What is the required curvature or bevel of nosings in stairways from the foremost projection of the tread?

The required curvature or bevel of nosings in stairways should generally conform to the guidelines that ensure safety and accessibility for users. The correct specification indicates that the bevel or curvature of nosings must have a range of 1/16" to 9/16" from the foremost projection of the tread.

This specification is crucial because it helps to prevent tripping hazards while providing enough surface area for users to safely place their feet on the step. The adequate curvature allows for smooth transitions between steps and enhances the overall usability of the staircase, making it compliant with building codes and safety guidelines.

Options presenting lower or higher ranges fail to meet the optimal balance of safety and accessibility defined in standard regulations. Maintaining a proper bevel is important not just for compliance reasons, but also for ensuring user safety and the functional integrity of the stairway design.