The UL Fire Resistance Directory is an annual publication that provides a comprehensive listing of fire-resistant materials and assemblies that have been tested and certified by UL. The directory includes:

In 2017, the directory wasn't just a list of products; it was the definitive source for:

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: The UL Fire Resistance Directory (also known as the "Orange Book") contains UL-certified fire-resistive assemblies (walls, columns, floors, roofs) and their construction details (e.g., steel studs, gypsum board thickness, insulation).