Ontario Building Code Practice Exam

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

Non-combustible materials
Labeled with a fire rating
Continuous from wall to wall
Minimum thickness of 75 mm

The correct answer is: Minimum thickness of 75 mm

A fire-rated ceiling assembly in an industrial building must have non-combustible materials, be labeled with a fire rating, and be continuous from wall to wall. However, a minimum thickness of 75 mm is not a requirement. This thickness may be necessary for certain fire ratings, but it is not a universal requirement for all fire-rated ceilings in industrial buildings. Therefore, option D is not a necessary requirement for a fire-rated ceiling assembly in an industrial building.