According to CFR 1910.23, a “standard stair railing” (stair
rail) shall be of construction similar to a standard railing, but the
vertical height shall not be more than 34 inches nor less than 30 inches from the upper
surface of the top rail to the tread surface in line with the face of the riser at the forward edge of the tread.
A “standard handrail” consists of a lengthwise member mounted directly on a wall
or partition by means of brackets attached to the lower side of the handrail in order to
keep a smooth, unobstructed surface along the top and both sides of the handrail. Brackets
shall hold the rail 3 inches from the wall and be no more than 8 feet apart.
The height of handrails shall be no more than 34 inches nor less than 30 inches from the
upper surface of the handrail to the surface of the tread in line with the face of the
riser or to the surface of the ramp. Winding stairs shall have a handrail that is offset
to prevent people from walking on any portion of the treads where the width is less than 6
inches.
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