Final answer:
The greatest tread depth within any flight of stairs should not exceed the smallest by more than 3/8 inch according to the International Building Code. This regulation ensures consistency in stair construction to enhance safety.
Step-by-step explanation:
The question is referring to building codes related to the construction of stairways. In the construction industry, uniformity in stair construction is crucial for safety. According to the International Building Code (IBC), which provides comprehensive regulations for construction, including stairway design, the greatest tread depth within any flight of stairs shall not exceed the smallest by more than 3/8 inch. This is to provide a consistent step size throughout the stairway to reduce the risk of falls and injuries. Ensuring that stairs have uniform tread depth is an essential safety measure.