Slabjacking and hydraulic jacking, or piering, are the two main methods for foundation repair. During a slabjacking operation, professionals pump the grout under a slab, which creates a lifting force that brings up a slab or beam to the level it's supposed to be. During a piering operation, professionals install steel posts through the unstable ground. Next, they use hydraulic jacks to bring up the concrete slabs affected by changes in the ground.
When choosing the method for a concrete foundation repair, it is important to find out why the foundation is in poor condition. Professionals usually use slabjacking for smaller areas that need repairs, such as concrete driveways, swimming pool decks and sidewalks. For slabjacking, contractors need to make small holes in the slab and fill them with cement grout.
Piering works better for larger projects, such as repairing building foundations. After raising the foundation with mechanical jacks, professionals insert a special footing and pier that holds the foundation at the set level and prevents it from becoming damaged again. The footing is installed deep inside the ground to ensure moisture in the soil doesn't affect it. The piering evenly distributes weight to avoid bulk and mass. The pier usually holds up the foundation beam.