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4/10/2013 2:54:58 PM
We are working on a three story residential project that meets all the requirements of IBC 2009 for a single exit building. However, we'd like the exit to not discharge direct to the exterior, instead going through a small rated lobby with elevator access. IBC is very specific in allowing 50% of your exits to exit through a vestibule or lobby (pending certain criteria) in Section 1027.1. However, I can not find where or how this would apply to a single exit building.
Any information would be much appreciated!
4/10/2013 7:56:33 PM
If you are saying you want to have the exit access completely inside the building, I'm not sure how you would meet the 50 foot travel distance to an exit. Is the rated enclosure an exit enclosure or a corridor?
4/10/2013 8:40:08 PM
ICC 1021.1 Number of Exits and Continuity - establishes the # of exits based upon occupant load (OL).
Exception 4 allows one means of egress for R-2 and R-3 with maximum OL of 20 and a fire sprinkler system.
Exception 5 allows one exit if in compliance with 1015.1 with exits that discharge directly to the exterior.
ICC 1015.1 requires two exists unless one of the 4 exceptions are meet.
ICC 1021.2 Single Exits - Occupancies shall be permitted to have one exit if in compliance with Table 1021.2. For an R-2 occupancy, the requirements are 4 dwelling units and 50' travel distance. Travel distance is defifned in 1016.1.
ICC 1027.1 Exit Discharge - Exceptions 1 and 2 for an exit discharge lobby are not applicable to a single exit building. It would require a two-exit or 3-exit building for this to be allowed.
You need to work from section 1021 to establish the number of exits. unless this section refers you to another section, the requirements of 1021.1 and 1021.2 cannot be modified. In general a single exit building must exit directly to the exterior.
John Karnes, Architect
4/12/2013 4:01:55 PM
Technically it would work like an exit passageway that extends the exit to the exterior of the building except that the elevator opens onto it. ie the "corridor" has no other openings to units, etc.
4/12/2013 4:20:52 PM
Thanks John. I was able to find that same statement regarding 1027.1 only applying to two and three exit buildings in our code with commentary book. Should have started there.
I think the solution may be to do a fire shutter over the elevator doors that is activated by the fire alarm. Nothing else opens onto the vestibule/lobby (its essentially a corrdior), so we could then treat it as an exit passageway rated to match the 1-HR stair enclosure.
2/28/2014 7:15:37 PM
"ICC 1021.2 Single Exits - Occupancies shall be permitted to have one exit if in compliance with Table 1021.2. For an R-2 occupancy, the requirements are 4 dwelling units and 50' travel distance. Travel distance is defifned in 1016.1.
John Karnes, Architect"
Regarding Travel distance defined in 1016.1, if R-2 units with two floors connected by and interior stairway, does the 1016 requirement for two means of egress for each floor still stand, or, since 1021.2 specifically states R-2 can have only one exit from the unit, is this requirement moot for R-2 use?
3/4/2014 8:34:02 AM
To clarify my question, Table 1021.2 allows second floor single exits for R-2 with up to 4 units and 50 ft of travel distance. Section 1021.2 states the limit is for the areas served by the exit. If the R-2 units exit onto a landing in an fire rated stairway, to an exit discharge, I read the section to say the area served by the single exit discharge is the stairway. Areas beyond the stairway, meaning the areas within the units, are not included in the travel distance calculation. So, as long as travel distance from the exit of the farthest unit on the landing is less than 50 feet from the exit discharge, the exemption is applicable.
Is this correct?