What are the vertical components of a stairway called?

The vertical components of a stairway are referred to as risers. Risers are the sections that connect each tread and provide the vertical height of each step. They are crucial for the overall design and function of the stairway, dictating how high each step is and ensuring that the stairs are safe and comfortable to navigate. Proper riser height is essential for compliance with building codes and regulations, as it affects the ease of movement and stability of the stairway.

In contrast, treads are the horizontal parts of the stair where the foot lands, and rails refer to the handrails that provide support for individuals using the stairs. Steps encompass both the treads and risers combined, but when specifically discussing the vertical components, risers are the correct term.