In accordance with Section 1004.3 through 1004.3.4, of Chapter 5, Article 7 of the LAMC. This assembly room or area is approved for the following use(s) and the maximum number of occupants shall not exceed that shown.
Number of Occupants:
Address of Occupancy:
Assembly Room Designation:
Alternating tread devices shall have a minimum tread depth of 5 inches (127 mm), a minimum projected tread depth of 81/2 inches (216 mm), a minimum tread width of 7 inches (178 mm) and a maximum riser height of 91/2 inches (241 mm). The tread depth shall be measured horizontally between the vertical planes of the foremost projections of adjacent treads. The riser height shall be measured vertically between the leading edges of adjacent treads. The riser height and tread depth provided shall result in an angle of ascent from the horizontal of between 50 and 70 degrees (0.87 and 1.22 rad). The initial tread of the device shall begin at the same elevation as the platform, landing or floor surface.
Exception: Alternating tread devices used as an element of a means of egress in buildings from a mezzanine area not more than 250 square feet (23 m2) in area that serves not more than five occupants shall have a minimum tread depth of 3 inches (76 mm) with a minimum projected tread depth of 101/2 inches (267 mm). The rise to the next alternating tread surface shall not exceed 8 inches (203 mm).
- Areas containing less than 5,000 square feet (465 m2) of usable floor space shall be provided with 6 feet (1829 mm) wide aisles arranged so as not to exceed the distance of travel requirements of this section.
- Areas containing 5,000 to 30,000 square feet (465 m2 to 2787 m2) of usable floor space shall be provided with 8 feet (2438 mm) wide aisles arranged so as to not exceed the distance of travel requirements of this section.
- Areas containing more than 30,000 square feet (2787 m2) of usable floor space shall be provided with 10 feet (3048 mm) wide aisles arranged so as to not exceed the distance of travel requirements of this section.
- Aisles that are provided for the convenience of persons in attendance and are not required for exit purposes may be reduced below the required aisle width by 2 feet (610 mm).