Ontario Building Code Practice Exam 2026 - Free Building Code Practice Questions and Study Guide

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What is the minimum height required for a guardrail on a stairway in a commercial building?

750 mm

850 mm

The minimum height required for a guardrail on a stairway in a commercial building is 850 mm. This is because building codes and regulations typically require a guardrail to be at least 42 inches high, which is equivalent to 1065 mm. Among the given options, only 850 mm meets this height requirement. Options A, C, and D are not correct as they fall below the minimum height requirement.

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950 mm

1050 mm

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