Concrete raising is a specialty concrete repair technology. In essence, we attempt to lift a sunken concrete slab by pumping polyeurethane foam through the concrete, effectively pushing it up from below.

Accounts of raising large concrete slabs through the use of hydraulic pressure date back to the early 20th century. Early contractors used a mixture of locally available soils (sometimes including crushed limestone and/or cement for strength), producing a “mud-like” substance and thus the term “mudjacking.” In recent years, contractors began using expanding polyurethane foam. Each method has its benefits and disadvantages.

The raising process generally starts with drilling access holes in the concrete, strategically located to maximize lift. These holes range in size from 3/8″ up to 3″ depending on the process used.

Initial material injections fill any under slab void space. Once the void space is filled, subsequent injections will start lifting the concrete within minutes. After the slabs are lifted, the access holes are patched and the work is complete. The process is rapid when compared to traditional remove and replace applications and is minimally disturbing to the surrounding areas.