The core activity of Dünnenberger AG encompasses the planning, execution and maintenance of work in the field of building envelopes, particularly: Metalwork: work on pitched and flat roofs, facades and roof inspections; Flat roofs: sealing work with bituminous sealing strips, plastic films and liquid plastics; Lightning protection: installation and maintenance of lightning protection systems; Facades: work on facades, including installation and maintenance of rainwater storage systems and terrace drainage covers. The company thus offers comprehensive services for the construction, maintenance and repair of building envelopes.