Ontario Building Code Practice Exam

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

1. 900 mm

2. 1000 mm

3. 1100 mm

4. 1200 mm

The correct answer is: 900 mm

The minimum height required for a guardrail on a roof in a commercial building is 900 mm. This is because it is the industry standard for safety and recommended by most building codes and regulations. Option B, C, and D are all incorrect as they suggest a greater height requirement, which may make it difficult for workers to access the roof or for equipment to be moved onto it.