• Mono stringer: One central steel spine supports the treads for a clean, minimalist look.
  • Double stringer: Two steel stringers (often on each side or spaced under the treads) for a more substantial, architectural feel and added rigidity.
  • Cantilever: Treads project from a wall/structural support with no visible stringer on the open side. This is the most “floating” look and typically requires specific structural conditions.