In May 2007, the 75-year-old galvanized iron-roller-shingled roof on this historic home was covered in rust, despite four repaintings since 1977. Instead of repainting again, the owners contacted Statesville Roofing, Statesville, N.C., to preserve and sustain it. The roofing contracting company communicated with Rockford, Minn.- based supplier ER Systems Inc., a company that specializes in cool-roof restoration. Both companies agreed KynaKote was the product of choice because of its adhesion properties; color and gloss retention; mildew, chemical and dirt resistance; and stain repellence. During long-term exposure to sunlight, the surface becomes fluorine rich, which actually can improve surface properties with age.
Preparation was just as essential as the actual coating. Statesville Roofing grinded, sandblasted and washed the iron shingles to a clean, solid substrate. The crew also did a small amount of repair to ensure watertightness and system integrity. Once the system was brought to its original condition, a coat of Eraguard 2000 rust-inhibiting primer was installed at 4 to 6 dry mils. After it cured, two coats of KynaKote in hunter green were applied at 5 dry mils per sprayed application for a total of 10 dry mils. This restored roof can be sustained every 12 to 15 years with a simple rinse, inspection and additional coat.