A stair run refers to the horizontal distance a staircase covers, including all treads but typically excluding the landings. Related, the height of the staircase is the stair rise.
Yes, improper measurements can lead to unsafe stairways, increasing the risk of tripping or falling.
Compliance Details
OSHA Compliance:
OSHA 1910.25: This standard outlines stairway requirements, including dimensions for treads and risers, and mandates that stairways must be uniform in height and depth within each flight. OSHA-compliant stairs must also have slip-resistant surfaces and adequate headroom.
- Riser Height: Must be uniform, not exceeding 9.5 inches.
- Tread Depth: Should be at least 9.5 inches.
- Width: Minimum clear width must be 22 inches between vertical barriers.
IBC Compliance:
International Building Code (IBC): Sets requirements for stairways used in public buildings, focusing on safety, accessibility, and durability. IBC standards are often more stringent than OSHA for stairs used in commercial and public settings. More on IBC compliance
- Riser Height: Typically should not exceed 7 inches.
- Tread Depth: Minimum depth is usually 11 inches.
- Width: Minimum width should be 36 inches.
- Handrails: Must be provided on both sides of the stairway and meet specific height and graspability standards.
- Landing Requirements: Landings must be provided at the top and bottom of every stairway and at any point where the stairway changes direction.
