Traditional underpinning; the mass concrete underpinning method is nearly 100 years in age, and the protocol has not changed. This underpinning method strengthens an existing structure's foundation by excavating strategical areas by hand or by mini excavator underneath and sequentially pouring concrete in a strategic order. Before actually pouring the new foundation walls under the existing, rebar reinforcement is installed to attache and secure the walls together. The final result is basically a foundation built underneath the existing foundation. This underpinning method is generally applied when the existing foundation is at a shallow depth. There are several advantages to using this method of underpinning including the simplicity of the engineering, the low cost of labor to produce the result, and the continuity of the structure's uses during construction. After the underpinning is completed, the rest of the basement is excavated, drainage gravel is installed, interior rigid french drains are installed and attached to a sump pump pit. A drainage membrane such as DELTA MS is installed over the gravel, french drains, and up vertically over the foundation walls to protect from any possible water infiltration from the joint of the new and existing foundation walls. The final step is to pour a new concrete slab floor.