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?

  1. Non-combustible materials

  2. Labeled with a fire rating

  3. Continuous from wall to wall

  4. Minimum thickness of 75 mm

The correct answer is: Minimum thickness of 75 mm

A and B are both requirements for a fire-rated ceiling assembly. Non-combustible materials are necessary to prevent the spread of fire, while a fire rating label ensures that the ceiling has been tested and approved for its level of fire resistance. C is also a requirement, as any gaps or breaks in the ceiling can compromise its fire protection capabilities. Therefore, D is the only incorrect option as there is no minimum thickness requirement for a fire-rated ceiling assembly.

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