Flachstahlwangentreppe mit Lichtvoute

Curved flat-steel stringer stairs

Superb stair sculpture

With parapet-high stringers, elegant light cove and smooth-surfaced soffit cladding, the flat steel stringer stairs excel as homogeneous sculpture.

Project description

Sculptural flat-steel stringer stairs

The elegant stairs lead from the basement to the attic and characterise the interior of the upscale single-family home in Münster. Despite the immense amount of steel that was used, the flat steel stringer stairs are defined by their lightness and elegance and blend gracefully into the style of the private residential building. Innovative design solutions, state-of-the-art production, assembly technologies and, last but not least, skilled craftsmanship form the basis for convincing solutions in staircase construction. All this resulted in a fascinating overall ensemble for this building project and lends the residence its unique, representative character.

Excellent craftsmanship for flat-steel stringer stairs

The curved flat steel stringer stairs get their special dynamic from the parapet-high stringers on both sides, which, while serving as fall protection, also emphasise the homogeneous design. In addition, the smooth underside cladding provides for the sculptural appearance of the construction. It is made from precisely shaped steel sheets welded flush with the surface on the underside of the stringers in line with the run of the stairs. As a design element, it also optimises the vibration behaviour of the flat steel stringer stairs and significantly contributes to the structural stability. The indirect lighting on the outer stringer is realised with a sophisticated steel construction. Transparent all-glass railings at the ceiling openings complete the exclusive flat-steel stringer stairs.

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Project details

Spiral flat-steel stringer stairs

  • 3 flights, evenly rounded
  • Both-sided parapet-high flat-steel stringers as fall prevention
  • Diameter of inner/outer stringer approx. 1,850/4,250 mm; stringer height approx. 1,220 – 1,320 mm
  • Effective flight width approx. 1,200 mm
  • Folded steel treads welded in between the stringers

Light cove & handrail for flat-steel stringer stairs

  • Horizontal flat steel welded to the outer stringer, extension as light cove by means of a welded vertical flat steel
  • Vertical completions with tube sections at the stairs foot and head for cable routing and as optical finish

Soffit cladding for flat-steel stringer stairs

  • Exactly shaped steel sheets, flush-welded at the bottom of the stringers according to the stairs run
  • Weld seams accurately finished and ground for a homogeneous appearance
  • Improved statics and optimised vibration behaviour due to structural contribution

Stylish all-glass railings

  • Transparent all-glass railings at the ceiling openings
  • Straight and horizontal run
  • Laminated/tempered safety glass panes, length up to 2,250 mm, glass joints approx. 10-20 mm
  • Flat-steel frame extended to a glass pocket as filling support
  • Fastened by a tested and approved glueing system, optically sealed
  • Stainless steel handrail made of a bent U-section approx. 30×30 mm, top-attached and glued


Kerstin Wessels, Münster