Massachusetts Unrestricted Construction Supervisor License Practice Test

What is the maximum amount the greatest riser can deviate from the smallest riser on a flight of stairs in an apartment building?

1. 1 inch

2. 1/2 inch

3. 3/8 inch

4. 1/4 inch

The correct answer is: 3/8 inch

The maximum allowable deviation between the greatest riser and the smallest riser in a flight of stairs is set at 3/8 inch to ensure safety and comfort for users. This standard is based on the concept of consistency in stair dimensions, which is crucial for preventing tripping hazards. When the risers are uniform in height, users can maintain a steady rhythm while ascending or descending, minimizing the risk of missteps, especially in a residential context like an apartment building where daily foot traffic is expected. If the maximum deviation were larger than 3/8 inch, it could lead to increased risk of accidents as individuals would have to adjust their steps more frequently, which is particularly concerning in emergency situations where quick exit may be necessary. In contrast, stricter limitations such as 1/4 inch would further enhance safety, but 3/8 inch remains the accepted maximum deviation that balances practical construction considerations with user safety.