Osmosis ‘Passive'

The old, ‘passive’ system used copper wires, which unfortunately corroded, but the latest Lectros Active System utilises a titanium wire, connected to a special mains powered control box, which is run around the walls rather like a ring main.

Bent at regular intervals to form anodes, the wire loops are inserted into large holes drilled into the wall (internally, externally or both if necessary). The wire is hidden in formed "chases" or existing, raked out brickwork joints and the whole system is earthed. The electricity from the mains supply passes through a transformer, through the anodes and to earth, setting up an electrical field, which repels the damp. The holes are filled with a special mortar, to ensure good conductivity. This method requires large drilling machines, expensive drill bits and special mortars.