IEBC: is one exit stair permissible in this situation?

[CLTS]

Change of occupancy from R-1 to A-3

 

[Mr. Inspector]

Not enough info

 

[classicT]

Not near enough info. Need dimensions at minimum.

 

[steveray]

Distances and occupant load required....How many stories......

 

[CLTS]

Dimensions? see below

Occupant load? 100

The stair exiting the space is 3'-6" wide

How many stories? this is the upper level and fourth story

 

[Sifu]

This would be an A-2 if using the IBC, and I think the answer is no, a single exit stair wouldn't be permitted per IEBC t805.3.1.1(2).

 

[classicT]

Yeah, no. Not a chance that a single exit will cut it. OL at 100 and 4th story, you are not even close.

 

[classicT]

2021 IEBC/IBC​

IEBC 1011.5.1 Means of Egress for Change to a Higher-Hazard Category​

Where a change of occupancy classification is made to a higher-hazard category (lower number) as shown in Table 1011.5, the means of egress shall comply with the requirements of Chapter 10 of the International Building Code.
Exceptions:

1. Stairways shall be enclosed in compliance with the applicable provisions of Section 903.1.
2. Existing stairways including handrails and guards complying with the requirements of Chapter 9 shall be permitted for continued use subject to approval of the code official.
3. Any stairway replacing an existing stairway within a space where the pitch or slope cannot be reduced because of existing construction shall not be required to comply with the maximum riser height and minimum tread depth requirements.
4. Existing corridor walls constructed on both sides of wood lath and plaster in good condition or 1/2-inch-thick (12.7 mm) gypsum wallboard shall be permitted. Such walls shall either terminate at the underside of a ceiling of equivalent construction or extend to the underside of the floor or roof next above.
5. Existing corridor doorways, transoms and other corridor openings shall comply with the requirements in Sections 804.6.1, 804.6.2 and 804.6.3.
6. Existing dead-end corridors shall comply with the requirements in Section 804.7.
7. An operable window complying with Section 1011.5.6 shall be accepted as an emergency escape and rescue opening.

IBC 1006.2.1 Egress Based on Occupant Load and Common Path of Egress Travel Distance​

Two exits or exit access doorways from any space shall be provided where the design occupant load or the common path of egress travel distance exceeds the values listed in Table 1006.2.1. The cumulative occupant load from adjacent rooms, areas or spaces shall be determined in accordance with Section 1004.2.
Exceptions:

1. The number of exits from foyers, lobbies, vestibules or similar spaces need not be based on cumulative occupant loads for areas discharging through such spaces, but the capacity of the exits from such spaces shall be based on applicable cumulative occupant loads.
2. Care suites in Group I-2 occupancies complying with Section 407.4.
3. Unoccupied mechanical rooms and penthouses are not required to comply with the common path of egress travel distance measurement.

IBC 1006.3 Egress From Stories or Occupied Roofs​

The means of egress system serving any story or occupied roof shall be provided with the number of separate and distinct exits or access to exits based on the aggregate occupant load served in accordance with this section.

IBC 1006.3.3 Egress Based on Occupant Load​

Each story and occupied roof shall have the minimum number of separate and distinct exits, or access to exits, as specified in Table 1006.3.3. A single exit or access to a single exit shall be permitted in accordance with Section 1006.3.4. The required number of exits, or exit access stairways or ramps providing access to exits, from any story or occupied roof shall be maintained until arrival at the exit discharge or a public way.

TABLE 1006.3.3
MINIMUM NUMBER OF EXITS OR ACCESS TO EXITS PER STORY​

OCCUPANT LOAD PER STORY	MINIMUM NUMBER OF EXITS OR ACCESS TO EXITS FROM STORY
1-500	2
501-1,000	3
More than 1,000	4

 

[mtlogcabin]

How many stories? this is the upper level and fourth story

1006.3.2 Egress based on occupant load.
Each story and occupied roof shall have the minimum number of separate and distinct exits, or access to exits, as specified in Table 1006.3.2. A single exit or access to a single exit shall be permitted in accordance with Section 1006.3.3.



An "A" occupancy is not permitted more than one story above grade with a single exit.

 

[Sifu]

The IEBC path to the answer is a multi-step process, but eventually you land at IEBC t805.3.1.1(2). Ironically, that table is more restrictive than IBC t1006.3.3(2). Either way it doesn't fly.

 

[Paul Sweet]

Also, the IBC classifies restaurants as A-2, not A-3, and requires sprinklers for 100 or more occupants (903.2.1.2).