Los Angeles County Municipal Code § 1207.9 Fire Code

ESS located in walk-in units on rooftops or in walk-in units in open parking garages shall be provided with automatic fire suppression systems within the ESS enclosure in accordance with Section 1207.5.5. Areas containing ESS other than walk-in units in open parking structures on levels not open above to the sky shall be provided with an automatic fire suppression system complying with Section 1207.5.5.

Exception: A fire suppression system is not required in open parking garages if large-scale fire testing complying with Section 1207.1.5 is approved and includes evidence that shows that a fire will not impact the exposures in Section 1207.9.3.

ESS and associated equipment that are located on rooftops and not enclosed by building construction shall comply with the following:

Stairway access to the roof for emergency response and fire department personnel shall be provided either through a bulkhead from the interior of the building or a stairway on the exterior of the building.

Service walkways at least 5 feet (1524 mm) in width shall be provided for service and emergency personnel from the point of access to the roof to the system.

ESS and associated equipment shall be located from the edge of the roof a distance equal to at least the height of the system, equipment or component but not less than 10 feet (3048 mm).

The roofing shall be noncombustible or shall have a Class A rating when tested in accordance with ASTM E108 or UL 790, and shall in all cases require the approval of the fire code official based upon large-scale fire testing approved in accordance with Section 1207.1.5.

A Class I standpipe outlet shall be installed at an approved location on the roof level of the building or in the stairway bulkhead at the top level.

The ESS shall be the minimum of 25 feet (7620 mm) from all stairwells, egress pathways, and the fire service access point(s) on the rooftop. ESS shall not be installed within 25 feet (7620 mm) of any rooftop access bulkhead/hatch from the interior of the building.