What is the maximum riser height permitted for stairs according to the IRC?

The International Residential Code (IRC) allows for a maximum riser height of 7¾ inches for stairs. This measurement is important because it helps ensure safety and consistency in stair design. A riser height of 7¾ inches strikes a balance between being high enough to provide practicality for ascent and descent while also limiting fatigue or missteps that can occur with taller risers. Furthermore, maintaining this standard aids in creating a uniform step height throughout the staircase, enhancing overall safety and usability.

When stair risers exceed this height, there is an increased risk of tripping and difficulty in navigating the stairs, especially for children, the elderly, and individuals with mobility impairments. Therefore, the IRC specifically sets this limit to promote accessible and safe stair construction in residential buildings.