Concrete grinding An abrasive mechanical process that uses diamond-tipped blades to shave down raised concrete edges and eliminate small vertical trip hazards.
Concrete grinding is a fast way to remove minor lip trip hazards of less than an inch on private pathways. However, for NYC public sidewalks, grinding is strictly restricted. Excessive grinding thins out the concrete flag, making it weak and highly prone to cracking. If a flag is raised by an inch or more, the DOT generally requires a full replacement rather than grinding.
Frequently Asked Questions About Concrete grinding
What is concrete grinding?
An abrasive process using diamond-tipped equipment to shave down a raised concrete edge and remove a small vertical trip hazard.
Can grinding clear a NYC sidewalk violation?
Its use is restricted. Where a flag is significantly raised, DOT generally requires full replacement rather than grinding.
Why is heavy grinding a problem?
It thins the slab, weakening it and leaving it prone to cracking, and it can leave a rough or off-slope surface.
When is grinding reasonable?
For a minor lip on private pathways, or as an interim safety measure while a compliant repair is scheduled.