Index of Sections
|SECTION 345B -ACCESS AND MEANS OF EGRESS FACILITIES AND EMERGENCY ESCAPES (PART TWO)|
|345B.1.4 The Exit Access
345B.1.4.1 General. The exit access shall be pursuant to Section 1004 and as herein provided.
|345B.1.4.2 Separation of exits. When two exits are required in
an existing building that has only one existing exit stairway,
a second exit that complies with current code may be constructed
next to the existing stairway if the arrangement of the stairways
meet the following conditions:
1. The entry to the stairways are at opposite ends.
2. Any hallway or corridor connecting the entries to the stairways is constructed pursuant toe Section 1004.3.4.3
3. A horizontal exit wall bisects the building and stairways.
4. Any area of the floor has access to either stairway.
|This is a particularly helpful provision that addresses a common situation: an existing alder building which has only one exit stairway but which is required as a change of use to have two means of egress. The solution (see figure _____) is similar to the New York-style "scissor stair", and can serve as a crucial aid in making possible the conversion of a building which might otherwise be unworkable. To address some specifics: in #2, this means a fire rated corridor, and "horizontal exit wall" is a fire-rated wall.|
345B.5 Emergency Escape and Rescue.
Every joint living and work quarters (JLWQ) shall have at least
one emergency escape and rescue window or door for each separate
sleeping room or sleeping area pursuant to Section 310.4 and as
334B.5 Emergency Escape and Rescue.
345B.5.2 Sleeping Area.
If a sleeping area is located in the common atmosphere of a room,
even if the room is at a different level from the sleeping area
and/or has multiple levels, and is not separated from the room
with a wall greater than 42 inches high above the finish floor
level of the sleeping area, the required emergency escape and
rescue window or door may be located in the room provided:
334B.5.2 Sleeping Area.
In order to accommodate this situation, Oakland (among other cities) has ruled that as long as one can easily see to the sleeping space or spaces from a complying escape windowmeaning that the sleeping space is in a mezzanine that is open except for a rail not exceeding 42" in heightthe requirements for emergency escape and rescue are met. This is referred to as "line-of-sight" visual access. There also needs to be a direct path of travel between the sleeping area and its escape opening.
More than one sleeping area may use the same escape window or door as long as the emergency escape and rescue window or door serving each sleeping area meets the above requirements.
|345B.1.1.4 Publicly-funded JLWQ Without Employees and Not Regularly Open to the Public. Buildings with F-7 Occupancy JLWQ that are publicly funded (owned, operated, or maintained by a public jurisdiction) and do not have employees and are not regularly open to the public shall comply with the applicable accessibility regulations for publicly funded residential occupancy pursuant to Chapter 11B and also Federal requirements if more stringent.|
|345B.1.1.5 Publicly-funded JLWQ With Employees and/or Are Regularly Open to the Public. Buildings with F-7 Occupancy JLWQ that are publicly funded (owned, operated, or maintained by a public jurisdiction) and do have employees and/or are regularly open to the public shall comply with the applicable accessibility regulations pursuant to Chapter 11B and also Federal requirements if more stringent.|
|345B.5.3 Alternative Emergency Escape and Rescue in Existing Buildings.
345B.5.3.1 In an existing building where no exterior wall of the sleeping area of an individual space or JLWQ abuts a public street, public alley, yard or exit court any one of the following alternatives may be used. Signage to indicate the point of emergency egress and rescue and other facilities to ensure ease of access and egress along the escape and rescue path shall be installed to meet the recommendations of the Fire Marshal and the Building Official:
1. An escape and rescue door may open directly into a corridor if the corridor is constructed to meet the requirements for an extent of stairway enclosure pursuant to Section 1009.4 including provisions for openings and doors, appropriate for the configuration of the building in which it is located. A "Knox Box" with keys shall be provided in an approved location for the Fire Department's use.
2. A one-hour fire-resistive compartment with one-hour label exit door and equipped with a ships ladder to the roof. A minimum 36 inches by 48 inches clear landing shall be provided in front of the bottom of the ships ladder. Emergency lighting, a counter-balanced roof hatch, and marked exit path across the roof to an approved fire escape or escape ladder shall be provided.
3. If a court without access to a public way on the property is available, then an approved fire escape or escape ladders may either lead to the roof similar to alternative 2 above, or to the bottom of the court. An approved fire department access path to the bottom of the court shall be provided to meet the recommendations of the Fire Marshal and Building Official. A "Knox Box" shall be provided if there are any locked doors or gates along the fire department access path.
When the roof is part of an alternative emergency escape and rescue method, the roof structure at the exit path and the queuing area to the escape ladder or stair off of the roof shall consider the live loads added to Table 16-A in Section 330B. The queuing area provided shall be 3 square feet per occupant for the occupant load served by the alternative emergency escape and rescue.
334B.5.3 Alternative Emergency Escape and Rescue in Existing Buildings.
|345B.5.3.2 Notice of Limitation. If any alternative emergency escape and rescue method is used a "notice of limitation" shall be recorded with the Alameda County Recorder's Office with a waiver of damages and holding the City harmless for any litigation relating to alternative emergency escape and rescue provided.|
|345B.5.3.3 Exit Path Roof Load. The roof exit path and a minimum 10 feet square queuing area at the escape stair or ladder off of the roof shall be structurally designed for the loads pursuant to Section 330B.|
|345B.6 Occupant Load
345B.6.1 General. Occupant loads for buildings with F-7 occupancies shall comply with Table 10-A - Minimum Egress Requirements for the appropriate use and as herein provided. See Section 338B.1.2 for special provision related to exits for individual spaces due to presence of hazardous materials.
|345B.6.2 Occupant Load Factor For Individual JLWQ Without Employees or Having Regular Hours for Being Open to the Public. Occupant load factor for individual JLWQ without employees or having regular hours open to the public shall be 200 square feet per occupant with area based on the superficial floor area of the individual unit.||
334B.6.2 Occupant Load Factor For Individual JLWQ Without Employees or Having Regular Hours for Being Open to the Public.
|345B.6.3 Occupant Load Factor For Individual JLWQ With Employees and/or Having Regular Hours Open to the Public. Occupant load factor for individual JLWQ with employees and/or regular hours open to the public shall be 200 square feet per occupant for the superficial floor area of the designated residential portion of the individual JLWQ and 100 square feet per occupant for the superficial floor area of the non-residential portion of the individual JLWQ.|
345B.7.1 General. Code provisions pertinent to guardrails apply to F-7 occupancies as for an F-1 Occupancy except as herein provided for the individual JLWQ.
|345B.7.2 Required guardrails including sleeping mezzanine guardrails for an individual JLWQ may be a minimum of 36 inches in height. A built-in sleeping bunk need not have a guardrail but shall have a railing that has a height of at least one-third of the clear floor to ceiling height measured vertically at the rail. This railing need not exceed 36 inches.||
Normally, in all but private residences, guardrails for decks and open stairs are required to be a minimum 42" high. This provision states that within live/work units guardrails may be a minimum 36" in height.