San Francisco County Municipal Code Ch. 10 Means of Egress

SECTION 1010 – DOORS, GATES AND TURNSTILES 1010.1.2 Revise item 4 as follows: 4. Other than the main egress door at the primary entry, doors within or serving a single dwelling unit in Groups R-2 and R-3. SECTION 1011 – STAIRWAYS 1011.5.5 Modify the first sentence of the first paragraph as follows: For all occupancies except R-3 one and two family dwellings and townhouses nosings shall have a curvature or bevel of not less than 1/16 inch (1.6 mm) but not more than 9/16 inch (14.3 mm) from the foremost projection of the tread. Risers shall be solid and vertical or sloped under the tread above from the underside of the nosing above at an angle not more than 30 degrees (0.52 rad) from the vertical. 1011.5.5 Add a second paragraph as follows: For R-3 one- and two-family dwellings and townhouses, the radius of curvature at the nosing shall be no greater than 9/16 inch (14 mm). A nosing not less than 3/4 inch (19 mm) but not more than 1-1/4 inches (32 mm) shall be provided on stairways with solid risers. The greatest nosing projection shall not exceed the smallest nosing projection by more than 3/8 inch (9.5 mm) between two stories, including the nosing at the level of floors and landings. Beveling of nosings shall not exceed 1/2 inch (12.7 mm). Exception: A nosing projection is not required where the tread depth is not less than 11 inches (279 mm). [CRC R318.7.5.3] 1011.5.5.1 Modify the first sentence of the first paragraph as follows: For all occupancies except R-3 one- and two-family dwellings and townhouses the leading edge (nosings) of treads shall project not more than 1¼ inches (32 mm) beyond the tread below.

Exception: Other than where required by Section 1011.12.1, in buildings without an occupiable roof access to the roof from the top story shall be permitted to be by an alternating tread device, a ships ladder or a permanent ladder. Stairs or ladders used only to attend equipment or window

wells are exempt from the requirements of this chapter.

1011.12.3 Stairway replacement. Stairways that replace existing stairways in residential occupancies and which complied with the code in effect at the time they were constructed, and which have been adequately maintained and increased in relation to any increase in occupant load, alteration or addition, or any change in occupancy, may be reconstructed in the same configuration and construction as the existing stairways. SECTION 1012 – RAMPS

Exception: For R-3 one- and two-family dwellings and townhouses, where it is technically infeasible to comply because of site constraints, ramps may have a maximum slope of one unit vertical in eight units horizontal (12.5 percent). [CRC R318.8.1] SECTION 1013 – EXIT SIGNS

Doorways or other openings leading to a fire escape, except within individual dwelling units, shall be provided with a sign reading “FIRE ESCAPE” in letters not less than 6 inches (152 mm) high, in high contrast with the background. SECTION 1015 – GUARDS

1. For occupancies other than R-3 and townhouses, from a height of 36 inches (914 mm) to 42 inches (1067 mm), guards shall not have openings that allow passage of a sphere 4 3/8 inches (111 mm) in diameter. SECTION 1016 – EXIT ACCESS

8. For one- and two-family dwellings and townhouses, the means of egress is allowed to pass through rooms and intervening spaces except garages. [CRC R318.1]

For habitable levels or basements in R-3 occupancies or townhouses that are located more than one story above or more

than one story below an egress door, the maximum travel distance from any occupied point to a stairway or ramp that provides egress from such habitable level or basement shall not exceed 50 feet (15240 mm). [CRC R318.4] Add chapter as follows: