A roof  panel with a traditional appearance and cutting edge form, equipped with a standing seam, the LAMBDA® roof panel is generally recommended for the renovation of buildings subject to preservation/conservation orders and for religious buildings. However, it is also frequently used in newly-built apartment buildings, detached houses and public buildings. It is much faster and more easily assembled than steel sheets with a double seam. Its increased rigidity enables it to be fixed to roof patches without the need to plank the roof slope. These advantages also make it possible to use the LAMBDA® as a wall panel, in order to provide a unique vertical or horizontal facade finishing.