Is there a required minimum for the radius measurement of winder treads in curved stairways?

In the context of winder treads in curved stairways, building codes often dictate specific minimum radius measurements to ensure safety and usability. The correct answer indicates that the radius of the winder treads must be twice the width of the tread. This requirement aims to ensure that each tread provides adequate space for foot placement while navigating the curve, thus minimizing the risk of slips or falls.

This standard is particularly important since winder treads are typically used in situations where space is limited, and maintaining a safe and functional design is crucial. A radius that is twice the width of the tread helps maintain a comfortable turning space for users, allowing them to ascend or descend without compromising balance or safety.

Other options may suggest different ratios or the absence of any requirement, which would not align with the goal of promoting safe building practices through established codes. Adhering to the requirement of a radius measuring twice the width of the tread ensures that the design of curved stairways meets both safety and functionality standards.