Exterior spiral staircase for commercial buildings (metal frame and steps)
This multilevel stairway reaches three stories on a diving platform. A special landing has been added on the first level allowing access to a second stairway reaching an additional diving platform.
The stairs are 60" diameter with 30 degree, 12 gauge, steel pan type treads with a cool deck inlay. The landings are made of 12 gauge pan steel with reinforcing braces and a cool deck inlay.
Each tread has two 1" square balusters ant the handrail is 1 1/2" round steel. Because of the height of the stairway, a heavy duty center column was constructed using 3 1/2" I D schedule 80 round pipe. The factory finish is a galvanize coating and was painted Blue at the job site.