The PRS (Pressure Relief System) or French Drain is the most common basement waterproofing solution for issues with hydrostatic pressure. This process consists of breaking up the concrete floor and digging a trench around the perimeter or partial perimeter of thebasement. The trench is then lined with filter fabric, a 4” perforated pipe is installed and covered with stone. Finally a drainage board isinstalled against the wall and over the footing before the system is concreted over. The piping then drains into a sump pump basin. This relieves hydrostatic pressure both on the walls and the floor of the structure.