Circulation

• Closed riser

  A closed riser is a vertical architectural component of a staircase that fills the space between two consecutive treads, completely enclosing the gap. This traditional design provides enhanced structural stability and safety by preventing items or feet from slipping through the steps. Closed risers offer a solid, substantial appearance that complements various architectural styles while also providing practical benefits such as improved acoustic insulation, increased privacy between floors, and the ability to utilize the space underneath the stairs for storage or utility rooms.

• Flight

  A flight is an uninterrupted series of steps or risers that connects two floors, landings, or levels within a building. It serves as a fundamental component of vertical circulation, providing a continuous path and structural stability while accommodating various architectural designs such as straight, curved, or spiral configurations.

• Guardrail

  A guardrail is a critical safety and structural element designed to prevent accidental falls from elevated walking surfaces, such as stairs, landings, balconies, and decks. Typically required by building codes when a surface drop exceeds 30 inches, it serves as a protective barrier composed of a top rail, intermediate members like balusters or panels, and vertical posts. Unlike handrails, which provide guidance and support for balance, guardrails are life-saving devices engineered to withstand significant force and restrict passage through open edges, often featuring specific height and opening limitations to ensure the safety of building occupants.

• Handrail

  A handrail is a horizontal or sloped rail designed to be grasped by the hand to provide stability, support, and safety for individuals navigating stairways, ramps, or corridors. Typically supported by posts, balusters, or mounted directly to walls, it serves as a critical safety feature to prevent falls and assist users with mobility. While primarily functional and often regulated by strict building codes regarding height and graspability, handrails also contribute to the aesthetic character of a space and can be crafted from various materials such as wood, metal, glass, or plastic to complement a building's architectural style.

• Landing

  A landing is a flat, horizontal platform situated at the top or bottom of a staircase or between two flights of stairs to provide a resting place and facilitate a change in direction. It serves as a critical transitional space that enhances safety and accessibility by breaking up long runs of steps, thereby reducing the risk of falls and providing a pause point for users. Beyond its functional utility in managing vertical circulation and foot traffic flow, a landing can also function as an aesthetic feature, offering space for decorative elements, windows, or seating areas within a building's design.

• Newel post

  A newel post is a primary vertical structural element that supports and anchors the handrail of a staircase, located at the bottom, top, or at turning points like landings. As the architectural backbone of a balustrade system, it is designed to resist lateral loads and provide stability, ensuring the railing remains rigid and secure. While serving a critical load-bearing function, newel posts also act as prominent decorative features, ranging from simple geometric box designs to ornate, lathe-turned pillars that define a building's interior style.

• Open riser

  An open riser is a stair design characterized by the absence of vertical riser boards between the horizontal treads, creating a series of gaps that allow for a floating appearance. This architectural feature is primarily used to enhance the sense of openness and airiness within a space by facilitating the flow of natural and artificial light through the staircase. Typically found in modern and minimalist interior designs, open risers transform a functional vertical circulation element into a sculptural focal point that visually expands smaller rooms and preserves sightlines across open-plan layouts. To maintain structural integrity and comply with safety building codes, these stairs often utilize thicker treads and specialized support systems like mono or double stringers.

• Riser

  A riser is a vertical architectural element that represents the upright face between two successive treads in a staircase. It serves a critical structural role by connecting the treads and stringers to stiffen the overall assembly, while also acting as a safety barrier that prevents feet from slipping between steps. In addition to stairs, the term refers to any vertical run of building services, such as plumbing pipes, electrical wiring, or HVAC ductwork, that travels through the floors of a structure to distribute utilities.

• Spiral stair

  A spiral stair is a compact architectural feature consisting of steps that radiate from and rotate around a single central pole or column, which acts as the primary structural support. Its helical design allows for vertical circulation within a minimal footprint, making it a space-efficient solution for tight interiors or as a secondary access point. Beyond their functional utility in optimizing floor area, spiral stairs are often used as striking aesthetic focal points and can be constructed from a wide range of materials, including metal, wood, and stone, for both interior and exterior applications.

• Stair

  A stair is a fundamental architectural element consisting of a series of steps designed to bridge vertical distances between different levels or floors of a building. Each individual stair is typically composed of a horizontal tread for stepping and a vertical riser, serving as a primary means of vertical circulation that ensures accessibility and safety. Beyond their practical function, stairs act as significant design features that define a building's character, ranging from simple straight runs to complex spiral or sculptural forms, and are constructed from various materials like wood, stone, metal, or concrete to enhance the overall aesthetic of a space.

• Stringer

  A stringer is a fundamental structural element in staircase construction that serves as the inclined support beam or board running along the sides or center of a stairway. Its primary function is to provide the framework that holds treads and risers in place, anchoring the steps and distributing the weight of users to the building's foundation. Stringers can be designed in various configurations, such as "cut" or "open" stringers with notched edges to support treads, "closed" or "housed" stringers that conceal the edges of the steps, or "mono" stringers featuring a single central support for a modern, minimalist look. Crafted from materials like wood, steel, aluminum, or concrete, stringers are critical for ensuring the structural integrity, safety, and aesthetic character of both residential and commercial vertical circulation systems.

• Switchback stair

  A switchback stair, also known as a U-shaped or half-turn staircase, is a space-efficient vertical circulation element consisting of two parallel flights of stairs that change direction by 180 degrees at an intermediate landing. This design allows the staircase to double back on itself, occupying less linear floor space than a straight-run stair while providing a natural resting point at the turn. Commonly utilized in both multi-story residential high-rises and commercial office buildings, switchback stairs offer high functionality for pedestrian traffic and can be customized with various materials like wood, metal, or glass to serve as a modern architectural focal point.

• Tread

  A tread is the horizontal portion of a step in a staircase that serves as the primary walking surface for ascending or descending between levels. Typically constructed from durable materials such as wood, metal, stone, or concrete, the tread provides a flat, stable plane designed to support the weight of users while ensuring safety and comfort. Key dimensions of a tread include its depth, which determines foot placement, and the nosing, which is the front edge that often overhangs the riser to improve visibility and provide additional foot space. In architectural design, treads are critical for maintaining consistent proportions within a flight of stairs and may incorporate non-slip textures or decorative finishes to enhance both functionality and the overall aesthetic of the vertical circulation system.