Here is a barn staircase I designed and built myself. I completed it on January 27 of 2023. It consists of four sets of stairs, 12 stringers, and three cantilevered landings spanning two floors. Due to expansive soils in the area, the entire staircase floats off of beams that have load paths down 35 feet to bedrock. The bottom stairs are designed to give if the slab moves. Material is steel, LVL, LSL and Advantek. It is ready for steel railings and oak treads.