In 1958, a company called Sarna was formed in Switzerland to develop polymeric products, and in 1962 this small company did something very big. Company chemists developed the first PVC membrane reinforced with fabric, leading to a number of industrial applications that included a growing roofing and waterproofing membrane market. This tear-resistant PVC membrane was patented and trademarked “Sarnafil.” The discovery would revolutionize the single-ply roofing industry forever.