Exceptions: 21вЂі sphere forВ elevatedВ walk for electrical, mechanical and plumbing systems and Group I-3, F, H, or S occupancies, balusters, horizontal intermediate rails or other construction. 6вЂі sphere - at triangle formed by riser, tread and bottom rail 4вЂі sphere - general - to a height of 34вЂі Openings for required guards on the sides of stair treads shall not allow a sphere 43/8вЂі to pass through. The triangular openings formed by the riser, tread and bottom rail of a guard at the open side of a stairway are permitted to be of such a size that a sphere 6 inches (152 mm) cannot pass through.Дў. Required guards on open sides of stairways, raised floor areas, balconies and porches shall have intermediate rails or ornamental closures which do not allow passage of a sphere 4вЂі or more in diameter.ДЎ. 6вЂі sphere - atВ triangleВ formed byВ riser, tread and bottom rail. 4-3/8вЂі 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. HeightВ Requirements (of Guards) For Balconies, Galleries & BleachersДЄll portions of the stairway width required for egress capacity are within 30 inches (762mm) of a handrail. 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 1008.12. In those applications, where the top rail also serves as a handrail, it shall have a height of not less than 34вЂі and not more than 38вЂі above stair nosing. 36вЂі minimum on porches, balconies, raised floor surfaces.Д¤2вЂі minimum except in Group R-3, and within HeightВ Requirments, Minimum for Guardrails Measurement for the 30вЂі drop is to be taken at any point within 36вЂі from the edge of the open surface. 30вЂі above floor or grade below along glazed sides of stairways,В rampsВ and landings where the glazing provided does not meet the codeвЂ™s strength and attachment requirements. 30вЂі above floor or grade below on open-sided walking surfaces, mezzanines, industrial equipment platforms, stairways,В rampsВ and landings. On open sides of stairs with a totalВ riserВ of more than 30вЂі above the floor or grade below.

30вЂі above floor or grade below on open-sided walking surfaces.

2009 irc stair rail code