In stair terminology, what do we call the vertical part of the step that supports the tread?

The vertical part of the step that supports the tread is called the riser. In stair construction, the riser is the component that fills the space between the treads, providing the necessary height for each step. This is crucial for the stability and safety of the stairs, as it allows for appropriate step height and helps to ensure that the treads are aligned properly. The riser contributes to the overall structure of the staircase, aiding in its strength and functionality.

The other terms have different meanings: the stringer refers to the inclined structure that supports the treads and risers; the tread is the horizontal part of the step that you actually step on; and the handrail is the railing that you hold onto for support while ascending or descending the stairs. Understanding these terms is essential for anyone involved in carpentry and stair design.