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: 1000 mm

A guardrail is a protective barrier that is required on roofs in commercial buildings to prevent falls and ensure safety. The minimum height for a guardrail is determined based on the roof's slope and pitch, as well as the height of the building. Option A, 900 mm, may be too low and not provide adequate protection. Option C, 1100 mm, may also be too low for a commercial building and could potentially still present a fall hazard. Option D, 1200 mm, may be an appropriate height for a guardrail, but it is not the minimum requirement. Therefore, the correct answer is B, 1000 mm, as it meets the minimum height requirement while also providing appropriate fall protection for a commercial building roof.