More than 100 years after it was founded, Olsson Roofing Company is still known for integrity, continuous improvement, customer service, and professionalism. With two locations, and more than 200 annual projects spanning the Midwest, Olsson Roofing Company has earned recognition as the largest commercial roofing company in the state of Illinois. We specialize in the maintenance, installation, and repair of commercial and industrial roofing systems, and architectural sheet metal.