What is the minimum tread depth required for stairways in single-family dwellings?

The minimum tread depth required for stairways in single-family dwellings is 10 inches. This dimension is critical for ensuring safety and comfort when using stairs. Adequate tread depth allows individuals to securely place their foot on the step, reducing the risk of slipping and falling. It also helps in maintaining a uniformity that is essential for anticipating the distance one needs to step down or up, which is particularly important in residential settings where varied usage may occur.

Building codes typically stipulate different requirements based on the type of occupancy, but for single-family dwellings, a tread depth of 10 inches strikes a balance between safety and functionality. A shallower tread might not provide enough space for an adult's foot, thus increasing the chance of missteps. Therefore, adhering to this minimum dimension is an essential aspect of stair design.