Roofing Materials and Systems Author:Underwriters Laboratories Inc. Roofing products and systems are tested and evaluated for fire-resistance and performance-related characteristics to the protection of building structures from weather-related events. For nearly a century, Underwriters Laboratories Inc. has worked with the roofing industry to develop standards that evaluate and measure distinct characteristics o... more »f the performance of roofing materials and systems with respect to fire safety and/or property protection. Adherance to manufacturer's recommended installation procedures and system details are fundamental considerations for optimal performance.« less