DECRA Metal Roofing products are manufactured at our state-of-the-art facility in California but our proprietary stone-coating manufacturing process has an illustrious history that dates back to World War II. An emulsion coating derived from road tar and stone chips was first developed by the Decraspray Company in wartime England to camouflage the reflective corrugated metal roofs of important storage buildings and protect them from German air raids. After the war, the DECRA coating had bonded so well that it was virtually unremovable from the underlying corrugated iron. The coated metal roofs were so well-preserved that many began to see the incredible potential for creating a new standard of durable roofing products. The original DECRA formula has been improved with an advanced acrylic base which has set the gold standard for durability and longevity.