What is the minimum tread required on an exterior masonry step?

The minimum tread required on an exterior masonry step is essential for ensuring safety and comfort. A tread of 12 inches provides sufficient space for a foot to land comfortably, reducing the risk of tripping and enhancing stability when ascending or descending the steps. The 12-inch measurement allows a user to place their entire foot securely on the step, especially in outdoor conditions where surfaces may be wet or uneven.

In construction and building codes, treads must accommodate a variety of foot sizes and ensure that users can navigate the steps without difficulty, particularly when carrying items or in situations where visibility may be limited. Steps that are too narrow do not provide adequate safety and can lead to accidents. Therefore, 12 inches is the standardized minimum for exterior masonry steps to promote both practicality and safety in design.