For stairways with solid risers in Group R-2 occupancies, what is the required nosing projection if the tread depth is less than 11 inches?

In Group R-2 occupancies, when dealing with solid risers and tread depths less than 11 inches, the required nosing projection is crucial for safety and functionality in stair design. The correct range of nosing projection, which is 3/4" to 1-1/4", is designed to provide an effective overhang beyond the riser that enhances the visibility and usability of each step. This range is in alignment with building code standards, which emphasize not only safety but also comfort as users navigate the stairs.

A nosing projection within this range helps increase the effective depth of the tread, providing a safer and more secure grip for users while minimizing the risk of trips and falls. This consideration is particularly important in residential occupancies where stairs are frequently used.

By ensuring that the nosing adheres to these specifications, the design promotes accessibility and safety, catering to a wide demographic including children, the elderly, and individuals with mobility challenges. Other options do not meet the recommended code requirements for this specific scenario of tread depth and may lead to unsafe conditions or non-compliance with building regulations.