What is the maximum allowable variation in riser height or tread depth for a stairway?

The correct choice regarding the maximum allowable variation in riser height or tread depth for a stairway is a critical aspect of construction safety standards to ensure consistent and safe stair construction. The OSHA standard stipulates that the maximum variation should not exceed 1/4 inch. This limitation is in place to minimize trip hazards and ensure that all steps in a flight of stairs are uniform.

Uniformity in riser height and tread depth is essential for creating a predictable walking path. Variations greater than this can lead to an increased risk of slips, trips, and falls, which are significant safety concerns in the construction and general environment.

To ensure safe stairways, it’s important for constructors and safety trainers to understand these specifications, as adherence to the 1/4 inch rule significantly contributes to the overall safety and accessibility of structures. This standard promotes best practices in stairway design and maintains compliance with OSHA regulations, ultimately safeguarding the health and safety of all users.