What are the building code requirements for a handrail at stairs?
Thursday, July 18, 2019
A handrail is defined by the International Residential Code (IRC) and the Residential Edition of the Florida Building Code (FBC) as “a horizontal or sloping rail intended for grasping by the hand for guidance or support." It must be easy to grab and hold onto to prevent a fall, particularly on stairs. A handrail is not the same as a guardrail, which is intended to protect a person from falling through it, but may be attached to one.
Here’s a summary of the handrail requirements found at R311.7.8 of the International Residential Code (IRC) and the Residential Edition of the Florida Building Code (FBC):
• A handrail is required when there are 4 or more risers (3 treads).
• Handrail height must be 34 to 38 inches high, measured from the tread nosing or ramp surface, with two exceptions allowed: 1) a volute (shown below) is allowed over the lowest tread, and 2) the transition from handrail to guard, or at the start of a stair flight, my exceed 38 inches.
• Handrail should be continuous for the full length of the stair flight, from above the highest riser to above the lowest riser, but can be interrupted by a newel post.
• Handrails ends should be returned to the wall or terminate at newel post or safety terminal.
• Handrails next to a wall must have a minimum of 1.5 inches between wall and handrail.
• A round handrail diameter must be between 1.25 and 2 inches. If handrail is not round, the perimeter should be between 4 and 6.25 inches, and have edges slightly rounded with a diameter of at least 1/100th of an inch.
• Handrails with a perimeter of more than 6.25 inches must have a finger-grippable recess on both sides. The requirements for the shape and recess are very specific: "The finger recess shall begin within a distance of 3/4 inch (19mm) measured vertically from the tallest portion of the profile and achieve a depth of not less than 5/16 inch (8 mm) within 7/8 inch (22 mm) below depth shall continue for not less than 3/8 inch (10mm) to a level that is not less than 1-3/4 inches (45mm) below the tallest portion of the profile. The width of the handrail above the recess shall be not less than 1-1/4 inches (32 mm) and not more than 2 3/4 inches (70 mm). Edges shall have a radius of not less than 0.01 inch (0.25 mm)."
Here’s some examples of both acceptable and rejected handrail profiles from the folks at Code Check®.
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