Illinois Roofing Practice Exam 2025 - Free Roofing License Practice Questions and Study Guide

The term that describes the horizontal distance of a stair tread from the nose to the riser is "run." In the context of stair construction and design, the run is an important measurement as it affects the overall length of the stair. It essentially helps define how deep each tread is and contributes to the comfort and safety of using the stairs.

Understanding the run is critical because it ensures that individuals can walk up and down stairs without tripping and with ease. This dimension works alongside the rise, which is the vertical height of the stair, to create a balanced and safe stairway.

In contrast, depth typically refers to the total measurement of an object from front to back and isn't used specifically to describe stairs. Flight denotes a series of steps between two landings, while landing refers to the flat area at the top or bottom of the stairs. Each of these terms serves its own purpose in stair design, but the run specifically identifies the horizontal component of a stair tread.