What is the tread depth required for stairways according to established codes?

The required tread depth for stairways according to established codes is 11 inches. This measurement is specified to ensure safety and comfort while using the stairs. A deeper tread allows for more secure footing, reducing the risk of slips and falls, which is critical in emergency situations where safe egress is necessary.

The established codes recognize that consistent and adequate tread depth plays a significant role in the overall usability and safety of stairways. Therefore, when designing or evaluating staircase designs, adhering to this requirement is essential for compliance with safety regulations. Understanding these measurements is crucial for fire plans examiners, as they have to ensure that stairways can sustain safe evacuation routes in case of fire emergencies.