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CORRIDOR vs BLDG Lobby

A

alexq

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Joined
Oct 25, 2017
Messages
7
Location
Dallas, TX
fy79T6
Thanks for viewing:
I am designing a remodel for a lobby of a 27 story building built in 1953 (non-sprinklered). The main entrance/exit I am moving over 1 structural bay. Existing entrance is all non-rated glass doors and windows. There is also a secondary exit in the back via a fire-separated passageway.

The plan reviewer is commenting that the entire ground-level lobby space is considered a corridor and should therefore be 1 hour rated everywhere, including the entrance doors and windows. This would make for an expensive and unsightly door/window assembly. I believe that the lobby space should not be considered a corridor, but rather an assembly space.

Please let me know if you know otherwise. See image here: https://ibb.co/fy79T6

Thanks,
Alex
 
And what assembly function would it be per chapter three definitions? A-1, A-2, A-3, A-4 or A-5?
Look at the descriptions.
What function would it be?
 
ADAguy said:
As an assembly space what advantage do you gain, they must be protected too?
Click to expand...
You are right - having a 1 hour rated interior is not a problem. The problem is the main entrance to the building. The reviewer wants this main entrance (all glass) to be rated as well.
 
mark handler said:
And what assembly function would it be per chapter three definitions? A-1, A-2, A-3, A-4 or A-5?
Look at the descriptions.
What function would it be?
Click to expand...
The building is a B occupancy (office building) but the lobby of it would be an ASSEMBLY WITHOUT FIXED SEATS, unconcentrated per Table 1004.1.2
 
If it is an exterior wall

Per corridor should not have to be rated

Is there another reason to rate it?? Distance to a building , property line other ??
 
cda said:
If it is an exterior wall

Per corridor should not have to be rated

Is there another reason to rate it?? Distance to a building , property line other ??
Click to expand...
Thanks! Exactly what I thought. Can you please direct me to where it says this in the code? I am looking through section 708 and 1020.1..
 
Not going to be 1020

It is the code of common sense IBC section use your head

That is not directed at you

Just like if you have a rated enclousure, the doors in it have to be rated,,, till you hit the bottom extrerior door, than it does not have to be rated.

There are a few smarter people on here that will explain it better.


Maybe if that person has a boss talk to them.
Hopefully it is not a one horse town
 
cda said:
Not going to be 1020
Click to expand...

How about 1020.1 exception #5:

SECTION 1020
CORRIDORS
1020.1 Construction. Corridors shall be fire-resistance rated in accordance with Table 1020.1. The corridor walls required to be fire-resistance rated shall comply with Section 708 for fire partitions.
Exceptions:​
5. Corridors adjacent to the exterior walls of buildings shall be permitted to have unprotected openings on unrated exterior walls where unrated walls are permitted by Table 602 and unprotected openings are permitted by Table 705.8.
 
Yikes said:
How about 1020.1 exception #5:

SECTION 1020
CORRIDORS
1020.1 Construction. Corridors shall be fire-resistance rated in accordance with Table 1020.1. The corridor walls required to be fire-resistance rated shall comply with Section 708 for fire partitions.
Exceptions:​
5. Corridors adjacent to the exterior walls of buildings shall be permitted to have unprotected openings on unrated exterior walls where unrated walls are permitted by Table 602 and unprotected openings are permitted by Table 705.8.
Click to expand...
That's the answer
 
Yikes said:
How about 1020.1 exception #5:

SECTION 1020
CORRIDORS
1020.1 Construction. Corridors shall be fire-resistance rated in accordance with Table 1020.1. The corridor walls required to be fire-resistance rated shall comply with Section 708 for fire partitions.
Exceptions:​
5. Corridors adjacent to the exterior walls of buildings shall be permitted to have unprotected openings on unrated exterior walls where unrated walls are permitted by Table 602 and unprotected openings are permitted by Table 705.8.
Click to expand...


BINGO

Guess I should read that darn book


I new there were smarter people than I or is it me.
 
I read this before going into teaching my class and didn't have time to respond, but now I'm looking at it, and Yikes has nailed the answer.
 
Yikes said:
How about 1020.1 exception #5:

SECTION 1020
CORRIDORS
1020.1 Construction. Corridors shall be fire-resistance rated in accordance with Table 1020.1. The corridor walls required to be fire-resistance rated shall comply with Section 708 for fire partitions.
Exceptions:​
5. Corridors adjacent to the exterior walls of buildings shall be permitted to have unprotected openings on unrated exterior walls where unrated walls are permitted by Table 602 and unprotected openings are permitted by Table 705.8.
Click to expand...

Thank you very much - appreciate it.
 
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