Ontario Building Code Practice Exam

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

The other options listed (A, B, and C) are all requirements for a fire-rated wall assembly in an industrial building. A fire-rated wall must be constructed with non-combustible materials to prevent the spread of fire. It must also be labeled with a fire rating to indicate its level of fire resistance. Additionally, the wall must be continuous from the floor to the underside of the roof sheathing to ensure that there are no gaps or breaks that could allow fire to spread. A minimum thickness of 75 mm is not a requirement for a fire-rated wall assembly in an industrial building, as the thickness of the wall depends on the specific fire resistance rating needed for the building.