What is the maximum allowable nosing for solid risers on stairways?

The maximum allowable nosing for solid risers on stairways is three-fourths of an inch. Nosing refers to the portion of the tread that extends beyond the riser. This dimension is critical for safety as it can affect both the ease of climbing and the potential for tripping.

A nosing that exceeds this measurement can create hazards, making it more difficult to navigate the stairs. Adhering to the three-fourths inch limit ensures that stairways remain compliant with safety standards, providing a consistent and safe experience for users. In practice, this means that inspectors should look for this specific depth when evaluating stairwell design to confirm that it aligns with building codes that promote safe construction practices.