In a multistory building with 2 hour fire resistive floor construction, provision 3 states "all required exits.... discharge directly to the outside". What does "outside" mean? Does it mean they cannot re-enter the floor?
I am not up on 101
You are looking at the horizontal exit section
""directly to the outside". What does "outside" mean""
The required exit shall discharge to the outside, not into the building. As if you are in a stairwell, it dumps through an exterior door, not into a 1st floor lobby or such.
"""Does it mean they cannot re-enter the floor""" If you are talking the actual exit, NO
Did you read
22.214.171.124.2 * and do you understand what and how a horizontal exit is and works?
OHHH I am not an engineer, so you can discount my reply if you want, and I cannot do math.
This has reference from the international building code, but almost the same, and just for fyi::
a little more info
I believe the 2015 is the same as the 2012 (no indicating line of a change). So here goes:
126.96.36.199.3 speaks to horizontal exits as CDA noted. The question comes from 188.8.131.52.3(3) All required exits, other than horizontal exits, discharge directly to the outside. This is the third required criteria in a situation where a fire barrier provides a horizontal exit, and basically is for those other stories where the fire barrier may not be required if the three criteria are met.
It's actually not really clear what your question is as it relates specifically to this section. maybe you could explain what brings you to 184.108.40.206.3 so we can better answer? The way I see it given what you've asked is that the LSC requires that all other exits must terminate at the outside as they are not compliant horizontal exits? Seems like a fairly obvious thing to me, but again, with little context to refer to?
I just needed help clarify the horizontal exit concept. In the example, the exits at the ends of floors 5 and 6 are not exempted by Section 220.127.116.11.3 (3) in accordance with Section 18.104.22.168.2. Section 22.214.171.124.3 (3) means the 2-hr rated wall and door is the horizontal exit as shown on the example. For proper arrangement of the total means of egress system, it is simply a matter of designing each separated portion, or compartment, as if it were a completely separate building. The point of passage through the door assembly in the horizontal exit is treated as if it were passage through an exterior exit door assembly.
Example from the LSC Handbook:
126.96.36.199.3(3) is just eliminating the permission of Section 7.7.2 to permit exit discharge through the building. In other words, if you select to implement a horizontal exit, you cannot take advantage of Section 7.7.2 for any of the vertical exits unless the 2-hour fire barrier constituting the horizontal exit extends through all floors of the building. So more directly, yes it does not permit the stairs to reenter the building or floor.
As far as what constitutes exterior or outdoor, Section 7.7.1 already requires discharge to the exterior of the building providing a little more guidance than Section 188.8.131.52.3. Unfortunately, the annex material does not really provide guidance on what "exterior" is. However, given that this requirement revolves around fire related incidents, it is logical that where a stair discharges outside but is enclosed by some walls or roofs/canopies that provided smoke and heat would not accumulate similarly to an entirely exterior discharge that would be a condition that is defendable for a compliant design.
I feel more clarification. The three criteria of 184.108.40.206.3 apply only to the story with the horizontal exit:
Conditional statement in the code - "Where a fire barrier provides a horizontal exit in any story of the building..."
Joseph wrote: 220.127.116.11.3(3) is just eliminating the permission of Section 7.7.2 to permit exit discharge through the building. In other words, if you select to implement a horizontal exit, you cannot take advantage of Section 7.7.2 for any of the vertical exits unless the 2-hour fire barrier constituting the horizontal exit extends through all floors of the building. So more directly, yes it does not permit the stairs to reenter the building or floor.
The items I review and confirm on the design plans for horizontal exits:
Retrieving data ...