CDPH Lead Inspector/Assessor California State Practice Exam

Which part of the staircase is responsible for vertical transitions between treads?

1. The riser

2. The stringer

3. The tread

4. The railing

The correct answer is: The riser

The riser is the component of a staircase that is responsible for the vertical transitions between treads. It is the vertical section between each step, providing the necessary height for each level as you ascend or descend the staircase. By connecting the treads, which are the horizontal surfaces on which people step, the risers contribute to the overall structure and stability of the stairway. In the context of a staircase, the stringer serves as the support structure that holds the treads and risers together, while the tread is the part where the foot makes contact. The railing is an additional safety feature that provides support and stability for individuals using the stairs, but it does not play a role in the vertical transition between treads. Therefore, the riser is essential for understanding the relationship between the steps in a staircase and is crucial for proper design and safety standards.