Plans Approver
Silver Member
A fully sprinklered, 2 stories plus basement, B use group, complies with all code sections except (maybe): 06 IBC 1024.1, Exceptions 1 & 2.
1024.1 Exits shall discharge directly to the exterior of the building. The exit discharge shall be at grade or shall provide direct access to grade.
Exception 1 allows a maximum of 50% of the exits to discharge through areas on the level of exit discharge when meeting the 3 sub-exceptions (basically a lobby). In this case, the exit stairs are unenclosed per 1020.1, Exception 9 from 2nd to 1st floors, basement stair enclosed w/ discharge at grade.
How do unenclosed stairs meet the requirements of 1024.1 or Exception 1 without some type of enclosure for the 2nd stair w/o making it an exterior stair or using a vestibule?
Would you permit both a lobby and a vestibule? 50% of exits to each? (I think I would.)
1024.1 Exits shall discharge directly to the exterior of the building. The exit discharge shall be at grade or shall provide direct access to grade.
Exception 1 allows a maximum of 50% of the exits to discharge through areas on the level of exit discharge when meeting the 3 sub-exceptions (basically a lobby). In this case, the exit stairs are unenclosed per 1020.1, Exception 9 from 2nd to 1st floors, basement stair enclosed w/ discharge at grade.
How do unenclosed stairs meet the requirements of 1024.1 or Exception 1 without some type of enclosure for the 2nd stair w/o making it an exterior stair or using a vestibule?
Would you permit both a lobby and a vestibule? 50% of exits to each? (I think I would.)