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Code of Federal Regulations Title 29. Labor § 29.1917.121 Spiral stairways
Current as of January 02, 2025 | Updated by Findlaw Staff
(a) Definition. “Spiral stairway” means one with closed circular form, uniform sector-shaped treads and a supporting column.
(b) Requirements. Spiral stairways shall meet the following requirements:
(1) Stairways shall conform to the minimum dimensions of Figure F–1;
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SPIRAL STAIRWAY—MINIMUM DIMENSIONS |
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|---|---|---|
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A (half-tread width)
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B |
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Normal use by employees․․․․․․․․․․․․․․
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11 inches (27.94 cm) |
6 inches (15.24 cm). |
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Limited access․․․․․․․․․․․․․․․․․․․․․․․ |
9 inches (22.86 cm) |
5 inches (12.7 cm). |
(2) Stairway risers shall be uniform and shall range from 6 1/2 to 10 1/2 inches (16.5 to 26.67 cm) in height;
(3) Minimum loading capability shall be 100 pounds per square foot (4.79 kN), and minimum tread center concentrated loading shall be 300 pounds (1334 N);
(4) Railings shall conform to the requirements of § 1917.112(c)(1). If balusters are used, there shall be a minimum of one per tread. Handrails shall be a minimum of 1 1/4 inches (3.18 cm) in outside diameter; and
(5) Vertical clearance shall be at least 6 feet, 6 inches (1.98 m) above the top step.
(c) Maintenance. Spiral stairways shall be maintained in safe condition.
Cite this article: FindLaw.com - Code of Federal Regulations Title 29. Labor § 29.1917.121 Spiral stairways - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-29-labor/cfr-sect-29-1917-121/
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