Fortress Building Products 8-ft x 6-in Black Sand Steel Joist8 ft Black Sand Steel Joist The Fortress Evolution Steel Joist is a robust and sustainable choice for deck framing, offering a sleek black sand finish that combines aesthetics with functionality. Crafted from durable, recyclable steel, this joist is designed for long lasting performance, resisting fire, rot, and insect damage while maintaining a flat and stable frame for any decking material. Key Features: Versatile Compatibility: Supports any decking