Ontario Building Code Practice Exam

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Which of the following is not a requirement for a fire-rated ceiling assembly in a commercial building?

Non-combustible materials
Labeled with a fire rating
Continuous from wall to wall
Minimum thickness of 50 mm

The correct answer is: Minimum thickness of 50 mm

A fire-rated ceiling assembly must meet the requirements of non-combustible materials, being labeled with a fire rating, and being continuous from wall to wall. This means that all options regarding the type of materials, labeling and continuity must be met in order for a ceiling assembly to be considered fire-rated. A minimum thickness of 50 mm, on the other hand, is not a specific requirement for a fire-rated ceiling assembly. It may be a recommended thickness for added fire resistance, but it is not a mandatory requirement. Therefore, option D is not a requirement for a fire-rated ceiling assembly in a commercial building.