Electro=osmotic drying of damp basements - by applying conductive non-metallic plaster to inside walls and applying controlled DC between them and non-metallic earthed grounds

The process comprises (a) applying, as a first electrode an electrically conductive non-metallic plaster to the walls (b) boring several holes in the wall just above flor level and filling them with the plaster to form an extension of the first electrode. (c) placing several conductive non-metallic grounds in the earth around the walls, forming a second electrode; (d) applying a positive D.C. voltage to the first electrode and a negative one to the second electrode. The number of grounds is determined by the current density at the interface of the walls and the plaster electrode, the current density being =0.25 x 10-4 x t-1 A/cm2 (t = thickness of the wall) and being =10-4 A/cm2 at the building-directed face of the grounds. The first electrode is formed from e.g. a mixt. of colloidal graphite, polyvinyl acetate emulsion and water. The electrodes are prevented from corrosion to the utmost, and a uniform electric field in the anode prevents moisture seepage. The system is economic and gives efficient electro-osmotic drainage of water outwards.