3303.6.1 Required ladders and shields.
BC § 3303.6.1
The escape hatch shall be constructed with at least two fixed, vertical ladders enclosed in a solid non-combustible shield. The ladders shall extend from a distance of 3 feet (914 mm) above the floor where the concrete is being placed to at least the story below the heating floor, or to the ground floor, whichever is less. The solid non-combustible shield shall enclose the ladders on all sides from the top of the floor where the concrete is being placed to at least the top of the heating floor. The inside dimensions between faces of the shield shall be not less than 3 feet 8 inches (1118 mm). Exception: Extension ladders may be utilized where the horizontal dimension between the faces of the shields is equal to or greater than one-quarter the height of the shaft.
