Why do sidewalks lift and crack, and what can be done?
Tree roots are the leading cause on older streets. Mature trees in Land Park, East Sacramento and Curtis Park push up slabs as the roots grow. This creates trip hazards, and a slab that rises half an inch can catch a foot.
Other causes include poor drainage, soil that settles, and slabs poured too thin. Clay soil moves with the seasons, so the base under a walk needs to be compacted rock, not bare dirt.
The fix depends on the damage. A slightly raised edge can sometimes be ground down. A badly lifted or broken section is usually cut out and replaced. We trim or protect roots only where it is safe, and you or the tree owner should approve before any cutting. See concrete repair and resurfacing for lighter fixes.

