In Group R-2 occupancies, what is the minimum tread depth of stairs?

In Group R-2 occupancies, which include residential buildings with multiple dwellings such as apartment buildings, the minimum tread depth for stairs is specified to be at least 11 inches according to the International Building Code (IBC) requirements. This dimension is critical for ensuring safety and accessibility, as it provides adequate space for occupants to place their entire foot on each step, reducing the risk of slipping and falls.

The minimum tread depth helps to create a comfortable and secure footing when ascending or descending stairs, catering to the varying needs of occupants, including children, elderly residents, and individuals with disabilities. By establishing a minimum depth, building codes strive to promote uniformity and safety across different buildings and types of staircases, enhancing the overall structural integrity and usability of stairways.

Thus, the requirement for a tread depth of 11 inches is vital in maintaining safety standards in Group R-2 occupancies.