Osha 1910.25(c)(2) requires standard stairs to have a maximum riser height of 9.5 inches (24 cm). Ibc 1011.5. 2 requires that stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum.
How High Can a Step Be?
Step height is an important consideration for any staircase or ramp. If the steps are too high, they can be difficult and dangerous to use, leading to injury or falls. On the other hand, if the steps are too low, they can be uncomfortable and inefficient to use. Therefore, it is important to consider the ideal step height for a given application.
The ideal step height is generally considered to be between 6-7 inches (15-18 cm). This is a good compromise between comfort, efficiency, and safety. With this height, the user can easily place their feet on the step without having to strain their muscles or raise their center of gravity too far. It is also low enough that it is unlikely to cause injury in the event of a fall.
For outdoor applications, such as ramps or staircases, the ideal step height is slightly higher than the 6-7 inches mentioned above. This is due to the fact that outdoor surfaces are often uneven and the user needs to be able to adjust their foot placement to account for the unevenness. Therefore, the ideal step height for outdoor applications is generally 8-9 inches (20-23 cm).
The maximum step height is largely determined by local building codes. Generally, the maximum step height is