In stair design, what is the term ‘tread’ referring to?

In stair design, the term 'tread' specifically refers to the horizontal part of the step where a person places their foot when ascending or descending the stairs. It provides the surface area needed for safe footing and is crucial for ensuring stability and comfort when using the stairs.

Having an appropriately sized tread is essential for a well-designed staircase, as it affects the overall usability and safety. Treads must be designed with proper depth to accommodate users effectively, which helps to prevent slips and falls. The other elements of the stair, such as the riser (the vertical part), the angled part (which is related to the slope of the stairs), and the landing (a flat area at the top or bottom of the stairway), all serve important functions but are distinctively different from the tread itself. Understanding these components is vital in carpentry and building construction, ensuring the design meets both aesthetic and safety standards.