Protection/repair of existing buildings from water/salt damage. Seminar discusses the restoration of old and historic buildings and the protection of the building fabric from water and damaging salts. Damp walls hold a combination of water and salt, when salts crystallize they cause immense pressure destroying the building surface and event bricks. Covers environmental issues, the planning, preparation and installation of horizontal barriers, external and internal waterproofing, renders and silicate based paints