14B-10-1015  Guards.
The provisions of Section 1015 of IBC are adopted by reference with the following modifications:
1.   Add a new exception 8 to Section 1015.2 to read:
“8.   On the loading side of passenger platforms for fixed guideway transit and passenger rail systems.”
2.   Revise item 1 of Section 1015.3 to read:
“1.   From adjacent walking surfaces, excluding any horizontal surface 12 inches (305 mm) or less in depth measured perpendicular to the guard.”
3.   Revise exceptions 1, 2 and 3 to Section 1015.3 to read:
“1.   For occupancies in Group R-3 and R-5 not more than three stories above grade plane in height and within individual dwelling units in occupancies in Group R-2, and outdoor areas of individual dwelling units located not more than three stories above grade plane, required guards shall be not less than 36 inches (914 mm) in height measured vertically above the adjacent walking surfaces.
2.   For occupancies in Group R-3 and R-5, and within individual dwelling units in occupancies in Group R-2, guards on the open sides of stairs shall have a height not less than 34 inches (864 mm) measured vertically from a line connecting the leading edges of the treads.
3.   For occupancies in Group R-3 and R-5, and within individual dwelling units in occupancies in Group R-2, where the top of the guard serves as a handrail on the open sides of stairs, the top of the guard shall be not less than 34 inches (864 mm) and not more than 38 inches (965 mm) measured vertically from a line connecting the leading edges of the treads.”
4.   Revise the exceptions to Section 1015.4 to read:
Exceptions:
1.   From a height of 36 inches (914 mm) to 42 inches (1067 mm), guards shall not have openings that allow passage of a sphere 6 inches (152 mm) in diameter.
2.   The triangular openings at the open sides of a stair, formed by the riser, tread and bottom rail shall not allow passage of a sphere 6 inches (152 mm) in diameter.
3.   At elevated walking surfaces for access to and use of electrical, mechanical or plumbing systems or equipment, guards shall not have openings that allow passage of a sphere 21 inches (533 mm) in diameter.
4.   In areas that are not open to the public within occupancies in Group I-3, F, H, M or S; for alternating tread devices and ship's ladders; and in similar locations where children under the age of 5 are unlikely to be present that are approved by the building official, guards shall not have openings that allow passage of a sphere 21 inches (533 mm) in diameter.
5.   In assembly seating areas, guards required at the end of aisles in accordance with Section 1029.17.4 shall not have openings that allow passage of a sphere 4 inches (102 mm) in diameter up to a height of 26 inches (660 mm). From a height of 26 inches (660 mm) to 42 inches (1067 mm) above the adjacent walking surfaces, guards shall not have openings that allow passage of a sphere 8 inches (203 mm) in diameter.
6.   Within individual dwelling units and sleeping units in Group R-2, R-3 and R-5 occupancies, guards shall not have openings that allow passage of a sphere 4 3/8 (111 mm) inches in diameter.
5.   Revise Section 1015.5 to read:
1015.5 Screen porches.
Porches and decks that are enclosed with insect screening shall be provided with guards where the walking surface is located more than 30 inches (762 mm) above the floor or grade below at any point within 36 inches (914 mm) horizontally to the edge of the screening.”
6.   Revise Section 1015.8 and its subparts to read:
1015.8 Window openings.
Windows in Group R buildings including dwelling units or sleeping units, where the top of the sill of an operable window opening is located less than 36 inches above the finished floor and more than 72 inches (1829 mm) above the finished grade or other surface below on the exterior of the building, shall comply with one of the following:
1.   Operable windows where the top of the sill of the opening is located more than 75 feet (22 860 mm) above the finished grade or other surface below and that are provided with window fall prevention devices that comply with ASTM F2006.
2.   Operable windows where the openings will not allow a 4-inch-diameter (102 mm) sphere within 36 inches (914 mm) of the finished floor or a 6-inch-diameter (152 mm) sphere within 42 inches (1067 mm) of the finished floor to pass through the opening when the window is in its largest opened position.
3.   Operable windows where the openings are provided with window fall prevention devices that comply with ASTM F2090.
4.   Operable windows that are provided with window opening control devices that comply with ASTM F2090.
Exception: In Group R-2 and R-5 occupancies this section only applies where either:
1.   The top of the sill of an operable window opening is located less than 24 inches (610 mm) above the finished floor and at least 72 inches (1829 mm) but not more than 20 feet (6096 mm) above the finished grade or other surface below on the exterior of the building.
2.   The top of the sill of an operable window opening is located less than 36 inches (914 mm) above the finished floor and more than 20 feet (6096 mm) above the finished grade or other surface below on the exterior of the building.”
(Amend Coun. J. 2-19-20, p. 14473, Art. II, § 46)