Fortress Building Products 8-ft x 6-in Black Sand Steel JoistFortress Steel Joist 8 ft Black Sand The Fortress Building Products 8 ft x 6 in Black Sand Steel Joist is designed for durability and versatility, transforming any decking project into a low maintenance, long lasting success. With a robust steel construction that resists fire, rot, and insects, this joist provides a solid foundation that stays flat over time. Key Features: Versatile Compatibility: Accommodates composite, PVC, aluminum, tile, and wood