In residential settings, what is the maximum nosing protrusion for a tread depth of less than 11"?

In residential settings, when the tread depth is less than 11 inches, the maximum nosing protrusion allowed is indeed 1-1/4 inches. This measurement is established to ensure safety and accessibility in stair design, providing a sufficient edge that aids in visibility and usability while also promoting safe navigation of stairs.

A nosing that protrudes to this extent enhances the overall usability of stairs, particularly for individuals with mobility challenges. It provides a clear defining line to distinguish the edge of each step, which is crucial as it helps to prevent missteps.

The guidelines typically stipulate that if the tread depth is less than 11 inches, the nosing can extend up to 1-1/4 inches. Measurements that are shorter than this maximum, such as ½", ¾", or 1", would also be compliant but would not provide the maximum benefit in terms of visibility and safety. Understanding these standards is essential in both the planning and execution phases of residential construction and renovation, ensuring adherence to building codes and ultimately contributing to user safety.