Ontario Building Code Practice Exam

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Which of the following is not a requirement for a fire-rated wall assembly in a high-rise building?

Non-combustible materials
Labeled with a fire rating
Continuous from floor to underside of roof sheathing
Minimum thickness of 75 mm

The correct answer is: Minimum thickness of 75 mm

A fire-rated wall assembly in a high-rise building must meet certain requirements in order to contain and prevent the spread of fire. These requirements include using non-combustible materials (A), labeling the assembly with a fire rating (B), and ensuring that it is continuous from the floor to the underside of the roof sheathing (C). Therefore, the incorrect answer is D, as a minimum thickness of 75 mm is not a specific requirement for a fire-rated wall assembly in a high-rise building. However, it is important to note that the thickness of the wall may affect its fire resistance, but it is not a specific requirement.