What are the spindles on a banister called?

Staircase Terminology Demystified: The Vertical Posts

Brief Summary

The vertical posts in a railing system that support the handrail are most accurately called balusters. However, they are also commonly referred to as spindles. Although both terms are used interchangeably, “baluster” is the more technically precise term within the construction and architectural fields.

Expanded Answer

Balusters: The Technically Correct Term

• Definition & Function: Balusters are the vertical members that provide support to the handrail and fill the space between the newel posts (the larger posts that anchor the railing at key points). They serve a crucial role in staircase safety by preventing falls, while also contributing significantly to the aesthetic design of the staircase.
• Etymology: The term “baluster” originates from the Italian word “balaustra,” which translates to “wild pomegranate flower.” This is because the shape of early balusters often resembled the bulbous form of a pomegranate bud.
• Material & Design Diversity: Balusters can be crafted from a wide array of materials, including wood, metal, glass, and even stone or concrete. They also come in various shapes and styles, from simple turned or square profiles to elaborate and decorative designs.

Spindle: The Common Colloquialism

• Usage: The term “spindle” is often used interchangeably with “baluster”, especially in casual conversation or when referring to simpler or thinner designs.
• Origin: The word “spindle” likely stems from its resemblance to the tool used for spinning fibers, which has a similar elongated and slender shape.
• Perception: “Spindle” is sometimes seen as a more accessible and easier-to-remember term than the more technical “baluster.”

Building Codes & Safety Considerations

• Spacing: Regardless of whether they are called balusters or spindles, these vertical members must adhere to specific building codes and safety regulations. In the USA, the typical requirement is a maximum 4-inch gap between balusters to prevent children from passing through or getting stuck. This is often referred to as the “4-inch sphere rule.”
• Height: The overall height of the railing system, including the balusters, must also meet minimum standards, typically around 34-38 inches for residential staircases, to prevent falls.
• Strength: The balusters must be securely attached and strong enough to withstand anticipated loads and forces, ensuring the overall stability of the railing system.

Conclusion

While the terms “baluster” and “spindle” are often used interchangeably in everyday language, understanding their technical distinction can be helpful, especially when communicating with professionals in the construction or design industry. Whether you choose to call them balusters or spindles, these vertical supports are essential elements in any staircase, providing both safety and visual appeal.