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• <br /> IQC A117.1-2009 Chapter 5. General Site and Building Elements <br /> 2, Handrail extensions are not required in aisles 12 min <br /> serving seating where the handrails are dis- 305 <br /> • continuous to provide access to seating and to <br /> permit crossovers within the aisle. <br /> 3. In alterations, full extensions of handrails shall <br /> not be required where such extensions would <br /> be hazardous due to plan configuration. <br /> 505.10.1 Top and Bottom Extension at Ramps. <br /> Ramp handrails shall extend horizontally above the <br /> landing 12 inches(305 mm) minimum beyond the top <br /> and bottom of ramp runs. Extensions shall return to a <br /> wall, guard, or floor, or shall be continuous to the <br /> handrail of an adjacent ramp run. • <br /> 505.10.2 Top Extension at Stairs. At the top of a • • <br /> stair flight, handrails shall extend horizontally above <br /> the landing for 12 inches (305 mm) minimum begin- <br /> ning directly above the landing nosing. Extensions r'> <br /> shall return to a wall,guard, or the landing surface, or <br /> shall be continuous to the handrail of an adjacent FIG'505.10.2 <br /> TOP HANDRAIL EXTENSIONS AT STAIRS <br /> stair flight. <br /> 4--61/4 perimeter <br /> 100—160 <br /> 11114-2 , 2114 max <br /> 32 51 57 <br /> L- <br /> 1 , <br /> (a) (b) (C) <br /> Circular Noncircular <br /> FIG.505.7 <br /> HANDRAIL CROSS SECTION <br /> 12 min <br /> 3{15 <br /> 12 min <br /> 111.111111.111111111111 ,• <br /> . ) NG.505.10.1 <br /> TOP AND BOTTOM HANDRAIL EXTENSIONS AT RAMPS <br />