For solid risers in Group R-2 occupancies, what is the minimum nosing projection required?

In Group R-2 occupancies, which typically include multi-family residential buildings, the requirements for stair design must address both safety and accessibility. The correct minimum nosing projection of 3/4" to 1-1/4" is critical because it ensures that users have a sufficient edge to step onto when using the stairs, thereby reducing the risk of slips and falls.

This specific range is designed to enhance visibility and the usability of the stairs, particularly for people of varying abilities, while also complying with the building codes related to egress. Proper nosing projection enhances the safety of stairways by ensuring a consistent feel for those ascending or descending, which is crucial in environments where individuals may be moving quickly or under duress.

In contrast, if the nosing projection were less than 3/4" or greater than 1-1/4", it could compromise the intended functionality and safety of the stair design, potentially leading to increased hazards for occupants. Therefore, maintaining this standard is essential for the overall integrity and safety of stairways in Group R-2 structures.