In the late 1970s, John Burt, a pool installer and the owner of Tri-City Vinyl, used a piece of thermoplastic material to patch a hole in the roof of his building, and the idea for his company was conceived. John Burt passed away in 2003, but his vision and philosophy continue to guide and inspire the employees at the company he founded 30 years ago - Duro-Last Roofing, Inc., headquartered in Saginaw, Mich.