Hiring a professional roofing contractor is important because a new roof represents a major investment and protects a building and its contents. The Ontario Industrial Roofing Contractors Association (OIRCA) provides pre-qualified professional roofing contractors who have undergone a thorough evaluation process and meet specific criteria. OIRCA members install the majority of industrial, commercial, and institutional roofs in Ontario and take pride in their work, issuing a two-year warranty on installations.