Folded steel stair treads providing the substructure for the tread cover are welded between the box-type stringers. Another decisive element of the impressive stair architecture is the plain underside soffit.
With an inner diameter of 2,200 mm and an outer diameter of 5,600mm a generous flight width of 1,600 mm is obtained. The staircase design complies with the regulations of the construction authorities concerning glass railings and with DIN 18065.
The free-standing spiral staircase in the showroom is self-supporting. This means that all forces are borne by the floor slab underneath and above. Additional fastening to walls or support by columns is not required.