How to Repair a Cracked Concrete Foundation Slab


Concrete slab foundations serve as the base of many structures, including homes, commercial buildings and storage buildings. As structures settle or shift from ground disturbances, the foundation slab may sometimes crack. This can be something minor that simply needs filling in or something major that needs the assistance of a contractor. It is best to find out which type of damage you have before proceeding. If a contractor tells you that it isn't a major concern, consider repairing it yourself and saving some money.

Things You'll Need

  • Epoxy concrete sealer kit and applicator
  • Scrub brush
  • Water
  • Water hose
  • Locate the crack in the foundation. Scrub the area with water and a scrub brush to loosen particles, then rinse out the crack with a water hose. This will ensure no small, loose pieces are inside. Allow the area to dry completely.

  • Place injection ports over the crack. Use the epoxy paste that comes with the kit to secure them to the floor. Space them based on the floor thickness. If the thickness is 12 inches, space the ports 12 inches apart.

  • Spread the epoxy adhesive that comes in the kit over the crack and around the base of the ports to seal the crack shut. This will keep the injection material from coming back out and force it to work its way down into the crack. Wait 45 minutes for the epoxy to dry.

  • Inject the material into a port at one end of the floor crack. Inject the substance until it starts to come out of the next port. At this point, insert a cap into the first port and move on to the next one. Keep doing this until you finish the last port. Allow to dry for two days.

  • Tap the ports with a hammer to detach them from the floor.

  • Chip the surface seal off with a chisel if you don't care for the look.

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