Our Part 3 Large Buildings Classification and Construction course is a detailed technical course. This building code course focuses on large building classification and construction as outlined within Division B Part 3 of the Ontario Building Code. The curriculum covers separation of major occupancies; building area and height; streets, building size, and construction; occupant load; fire separations and fire-resistance ratings; firewalls; closures; fire stopping; provisions for firefighting; and mezzanines and interconnected floor spaces.