STAIRCASE STYLES

Tube Style Stairs

Tube style staircases use hollow structural section (HSS) steel tubing as the primary stringer material, creating a clean, modern aesthetic with slender profiles and precise geometric lines. This design approach leverages the strength-to-weight advantages of tubular steel sections to support treads while maintaining a refined, minimalist appearance. Tube style stringers can be applied across single undermount, double undermount, and side-mounted staircase configurations, offering versatility in how the structural support is positioned and expressed within the overall design.

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Design Features

HSS tube steel provides exceptional structural efficiency—the hollow rectangular or square profile delivers high strength with minimal material, allowing for slender stringers that don’t visually dominate the staircase. Common tube sizes range from 4″ x 6″ for residential applications to 6″ x 8″ for wider spans or commercial installations, with the tube dimensions selected based on structural requirements and desired visual proportions.

The clean geometry of tubular stringers creates precise shadow lines and crisp edges that complement contemporary architecture. Unlike channel sections with open sides or I-beams with exposed flanges, tube stringers present closed profiles on all sides, creating a refined, finished appearance from any viewing angle. This makes them particularly effective when the staircase is visible from multiple directions or serves as a central architectural element.

Tube style designs often incorporate matching tubular riser supports—square, rectangular, or round tubes that connect the stringer to tread undersides. These coordinated tube profiles create visual continuity throughout the structural system, reinforcing the geometric clarity that defines the design.

Structural Configurations

Single Undermount Configuration

In single undermount applications, a central HSS tube stringer runs beneath the treads, creating a streamlined profile with minimal structural presence. The tube can be positioned centrally or offset to one side depending on load distribution requirements and aesthetic preferences. This configuration maximizes openness below the staircase while the singular tube profile maintains clean sight lines.

Riser tubes connect the main stringer to tread undersides, with tube size and profile selected to balance structural requirements with visual lightness. The undermount positioning allows tread edges to remain clean and uninterrupted, emphasizing the floating quality of the design.

Double Undermount and Side-Mounted Configurations

Double undermount configurations use tube stringers along both outer edges beneath the treads, providing increased load capacity for wider staircases while maintaining the refined tube aesthetic. Side-mounted applications position tube stringers along the staircase sides, with treads connecting directly to the tube faces through visible or concealed brackets.

Both configurations benefit from the tube profile’s inherent structural efficiency and clean geometric presentation. The choice between undermount and side-mounted positioning depends on architectural context, structural requirements, and desired visual emphasis.

Customization Options

Each tube style staircase is engineered with HSS dimensions specified for the project’s span, width, and load requirements. Steel tubing can be finished with powder coating in any color, industrial paint systems, or raw steel with clear coat protection. Common residential finishes include matte black, charcoal gray, and white to coordinate with interior palettes.

Tread materials integrate seamlessly—hardwood, steel plate, stone, or concrete all mount effectively to tube stringers through welded or bolted connections. Riser tube profiles (square, round, rectangular) can be mixed to create visual interest or maintained uniform for geometric consistency. Guardrail systems in glass, cable, or steel complement the tube style’s modern character.

Ideal Applications

Tube style staircases suit contemporary residential projects, modern commercial interiors, and architectural renovations where refined minimalism and structural efficiency are design priorities. The slender tube profiles work particularly well in open-concept spaces where the staircase should enhance rather than obstruct sight lines.

For architects, designers, and homeowners seeking modern staircase solutions with clean geometric character and proven structural performance, tube style designs deliver versatility across multiple stringer configurations.

Frequently Asked Questions

ABOUT OUR TUBE STAIRCASE STYLE

HSS (Hollow Structural Section) refers to hollow steel tubing with rectangular or square profiles. The hollow interior creates exceptional strength-to-weight ratios—the tube provides robust structural capacity while remaining relatively lightweight and slender. This makes HSS ideal for modern staircases where you want strong support without heavy, bulky stringers. The closed profile presents a finished appearance from all viewing angles, unlike channel or I-beam sections with exposed edges.

Yes, tube style refers to the material and profile choice rather than the stringer configuration. HSS tube stringers can be specified for single undermount (one central stringer), double undermount (stringers along both edges beneath treads), or side-mounted applications (stringers along the outer sides). Your architect or designer selects the stringer configuration based on structural requirements and aesthetic goals, then specifies tube style if that geometric character suits the design.

Common HSS sizes for residential applications range from 4″ x 6″ for standard straight runs to 6″ x 8″ for wider spans or heavier load requirements. The tube dimensions are engineered based on your staircase’s specific width, span, and load conditions. Larger commercial projects may require heavier tube sections. Our engineering team calculates the appropriate HSS size to meet BC Building Code requirements while optimizing the visual proportions for your space.

Attachment methods depend on the stringer configuration. In undermount designs, treads rest on riser tubes that connect to the main stringer, with connections welded or bolted from below to keep top surfaces clean. In side-mounted configurations, treads attach to the tube faces through brackets—either visible as design elements or concealed within the tread-to-stringer connection. All connection methods are engineered to meet structural requirements and BC Building Code specifications.

Next Steps for Your Tube Stairs Project

Currently planning a custom build or renovation?

Share your project details, space measurements, and design inspiration with our team. We’ll review your requirements and provide guidance on feasibility, timeline, and budget considerations for a custom tube style staircase.

Working with an architect or designer?

We collaborate directly with design professionals throughout the Greater Vancouver area. Request our technical specifications and HSS engineering details to incorporate into your project plans.

Exploring staircase options?

Compare our full range of modern staircase styles, including plate guard, C-channel industrial, I-beam, and profile cut plate designs. Each offers distinct aesthetic and structural characteristics for contemporary spaces.

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