Sidewalk Foam Jacking

Sidewalk foam jacking being used to fix a trip hazard in a sidewalk

Sidewalk foam jacking repair before & after.

Foam jacking is a great repair method for addressing settlement and trip hazards in sidewalks.  Sidewalk foam jacking raises settled, uneven sidewalks back into position by injecting high density foam below them.  The grout is pumped under pressure, and gently lifts the sidewalk back into place.  

How Foam Jacking Works

Foam jacking works by pumping foam below the sidewalk to gently push it back up into place.  The process is deliberate and controlled.  The foam is injected as a liquid, through dime-size holes drilled through the sidewalk.  Once under the sidewalk, the liquid spreads out and gently expands.  This lifts the slab into place. In situations where a tree root has raised a section of sidewalk, we can not push that area back down.  However, we use foam jacking to raise the adjacent slabs to address the trip hazards.  Sometimes, if a sidewalk has been raised above something that can’t be foam jacked, such as a door threshold, then the sidewalk needs to be replaced.

Sidewalk foam jacking usually requires drilling two or three holes per sidewalk slab.  Foam is pumped through the holes to fill voids and lift the sidewalk.  After the foam injection is done, the holes are cleaned out, and patched with concrete.  You may walk on the sidewalk immediately afterwards.  Sometimes more holes are required if a slab is larger than normal or has settled in a twisting fashion.  Concrete Jack’s foam jacking crews carry different colors of cement and sand on their trucks. This is in order to match patches to the color and texture of the existing slab as closely as possible.  It takes time of the patches to age and match dirty concrete, though.  Either way, the patches are much less noticeable than large sections of replaced concrete.

Benefits of Sidewalk Foam Jacking

The benefits of using foam jacking instead of replacement are numerous:

  1. Cost.  Foam jacking is significantly less expensive than replacement
  2. Disruption.  Foam jacking is much quicker and cleaner than replacement or mudjacking
  3. No loss of use.  With foam jacking, you can walk on a sidewalk during foam jacking, and right afterwards.
  4. Warranty.  We warranty most sidewalk foam jacking repairs.  Try finding replacement contractor that will provide a written warranty.
  5. Environmentally friendly.  Foam jacking is better than replacement for the environment because concrete is recycled in place.

Alternatives of Foam Jacking

Mudjacking a sidewalk instead of using sidewalk foam jacking for the repair.

Mudjacking a sidewalk.

Mudjacking is the process that foam jacking evolved from.  Mudjacking uses cement & lime-based grout instead of foam as the lifting material.  Foam jacking doesn’t work as well as mudjacking for repairing narrow sidewalks.  Concrete Jack does both foam jacking & foam jacking.  Our estimators are trained to determine which method is most appropriate and economical.

Mudjacking is also generally faster and has better results than foam jacking when sidewalks have twisted a lot from tree roots.

Cost of Sidewalk Foam Jacking

Using foam jacking to raise a settled or correct unevenness in a sidewalk usually costs around 1/4 to 1/2 the cost of replacing the same area.  You can request a free quote from Concrete Jack for your sidewalk foam jacking project.  Please note that we only work in Virginia, Maryland, DC & The OBX.