Two-story enclosed stair

[Sifu]

I am caught in another loop. I have a two-story, VB, sprinklered building. There are two stairs, and an elevator. One stair is an open exit access stair, permitted by 1019.3. The other is enclosed. If it is enclosed, does the enclosure require a fire-rating?

We have had a similar discussion about an elevator shaft.
https://www.thebuildingcodeforum.com/forum/threads/2-story-hoistway-enclosure.33182/#post-258486 in which it was concluded that if an enclosure is provided then 3002.1 requires an enclosure to be a shaft in accordance with 712 AND 713. So when following 713, a two-story hoistway enclosure must be a shaft enclosure and it must be 1-hr rated per 713.4.

Does the same logic (code section/s?) require a stair enclosure to be rated if provided? Is it automatically an "interior exit stairway"?

 

[steveray]

If it is not required to be enclosed (rated), then it is not required to be rated....?

 

[Sifu]

If it is not required to be enclosed (rated), then it is not required to be rated....?

So that is my general thinking, but the elevator discussion has me second-guessing. Since it is enclosed is there an expectation of "protection"? This particular enclosure is solid masonry, but they aren't labeling it as rated, nor are they providing rated openings. The CMU wall is easy to rate using the inherent properties of masonry, so if it is required to be rated then they just need to control any penetrations and openings.

 

[steveray]

Yep...

3002.1 says a hoistway enclosure shall be a shaft enclosure complying with 712 AND 713.

No such section for the stair enclosure....just the hoistway...Thats the difference...