1910.25(d): Spiral stairs

(d) Spiral stairs. In addition to paragraph (b) of this section, the employer must ensure spiral stairs: 2 citations

(1) Have a minimum clear width of 26 inches (66 cm); 2 citations

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

(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 12 inches (30 cm) from the narrower edge;

(5) Have a uniform tread size;