What is the minimum depth of a stair tread according to PD 1096?

In the context of PD 1096, which pertains to the National Building Code of the Philippines, the minimum depth of a stair tread is specified to be 250 mm. This dimension is essential for ensuring safety and comfort when using stairs, as it provides adequate space for feet to land securely and helps to reduce the risk of slipping or tripping.

A tread depth of 250 mm is designed to accommodate various foot sizes, allowing for a stable footing. This standard is particularly important in public and commercial buildings where stair usage is high, aiming to promote accessibility for all individuals. Adequate tread depth contributes to the overall safety of staircase design, ensuring that users have enough space to navigate stairs without confusion or hazard.

In contrast, the other provided options do not meet the minimum requirements set forth in PD 1096. A tread depth of 200 mm, 225 mm, or 300 mm may either fall short of safety standards or be unnecessary, given that 250 mm is established as the baseline for safety and usability in stair construction. The importance of adhering to these specifications cannot be overstated, as they are intended to safeguard the well-being of individuals using the stairs.