OSHA 30 Hour Construction Program Practice Test

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

1. Less than 1 inch

2. Less than 1/2 inch

3. Less than 1/4 inch

4. Equal to 1 inch

The correct answer is: Less than 1/4 inch

In stairway systems, maintaining uniformity in riser height and tread depth is crucial for ensuring safety and preventing falls. The maximum allowable variation for riser height or tread depth is set at less than 1/4 inch. This standard is in place to ensure that all steps in a stairway are consistent, allowing individuals to navigate stairs safely without missteps. Variations beyond this measurement could lead to accidents, as even small differences can disrupt a person's rhythm while climbing or descending stairs. By adhering strictly to the less than 1/4 inch guideline, builders contribute to safer construction practices and a reduction in trip hazards. This requirement is supported by OSHA regulations and industry standards that prioritize worker safety at construction sites.