Ontario Building Code Practice Exam

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

Non-combustible materials
Labeled with a fire rating
Continuous from floor to underside of roof sheathing
Minimum thickness of 100 mm

The correct answer is: Minimum thickness of 100 mm

A minimum thickness of 100 mm is not a requirement for fire-rated wall assemblies in a commercial building. This is because fire-rated walls are defined by their ability to withstand fire for a designated time, not by their thickness. The other options, including non-combustible materials, a labeled fire rating, and continuous construction from floor to roof, are all important elements in a fire-rated wall assembly as they contribute to its fire resistance and help contain and prevent the spread of fire.