Cornell Roofing & Sheet Metal was established in Kansas City in 1927. Cornell crews had a hand in building the Kansas City skyline and continue to do so to this day. Mary McNamara joined the company in 2006, purchasing Cornell in 2007. The roofing industry is in Mary’s blood, with three generations of McNamara’s (beginning with Mary’s father and uncle) setting the bar for leadership in the industry. With Mary at the helm and the support of a dedicated, highly skilled team, Cornell Roofing and Sheet Metal has grown by over 250% and continues to break records as they approach 100 years in business.


Cornell Roofing and Sheet Metal will consistently deliver the highest quality commercial roofing and sheet metal products and services in the Kansas City region. We will continue to build strong customer and supplier relationships, responsibly advocate for our associates by fostering a positive and safe work environment and support our community while continuing to profitably expand our business.


Cornell Roofing & Sheet Metal evisions becoming the premier commercial roofing and sheet metal company in the greater Kansas City region. We will achieve this by differentiating ourselves from our competition through continual innovation and training, profitably expanding the size and scope of our projects and services. We will remain committed to operating with integrity with all associates, customers and suppliers and become a leading voice in our industry for civic outreach and community involvement.

Core Principles

Cornell Roofing & Sheet Metal will…..
• Operate with integrity with all customers and suppliers.
• Offer opportunities for growth and development to our associates.
• Deliver top quality products and services to the marketplace.
• Develop strong community and civic outreach.
• Build a strong and profitable company.