On May 4, 2007, Greensburg, Kan., was hit by an EF5 tornado that ripped a 1.7-mile path of destruction through the town of about 800 residents. With winds that reached 205 miles per hour, the strongest tornado to hit the U.S. in eight years killed 11 people.
Thermoplastic polyolefin (TPO) single-ply
roofing membranes have an excellent history in commercial roofing; however they
are constructed using organic polymers that can be damaged by extreme heat,
sunlight and UV.