OSHA Office of Training & Education
9
Install between 30
and 50 degrees.
Must have uniform
riser height and
tread depth, with
less than a 1/4-inch
variation.
Uniform - 30 & 50 deg. angle
No more than 1/4 inch
variation in any stairway system
Stairs
Reference 1926.1052(a)(3) and (a)(2)