Number of exits?

[Sifu]

A little messy, but I'll try:


Given a space within a floor of a 6 story, mixed use, R2, S2, M, B building. The floor has 3 exits. The space, isolated within the floor has an A-use space with 46 occupants, several B-use spaces with a combined occupant load of 34. Total occupant load of the space is 81. One of the floor exits is accessed from within the room. Other doors from the room lead to corridors that lead to the other two exits, but none of them swing in the direction of travel. According to t1006.2.1 (2018 IBC) two exits are required if any of the individually classified spaces exceed the table value. Taking the A space as an A, it does not exceed 49. Taking the B spaces combined does not exceed 49. Viewed this way, with each occupancy being under the tabular value, is a second exit required?

Now, consider the A space "shall be classified" as a B, then the total occupant load of B spaces would exceed 49 and require a second exit. Since none of the other exit doors swing in the direction of travel, is this compliant?

Try to ignore the occupant loads shown, I have questions about that too.

 

[cda]

So which door leads to the other exits??!

I would say depending on which door it is, that door needs to swing towards the other two exits,,,

Because of the combined total ol from all of the rooms around 81

If my call is right, they may need two double swing doors, one to get back into 81

 

[Sifu]

Plan south is a door that leads to a hatched area. This is a corridor that leads to the other two exits (it splits into two directions). What you can't see is that on plan east the double doors that enter that space has a load of 157 people. So the problems are compounding. I think they need two exits out of this space based on occupant load, combined occupant load and capacity of the one exit access door. (Plan west does show the occupant load from the amenity area at 210. From what I can tell, there are 448 occupants getting crammed into a 32" clear opening or up against other doors that swing the wrong way. This one is making me question what I thought I knew. Really feel like I must be missing something.

 

[cda]

I dont think they need two exits,,

Somehow fix door swing.

Somehow check for dead end corridor.

Somehow make sure there is access for everyone to TWO exits.

I take it this is the 3rd floor?

 

[steveray]

Add the A to the B as they are the same number......

 

[SH225]

What is the grand total occupant load at this level? The first thing I typically do is divide the total occupant load of the level by the number of available exits.

I’d say the 81 occupants in the amenity space require access to at least two exits, with the doors swinging in the direction of egress travel from that space. These are cumulative occupant loads as described in 1004.2. Based on the plan graphics, the architect has 210 + 81 going into the exit stairway in the amenity space. Capacity there is about 165 if we assume 33 inches clear and 0.2 inch per occupant.

 

[Sifu]

Had a meeting with all the principles, not losing my mind. They acknowledged lots of issues in this preliminary design, including occupant loads, exit sizing, direction of travel, etc. Hopefully the conversation will yield results in the final design.