What is the minimum vertical clearance above a spiral stairway?

The minimum vertical clearance above a spiral stairway is important for ensuring safe and comfortable passage for users. A clearance of 78 inches provides adequate headroom, allowing individuals to walk up and down the stairs without obstruction or risk of injury. This specific height is aligned with building codes and safety standards, which aim to accommodate a wide range of users, including those who are taller.

Ensuring that the clearance is sufficient helps prevent accidents that could occur if someone were to bump their head during use. In contrast, the lower clearances specified in some of the other options do not meet the necessary standards for safe and functional stairway usage. Thus, 78 inches has been established as a minimum requirement in order to facilitate safe navigation in environments where spiral stairways are common.