each slab individually and recommend leveling only where it will hold.
Leveling versus grinding
For small height differences at a joint, grinding the high edge down can remove the trip hazard quickly. For larger differences, or where the low side has sunk, the slab needs to be raised back to grade. Both approaches are used depending on the situation, and both are checked against the DOT standard for allowable height difference between flags.
Where we provide this service
Concrete Leveling is available across Manhattan, Brooklyn, Queens and The Bronx. Every borough files permits and fails differently, and the borough pages explain what that means for your block.