Wash. Admin. Code § 296-24-74020 - Spiral stairs

In addition to WAC-296-24-74005, you must also ensure spiral stairs:

(1) Have a minimum clear width of 26 inches (66 cm);

(2) Have a maximum riser height of 9.5 inches (24 cm);

(3) Have a minimum headroom above spiral stair treads of at least 6 feet 6 inches (2 m), measured from the leading edge of the tread;

(4) Have a minimum tread depth of 7.5 inches (19 cm), measured at a point of 12 inches (30 cm) from the narrower edge; and

(5) Have a uniform tread size.

Notes

Wash. Admin. Code § 296-24-74020

Amended by WSR 15-24-100, Filed 12/1/2015, effective 1/5/2016 Decodified by, Filed 4/21/2020, effective WSR 20-09-146 10/1/2020. Recodified from § 296-24-76515.

Order 73-5, § 296-24-76515, filed 5/9/73 and Order 73-4, § 296-24-76515, filed 5/7/73.