A method for waterproofing below-grade structures includes at least one step of injecting at least one compound adjacent to the surface that is directed toward the outside of a region of soil arranged adjacent to a below-grade structure to be waterproofed. The method further includes at least one step of measuring the electrical resistivity of the at least one region of soil subjected to the injection step. The at least one measurement step is adapted to detect the portions of the region of soil that are affected by the injection of the at least one compound.
