What is the maximum riser height for all new construction exit stairs?

The maximum riser height for all new construction exit stairs, as specified by building codes, is 180 mm. This measurement is established to ensure safety and accessibility for users. The rationale behind this height limit is that it helps to prevent trip hazards and allows for easier navigation up and down the stairs. Ramps and stairs are designed to facilitate safe movement, and excessive riser heights can increase the effort needed to ascend and descend, particularly for individuals with mobility challenges.

In many jurisdictions, the maximum riser height ensures compliance with accessibility standards, like those set out in the International Building Code (IBC) or similar regulations. By adhering to this limit, builders can create a safer environment that minimizes risks associated with stair use.

The other options present heights that exceed this maximum, which could lead to unsafe stair designs and more significant liability for builders and designers if accidents occur.