Kemper System, Kemperol Liquid Roofing, Liquid Waterproofing and Surfacing, Flat roof repair and refurbishment. Kemper System the home of sustainable liquid roofing What have the Gherkin in London, the BMW car plant in Steyr and the Empire State building in New York all have in common? Along with countless numbers of buildings and structures world-wide, they are all protected by Kemperol liquid waterproofing supplied by Kemper System. In 1957, Dr Kemper developed the company's first liquid roofing system, a wet-on-wet, cold liquid-applied, fully fleece reinforced resin waterproofing membrane. Since then, Kemper System products have demonstrated proven performance on billions of square metres around the world. Today, Kemper System is a worldwide leader in manufacturing the highest quality wet-on-wet, cold applied liquid waterproofing and roofing membranes for the construction industry.