This spiral staircase is a custom, 55' tall, multi level, fire escape stairway for a commercial building. The stair is 60" in diameter and uses 30 degree treads. Handrail is a # 220 (1 15/16" wide) molded bronze cap rail with alternating balusters of # 314 (1/2" square with a twist) & # 318 (1/2" square with a twist), and a casting every other baluster. The treads are a # 110 (12 gauge) checker plate steel. The center column is 3 1/2" round schedule 40 pipe.
These spiral stairs can have multiple custom landings with a heavy duty MC 6x12.0 channel frame, and a 19W4 bar grate overlay. These landings have guard rails and balusters to match the stair. The spiral stair was assembled in one unit and splice for shipping and welded together at the job site. The handrails on the spiral stair and landings have a mirror finish, and the stairway was finished with a red oxide primer. The finish paint was applied at the job site by others.