Graepel safety gratings make roofs accessible so that superstructural parts such as air conditioners, solar energy systems, advertising structures etc. can be installed and maintained. The custom design of hot-dip galvanized metal profile gratings with railing on one side provides for safe accessibility in all weathers. The Graepel-Stabil Xtrem perforation offers maximum slip resistance and an extreme drainage effect at the same time. Other materials (such as stainless steel and aluminum) and perforations can be used on request.