Steel is the foundational material of Siller Treppen's fabrication capability — the medium in which the manufacturer's structural and formal ambitions are most freely realised. A steel staircase from Siller can range from the refined and minimal — a slender folded-plate stringer with flush-polished surface — to the deliberately industrial, with open perforated treads and exposed weld detailing that celebrates the material's manufactured character. In all cases, the precision of the fabrication is the measure of quality: the straightness of the stringer, the flatness of the tread surface, the tightness of the joint.
Structural steel staircases by Siller are fabricated from mild steel, stainless steel, Corten weathering steel, or galvanised sections depending on the environmental exposure and design intent of the project. Surface treatments span powder coating in any RAL colour, hot-rolled mill finish preserved under clear lacquer, mirror or brushed polishing, and raw patina for interiors where the oxidisation of the surface is itself the design. Open grating, chequerplate, or solid flat plate treads are all available, and the balustrade configuration — from solid steel panels to horizontal cable tensioning or frameless glass infill — is entirely customisable.
Steel staircases by Siller are specified across an unusually wide project typology: industrial-aesthetic residential lofts, precision-crafted contemporary offices, robust public circulation in cultural buildings, outdoor staircases in gardens and on terraces, and industrial facilities where durability and load capacity are primary requirements. The material's strength-to-weight ratio and weldability make it the most versatile substrate in the manufacturer's palette.
