Stair handrail profile types A, B, C, and D appear alongside non-circular cross sections with specific dimensional clearances and mounting heights. Handrails are positioned thirty-four to thirty-eight inches above the stair nosing with a minimum one-and-one-half-inch clear space to the adjacent wall. Non-circular cross sections feature perimeters ranging from four inches minimum to six and one-quarter inches maximum, with rounded corners maintaining a minimum one-eighth-inch radius. Additional profiles include recessed handrail conditions and bracket mounting configurations.
NOTE: 1. MOUNTING HEIGHT IS 34"-38" TO TOP OF GRIPPING SURFACE ABOVE STAIR NOSINGS. 2. SURFACE OF HANDRAIL SHALL BE SMOOTH WITH NO SHARP EDGES. 3. EDGES OF HANDRAILS HAVE A MINIMUM RADIUS OF 1/8" AND NOT ROTATE WITHIN FITTINGS CLEAR 1 1/2" MIN 1 1/2" MIN 3" MAX. 18" MIN. MAX 1 1/2" TO SUIT MIN 1 1/2" 2" MAX 1 1/4" MIN 2 1/4" MAX 2" MAX HANDRAIL NON-CIRCULAR CROSS SECTION NOTE: AT TYPE 2 AND 3: 4" MIN. - 6 1/4" MAX PERIMETER TYPE (A) 34"-38" ABOVE STAIR NOSING CLEAR 1 1/2" MIN 1 1/4" MIN - 34"-38" ABOVE STAIR NOSING 34"-38" ABOVE STAIR NOSING 2" MAX. 1 1/4" MIN - 2" MAX. 1 1/2" CLEAR 1 1/4" MIN - 2" MAX. 1 1/2" MIN CLEAR 2" MAX 1 1/4" MIN CLEAR 1 1/2" 1/8" MIN. RADIUS TYPICAL ALL CORNERS TYPE 1 TYPE 2 TYPE 3 TYPE (B) TYPE (C) TYPE (D)
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