Using the 4-inch sphere rule, states that no opening be large enough to pass a 4-inch sphere (the head size of a small child) is permitted except: Other openings: On guards located on stairs shall not allow a4-3/8-inch sphere to pass.ĭeck balusters are required to be 4-inches apart or less.Triangular openings: On the stair, between the tread, riser, and bottom rail of the guard, shall not allow a 6-inch sphere to pass.The opening limitations should not allow a 4-inch diameter sphere to pass through except: The minimum height of guards is 36-inches above the walking surface or the line connecting the leading-edge treads. A stair that is more than 30-inches above grade, at any point, requires a guard along the full length of the openside. Guards are required along any open-sided walking surface, including stairs, ramps and landing, that are located more than 30-inchesvertically above grade at any point within 36-inches horizontally to the edge of the open side. Low-rise decks, not more than 30-inches above grade, are not required to have guardrails, although it is recommended. Commercial height requirement is 42-inches for multifamily, restaurant, and bar applications. The minimum height for a residential structure should be at least36-inches above a residential deck. Any perimeter greater than 6-1/4-inches shall have a graspable finger recess area on both sides. Noncircular handrails: For noncircular handrails, they shall have no less than a 4-inch perimeter anything greater and up to 6-1/4-inches shall have a 2-1/4-inch cross section.Circular handrails: For ease of grasping, circular handrails shall have no less than a 1-1/4-inch to 2-inchperimeter.Minimum hand clearance from the wall should be at least 1-1/2-inches for ease of grasping. Handrails need to be provided on at least one side of each continuous run of treads or flights with four or more risers at a height of 34-inches to 38-inches. and 9-in.) measured from the nose of the thread to the obstruction above floor, beam, coffered ceiling, etc.) RESIDENTIAL STAIRS – HANDRAILS AND GUARDS The IRC code also states that there must be an 80-inchclearance (6-ft. Anything further will crowd the throughway. Handrails should not project more than 4-1/2-inches from the wall. The treads, measuring front to back, must be at least10-inches deep. Stairs rails on decks should be between 34-inches and 38-inches high and are measured vertically from the nose of the tread to the top of the rail. STAIRS – HANDRAIL HEIGHT, WALLPROJECTION, AND CLEARANCES QUICK REFERENCE: The following is a quick reference guide for code specific deck guardrail and handrail minimum standards to meet for installation of a railing for both level and stair runs. Codes Cheat Sheet: Residential Railing and Decking
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