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Standard Construction Details Handrails and Guardrails IRC 311.5.8 <br /> <br /> <br /> <br />Open Stair Guardrail Open Guardrail Solid Guardrail <br /> <br /> <br /> <br />Solid Stair GuardrailB <br /> <br /> <br />36” minimum guardrail height <br />B <br />for dwelling units, 42” minimum <br /> <br />for commercial and common <br />C <br />areas of multi-family residential. <br />Top of guardrail for <br />stairways, except at <br /> <br />landings, may have B <br /> <br /> <br />A height as required <br /> <br />Railing Opening Limits: <br />for handrails (34”-38”) <br />A <br /> <br />Stair landing or floor level <br /> <br />A – A 6” diameter sphere can’t <br /> <br /> <br />pass through. <br /> <br />B – A 4” diameter sphere <br />Guardrail required at <br />can’t pass through. <br />heights over 30” <br /> <br />C – A 4-3/8” diameter sphere <br /> <br />can’t pass through <br /> <br />(at sides of stair treads) <br /> <br />Grade or floor level <br /> <br /> <br /> <br /> <br /> <br /> <br />1-1/4” minimum – 2-1/4” maximum <br />Handrail extensions are required on commercial <br /> <br />and common areas of multi-family buildings. The <br /> <br />extension length shall be at least 12” horizontally <br />12” <br />beyond the top riser and shall continue <br />to slope for the depth of one tread <br />beyond the bottom riser. <br /> <br /> <br />Typical Handrail Shapes <br /> <br /> <br /> <br /> <br />B <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />A <br /> <br />34”-38” <br /> <br />Residential handrails <br /> <br /> <br />must return to the wall <br /> <br />or terminate in a <br /> <br /> <br /> baluster or post at <br />each end <br /> <br />1-1/2” min. min. clearance <br />A <br /> <br /> <br /> <br /> <br /> <br /> <br />Handrail may project a <br /> <br /> <br />B <br />max. of 4-1/2” into <br /> <br /> <br />required width of stairs <br /> <br /> <br /> <br /> <br /> <br />Termination <br /> <br />Wall Clearance <br />Handrail Height and Extensions <br /> <br />The County of Hawai‘i is an Equal Opportunity Provider and Employer <br /> <br /> <br />101 Pauahi Street, Suite 107 74-5044 Ane Keohoklole Hwy <br />ā <br />Hilo, Hawai‘i 96720 Kailua-Kona, Hawai’i 96740 <br /> <br />Tel: (808) 961-8331 Page 26 Tel: (808) 323-4720 <br /> <br />