In stairways, what is the minimum required riser height in Group R-3 occupancies?

In Group R-3 occupancies, which typically include residential buildings like single-family homes or duplexes, the minimum required riser height is 7-3/4 inches. This requirement is established to ensure safety and accessibility for occupants, particularly in residential environments where ease of use is essential.

Having a maximum riser height standard helps to reduce the risk of trips and falls, supporting a more comfortable ascent and descent of the stairs. If the riser were allowed to be shorter, it could potentially lead to a less stable stairway, increasing the likelihood of accidents. On the other hand, a riser height that is too tall could also pose significant challenges, particularly for individuals with limited mobility, children, or the elderly.

By adhering to the 7-3/4 inch minimum, the design of stairways in Group R-3 occupancies balances functional usability with safety requirements, which is a primary goal of building codes.