4-3/8″ sphere for openings on the sides of stair treads. On monumental stairs, handrails shall be located along the most direct path of egress travel. Intermediate handrails are required so that all portions of the stairway width required for egress capacity are within 30 inches of a handrail. All portions of the stairway width required for egress capacity are within 30 inches (762mm) of a handrail. Height Requirements (of Guards) For Balconies, Galleries & Bleachers IBC 2000 (6) In assembly seating where guards in accordance with Section 1025.14 are permitted and provided. The height in assembly areas shall be in accordance with Section 508.12. In those applications, where the top rail also serves as a handrail, it shall have a height of not less than 34″ and not more than 38″ above stair nosing. 42″ minimum except in Group R-3, and within individual dwelling units of Group R-2. 
34″ minimum on the open side of stairs.36″ minimum on porches, balconies, raised floor surfaces.Height Requirements, Minimum for Guardrails IRC (5)
Measurement for the 30″ drop is to be taken at any point within 36″ from the edge of the open surface. 30″ above floor or grade below along glazed sides of stairways, ramps, and landings where the glazing provided does not meet the code’s strength and attachment requirements. 30″ above floor or grade below on open-sided walking surfaces, mezzanines, industrial equipment platforms, stairways, ramps and landings. On open sides of stairs with a total riser of more than 30″ above the floor or grade below. 30″ above floor or grade below on open-sided walking surfaces. The main purpose of building codes are to protect public health, safety and general welfare as they relate to the construction and occupancy of buildings and structures. The codes themselves are generally not legally binding. Building codes specify minimum standards for the construction of buildings and structures.
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