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Exterior wall of egress stair tower required to be fire rated?

The fire-resistance rating for an exterior wall of a shaft or a stair/ramp enclosure is based on the construction type per Table 601 and the fire separation distance per Table 602.
 
Yea which should be 0 according to those tables but I've seen many life safety plans where the entire stair enclosure is rated eventhough its nowhere near any buildings - just making sure that's the case
 
gnarkill283 said:
Yea which should be 0 according to those tables but I've seen many life safety plans where the entire stair enclosure is rated eventhough its nowhere near any buildings - just making sure that's the case
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That's because they probably don't know any better. See Section 1023.7 for stair/ramp enclosures and Section 713.6 for shafts.
 
steveray said:
If the building the stair serves is a threat (<180 exposure 10'ish) then yes....Not just other buildings...
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Steveray, the requirement still does not require the exterior wall of the stairway enclosure to be rated--it just requires that the wall that is less than 180 degrees from the nonrated wall have a 1-hour fire-resistance rating and 3/4-hour protected openings within 10 feet.

This is what Section 1023.7 is stating:

Stair Enclosure Exterior Wall.png
 
Correct...or rate the entire stair enclosure as you would if it were enveloped by the building....whichever is easier....At 1hr and 2 story it is probably a toss up and may depend on openings....
 
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