What is the common required depth of treads for commercial construction?

The common required depth of treads for commercial construction is typically 11 inches. This dimension is established to ensure safety and accessibility for users, providing ample space for the foot to step securely on each step. The 11-inch tread depth is a standard that balances safety and comfort, making it less likely for someone to slip or misstep when ascending or descending the stairs.

In commercial settings, adhering to this depth is critical as it contributes to meeting building codes and regulations, which are designed to promote safety and usability in public spaces. Insufficient tread depth can lead to increased risk of accidents and non-compliance with the Americans with Disabilities Act (ADA) requirements, which emphasize accessibility features in buildings.