Certified Playground Safety Inspector (CPSI) Practice Exam 2025 – All-in-One Guide to Exam Success

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What is the minimum depth of the outer edge of the tread on spiral stairways for preschool-aged children?

5 inches

6 inches

7 inches

Spiral stairways are designed with a unique spiral pattern which decreases the available tread area. This means that the outer edge of the tread, which is the part closest to the outer edge of the stairway, may have a smaller depth compared to the center or inner edge of the tread. For preschool-aged children, it is important to have a larger outer edge depth to ensure their safety as they may not have developed enough motor skills to navigate the spiral stairs carefully. Therefore, the minimum depth of the outer edge of the tread on spiral stairways for preschool-aged children should be at least 7 inches. Options A, B, and D have depths that are not recommended for preschool-aged children as they may not provide enough support and stability.

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8 inches

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