What is the minimal tread depth for standard stairs?

The minimal tread depth for standard stairs is 10 inches. This measurement is crucial for ensuring safety and comfort when using stairs. A tread depth of at least 10 inches provides enough space for a person's foot to securely rest on the step without the risk of slipping or missing the step entirely during ascent or descent. This standard is widely accepted in building codes and establishes a guideline for the construction of safe stairways.

Tread depth is important not only for accessibility but also for preventing accidents. A depth that is less than 10 inches can lead to discomfort and increases the chance of missteps, particularly for individuals with mobility issues or those carrying objects. Therefore, adhering to a minimum tread depth of 10 inches is essential for the design and safety of stairways.