What is the maximum variation in tread depth allowed within a flight of stairs?

The maximum variation in tread depth allowed within a flight of stairs is critical for safety and accessibility. A difference of 3/8-inch ensures that users can navigate the stairs comfortably and minimizes the risk of tripping or misstepping. An inconsistency beyond this measurement could lead to hazards for those using the stairs, as it would disrupt the rhythm of ascent and descent.

This standard is established to create a uniform experience when traversing stairs, emphasizing the importance of building codes and regulations in maintaining safety in residential and commercial structures. The other options present larger tolerances, which could compromise safety by introducing significant variations in step height, thereby increasing the likelihood of accidents. Maintaining this specific limit is an essential part of ensuring that stairways are compliant with safety standards and are accessible to all users.