A stair design where the vertical space between treads is left open without a solid back panel, creating a more open and airy appearance.

An open riser is a stair design where the vertical space between treads is left open without a solid back panel or riser board, creating a more open and airy appearance that allows light and visual continuity to pass through the staircase. This design approach contrasts with closed riser stairs where solid vertical panels connect each tread, and it is commonly used in modern and contemporary architecture to create a sense of openness and reduce the visual mass of the staircase. Open riser stairs can be constructed with various materials and support systems, but they require careful attention to building codes, safety requirements, and structural considerations to ensure proper performance and compliance.

Open riser stairs are utilized in various architectural applications including residential interiors where they create a sense of spaciousness and allow natural light to flow through multi-level spaces, commercial buildings such as offices, retail spaces, and public buildings where open stairs contribute to modern aesthetic goals, industrial and loft-style spaces where the structural elements become part of the design vocabulary, outdoor applications including deck stairs, landscape stairs, and fire escapes where weather resistance and drainage are important considerations, and specialty installations such as floating stairs, cantilevered designs, and sculptural staircases that emphasize the open riser concept as a key design element.

The construction and structural considerations for open riser stairs require robust tread support systems since the absence of risers eliminates a significant structural element that normally provides stability and load distribution, connection details that securely attach treads to stringers, carriages, or support structures without visible riser connections, material selection that can span the full tread depth without intermediate support while maintaining appropriate deflection limits, and consideration of tread thickness and reinforcement to handle concentrated loads and prevent excessive deflection or vibration. Structural analysis must account for the reduced stiffness compared to closed riser stairs and may require additional bracing or support elements.

Fun Fact: Open riser stairs became popular in mid-century modern architecture of the 1950s as architects like Richard Neutra and Joseph Eichler used them to create visual lightness and maintain the connection between indoor and outdoor spaces.

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