Egress through Intervening Spaces w/ different Max Travel Distances

[Mech]

2015 IBC

Unlimited Area building, Non-separated B, F-2, S-2 use groups with sprinklers.

Maximum travel distance is 400 ft for F-2 and S-2, but only 300 ft for B.

If I want to have people from the F-2 and S-2 areas egress through the B section, what is the maximum travel distance allowed for F-2 and S-2? Would I perform a unity calculation by verifying the ratio of the distance traveled in the F-2 and S-2 area divided by 400 ft (maximum for F-2 and S-2) plus the distance traveled in the B area divided by 300 (max for B) equals less than or equal to 1?

The portion of travel in the B occupancy is through one of two corridors that are each less than 40 ft long and are straight. The corridors have doors opening to offices, toilet rooms, cafeteria, and/or a closet.

 

[cda]

I am thinking max is what occupancy you start in

And does not change


Maximum travel distance is 400 ft for F-2 and S-2, but only 300 ft for B.


Interesting question. Will see what others say.


What are the total building dimensions ??

And occupant load?

 

[RLGA]

As cda states, it is where you start. If you are in a Group F-2 and you egress through a Group B, you have 400 feet of travel distance permitted. If you are in a Group B and you egress through a Group F-2, you have 300 feet of travel distance permitted.

 

[north star]

$ ~ $ ~ $

Mech,

FWIW, ...I also agree with **cda** & **RLGA**.
The actual 400 ft. distance is a non-negotiable
length.......That is the absolute max. distance of travel
permitted, regardless of which Occ. Groups are
egressed through.

$ ~ $ ~ $

 

[TheCommish]

I see a rated exit corridor coming to this project

 

[steveray]

Its where you start....You don't get more even if you enter a space with more, and certainly not with less....Corridor would not help with TD, Rated EXIT would...

 

[Mech]

Thank you for the replies. I ran out of time last night when writing my post. I wanted to get out of the city before it got too late.

cda - the building is 400,000 sq ft. It is about 785'x510'

I would never increase the max allowable beyond what is written in the code . . . and I would not try to travel 400 ft from F-2 and then an additional 300 ft from B.

 

[cda]

I see a rated exit corridor coming to this project

Exit passageway?

 

[cda]

Thank you for the replies. I ran out of time last night when writing my post. I wanted to get out of the city before it got too late.

cda - the building is 400,000 sq ft. It is about 785'x510'

I would never increase the max allowable beyond what is written in the code . . . and I would not try to travel 400 ft from F-2 and then an additional 300 ft from B.

Add more exit doors in the F-2?

 

[Mech]

More doors or revise the equipment layout would work. The building has been erected under a shell permit. We are preparing an egress plan now that the F-2 / S-2 is being fitted out by the owner.

 

[jj1289]

You can also look into the possible use of a horizontal exit IBC section 1026