Zigzag mono-stringer

A shimmering geometric monolith in stainless steel, the Z2 immediately commands attention.

Mono-stringer designs such as the M1 and M2 are an ideal option for many situations with their open structure and minimalist design. However, because the structural members and support plates are exposed, they have a bias towards a functional or industrial presentation. In contrast, the structural frame of the Z2 zigzag mono-stringer is entirely concealed behind polished stainless steel zigzag plate. It essentially combines the strengths of the mono-stringer approach with a highly sophisticated and elegant finish. Thus, the Z2 is particularly suitable for modern prestige residences.

By cladding the mono-stringer support structure in a seamless stainless steel shell, the staircase gives the impression that it has been sculpted from a single solid billet of metal. This inspires a feeling of solidity and substance without diminishing the airiness of the mono-stringer design. The highly reflective surfaces in fact add to the translucent qualities of this staircase.

The Z2 combines particularly effectively with a frameless glass or face-fixed balustrade systems, enhancing transparency and emphasising the zigzag stringer feature.


The Z2 is built around two laser cut mild steel core stringers. These are bound together with short lengths of square hollow section steel to form a ladder frame. More lengths of SHS are added to each side of the frame to anchor and support the treads. The core is then clad with 3mm plate stainless steel with all welds ground flush and polished to give a seamless finish. Once the stringer is installed the steps are constructed by screwing blocks of ply between the SHS outriggers and centre sections. The dress wood veneers and nosings are then bonded to these ply cores.


Arden Architectural is a BSA licensed contractor for carpentry, joinery, glass, glazing and aluminium as well as structural metal fabrication and erection. Arden supplies a Form 16 (Licensed Contractor) on all projects. In design and construct contracts, a Form 15 (Design Engineer) certification is supplied upon request. For products and services incorporating this design element, the table below details compliance with relevant codes and standards.

Title Applicability
BCA The Building Code of Australia Full compliance
AS NZS 1170.1-2002 Structural Design Actions – Permanent, imposed and other actions Full compliance
AS 1288-2006 Glass in Buildings. Selection and installation Not applicable
AS NZS 1554.1-2004 Structural steel welding - Welding of steel structures Full compliance
AS 1554.6-1994 Welding stainless steels for structural purposes Full compliance
AS NZS 4586-2004 Slip resistance classification of new pedestrian surface materials Full compliance
AS 1428.1-2001 Design for access and mobility Conditional *
AS 1657-1992 Fixed platforms, walkways, stairways and ladders. Design,
construction and installation
Full compliance

* Requires opaque risers for compliance.