Ontario Building Code Practice Exam

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

Labeled with a fire rating
Non-combustible materials
Minimum thickness of 50 mm
Continuous from floor to underside of roof sheathing

The correct answer is: Minimum thickness of 50 mm

A properly installed and labeled fire-rated column assembly in a commercial building must meet multiple requirements, including being made of non-combustible materials and being continuous from the floor to the underside of the roof sheathing. The minimum thickness of 50 mm, however, is not a specific requirement for a fire-rated column assembly. While thicker materials may contribute to fire resistance, it is not a definitive standard for the assembly. Therefore, option C is not a necessary requirement.