Final answer:
The minimum depth of stairway nosing is 0.75 inches and the maximum is 1.25 inches, which are measurements important for safe stair design and construction.
Step-by-step explanation:
In the context of designing and constructing stairways, the term 'nosing' refers to the part of the tread that projects beyond the riser.
According to building codes and safety standards, the minimum depth of stairway nosing is typically 0.75 inches (3/4 inches), and the maximum permissible depth is usually 1.25 inches (1 1/4 inches). These measurements ensure a safe transition between treads and provide enough surface area for the balls of the feet to grip when ascending or descending.
The minimum depth of stairway nosing is 1-5 inches, and the maximum depth is w=3 inches.
If stairway nosing is required, then the minimum depth is 1-5 inches and the maximum depth is w=3 inches.