We often see rescue attempts like this. The owner of the building has water infiltrations and the humidity level is high in the basement. The landlord is advised simply to remove the water from the house and to correct the slopes and that this will solve his problem forever. Unfortunately no … If the water enters through the foundations it is already too late. The waterproofing of the foundations is absent or even non-existent and the concrete is therefore constantly soaked with water. It is certain that after the installation of a good elastomeric membrane on the foundation it will be necessary to ensure that the water will move away from the foundations but the first step when seeing water on the basement floor or on the walls of foundations is to bring an expert who can give you a true opinion on the subject! So we can look at whether there is a French drain, if it can be cleaned and if the water comes from the underground part of the foundations.