According to the 2021 International Residential Code, what is the minimum tread depth for non-spiral stairs?

The minimum tread depth for non-spiral stairs, as specified in the 2021 International Residential Code, is 10 inches. This requirement is in place to ensure safety and usability, providing enough surface area for the foot to rest securely while ascending or descending the stairs. A tread depth of 10 inches strikes a balance between comfort and safety, reducing the risk of slips and falls, especially for individuals who may not have steady footing. Additionally, proper tread depth contributes to uniformity in stair design, which is crucial in both residential and commercial settings.