Underpinning or "Free Board Lifting" is a technique developed to address the most severe cases of foundation movement.

When it has been determined that the only remedy for extreme movement of a home's foundation is to eliminate the contact between the foundation and the soil PERMA-PIER Foundation Repair can use a method called Complete Underpinning.

According to the engineer's specifications PERMA-PIER "Foundation Repair" will place piers at intervals under the entire foundation and slowly lift the complete foundation until the soil is no longer able to come into contact with the foundation. Although this method is extreme it will eliminate any need in the future for further repairs of the foundation.