Abstract: The present invention is directed to a method for making a molded roofing unit formed of a fiber-reinforced plastic composition. In a preferred embodiment, the method comprises forming a camber in the roofing unit. The method of the present invention provides consistent results in the molding process, low material and production costs, and produces a roofing product with high rigidity and strength, impact resistance, stability in high wind conditions, and which is easy to install.

Abstract: The present invention is directed to a molded roofing unit formed of a fiber-reinforced plastic composition configured to simulate the appearance of a conventional roofing product, such as a cedar shake, slate, or tile roofing product. The roofing product is configured to provide consistent results in the molding process, low material and production costs, high rigidity and strength, impact resistance, stability in high wind conditions, and ease of installation. In a preferred embodiment, the fiber-reinforced plastic composition is comprised of a polyolefin plastic compounded with at least partially delignified agricultural our forestry fibers. The roofing units possess high impact resistance, wind resistance and at least a Class C residential fire rating.