296-56-60217 - Spiral stairways

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

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.

(Amended by WSR 15-24-102, Filed 12/1/2015, effective 1/5/2016)

Statutory 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.

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