SlabJacking(also referred to as MudJacking, Concrete Lifting or Concrete Leveling) is a proven alternative to concrete replacement dating back to the early 1930's. Concrete settles for a variety of reasons. The #1 reason is that the base simply was not compacted properly before the concrete was poured. Over time the sub-base simply fails under the weight of the new slab and therefore settles. SlabJacking is the proven answer. Here is the first of two clients for whom we lifted their concrete in 1992 sending us a letter of referral in 2002,s till happy 10 years later!