Ontario Building Code Practice Exam 2026 – All-in-One Guide to Master the Code!

A requirement for a fire-rated enclosure in a commercial building is that it must be made of non-combustible materials, labeled with a fire rating, and continuous from floor to underside of roof sheathing. The minimum thickness of 50 mm is not a requirement for a fire-rated enclosure, making option D the correct answer. It is important for a fire-rated enclosure to be made of non-combustible materials to prevent the spread of fire, labeled with a fire rating for easy identification, and continuous from floor to roof to ensure complete containment of the fire. While a minimum thickness can contribute to the structural integrity and durability of the enclosure, it is not a necessary requirement.