SAGINAW, Mich. — Duro-Last Inc., the world's largest manufacturer of custom-fabricated single-ply roofing systems, celebrated its 40th Anniversary with a May 16 open house at company headquarters in Saginaw, Mich.

More than 100 guests attended the event – including local contractors, community members and organizations, and vendor partners – and had the opportunity to tour the Duro-Last, EXCEPTIONAL® Metals and Plastatech® Engineering manufacturing facilities.

Guests were invited to explore Duro-Last’s unique history through interactive timelines and hands-on product demonstrations.

Duro-Last leaders and board members, including Mrs. Burt, widow to Duro-Last founder John R. Burt, were also on hand during the open house to greet guests and answer questions. Additionally, representatives from each of the John R. Burt family of companies showcased information about their products and operations.

“John R. Burt established a culture of innovation and excellence when he manufactured the first Duro-Last roof in 1978,” said Duro-Last CEO Tom Saeli. “What started as a small manufacturer of PVC pool liners has grown into a leader in the commercial roofing industry. All of us at Duro-Last are proud of the accomplishments we have achieved with our network of dedicated contractor partners across the country, and are excited to share this important milestone with them.”

Known as the “World’s Best Roof®”, Duro-Last is the world's largest manufacturer of custom-fabricated, thermoplastic single-ply roofing systems.

According to the company, factory-controlled custom-fabrication can eliminate up to 85 percent of field seams, resulting in lower on-site labor costs and easier installation. Duro-Last’s roofing systems are sustainable and durable. More than 2 billion square feet of Duro-Last membrane has been installed throughout North America.

In addition to the company’s Saginaw headquarters, Duro-Last has additional manufacturing facilities in Grants Pass, Ore.; Jackson, Miss.; Sigourney, Iowa; Carrollton, Texas; and Ludlow, Mass.

“While our business and product offerings continue to grow, we remain committed to the entrepreneurial spirit and drive that we began this journey with,” said Jack Burt, Duro-Last chairman of the board, and son of John R. Burt. “It’s been an honor to carry on my father’s legacy and continue our tradition of a family-owned operation.”

Duro-Last is honoring the theme of “40 Years at the Top” all year long with special activities for employees and contractors.

For more information about the history of Duro-Last and the John R. Burt family of companies, visit