Section 296-56-60217 - Spiral stairways(1) You must meet the following requirements for spiral stairways : (a) Stairways must conform to the minimum dimensions of Figure F-1; Figure F-1
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| Spiral Stairway Minimum Dimensions |
| A (Half-tread width) | B |
| Normal use by employees ...... | 11 inches (27.9 cm) | 6 inches (15.2 cm) |
| Limited access . . . | 9 inches (22.9 cm) | 5 inches (12.7 cm) |
(b) Stairway risers must be uniform and shall range from six and one-half to ten and one-half inches (16.5 to 26.67 cm) in height;(c) Minimum loading capability be one hundred pounds per square foot (445 N), and minimum tread center concentrated loading shall be three hundred pounds (1334 N);(d) Railing must conform to the requirements of WAC 296-56-60123(3). If balusters are used, there must be a minimum of one per tread. Handrails must be a minimum of one and one-fourth inches (3.18 cm) in outside diameter; and(e) Vertical clearance must be at least six feet, six inches (1.98 m) above the top step.(2) You must maintain spiral stairways in safe condition.Wash. Admin. Code § 296-56-60217
Amended by WSR 15-24-102, Filed 12/1/2015, effective 1/5/2016Statutory Authority: RCW 49.17.010, [49.17].040, and[49.17].050 . 00-21-103, § 296-56-60217, filed 10/18/00, effective 2/1/01. Statutory Authority: RCW 49.17.040. 99-02-024, § 296-56-60217, filed 12/30/98, effective 3/30/99. Statutory Authority: RCW 49.17.040 and 49.17.050. 86-03-064 (Order 86-02), § 296-56-60217, filed 1/17/86; 85-10-004 (Order 85-09), § 296-56-60217, filed 4/19/85; 85-01-022 (Order 84-24), § 296-56-60217, filed 12/11/84.