FTS International,™ Cisco, Texas, Fort Worth, Texas, is a leading independent provider of well stimulation services for the U.S. oil and gas industry. Throughout the years, FTS International's chemical manufacturing and storage facility in Chickasha, Okla., received several building additions. Although joined together, the additions were in many respects several buildings adjacent to one another with just a small gap between them, resulting in extensive drainage issues. The additions' existing standing-seam metal roof panels also were rusting, causing additional leaks. Some roof areas that had been coated also experienced leaks.

Tradition Roofing, Richmond, Texas, installed Mule-Hide Products® Co. Inc.'s 45-mil-thick white TPO membrane over the existing 3,500 squares of standing-seam metal panels. Up to 3 inches of flute-fill insulation was used to level the existing metal roof, and 1/2-inch-thick foil insulation was placed between the flute-fill insulation and TPO membrane.

Because the buildings are in Oklahoma where strong storms are common, wind resistance was a key consideration. Rather than fastening the TPO membrane to the metal panels, the membrane was fastened to the metal purlins that support the roof panels. The purlins were spaced 10 feet apart, requiring use of 12-foot-wide TPO rolls rather than the typical 10-foot-wide rolls. Fasteners also were spaced 6 inches apart, rather than 12 inches, to provide additional wind resistance.

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