Karl Landl

Büsscher & Hoffmann GmbH engages in the production of bitumen and polymer bitumen membranes. Its products are used for the protection of flat, green, and pitched roofs; bridge waterproofing; and structural sealing against the effects of weather and environment. The company was founded by Friedrich Wilhelm Büsscher and Friedrich Eduard Hoffmann in 1852 and is headquartered in Enns, Austria.

POLYFIN AG engages in the provision of roofing and civil engineering services. The firm manufactures roofing and waterproofing products. It offers indoor floor sealing, tank and reservoir sealing, parking deck sealing, as well as sealing membranes for flat roof, buildings, and ground attached components. The company is headquartered in Meckesheim, Germany.