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Dead end corridor within mixed occupancies

Discussion in 'Commercial Building Codes' started by tuzi, Jul 24, 2018.

  1. tuzi

    tuzi Registered User

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    I have a floor plate with R2, S-2, and A-2. The aggregate area of S-2 and A-2 are over 10% of the floor plate. If I take the floor as un-separated occupancies, then I know I have to follow 20' dead end as A-2 is the more stringent. I am wondering if I separate A-2 from the rest of the floor with 1-hour fire barrier with 45 min. door, does it mean max. 50' dead end corridor for R-2 will apply or it's not the case unless aggregate area of S-2 and A-2 is under 10%?
     
  2. RLGA

    RLGA Sawhorse

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    If a corridor is serving an assembly occupancy, then you're limited to the 20-foot limit on dead-end corridors, regardless of whether or not the assembly occupancy is an accessory use. Accessory uses are still classified per the applicable occupancy group, the main exception is that you do not have to separate the accessory occupancies from the main occupancy, but all other code provisions applicable to those accessory occupancies are still required.
     
  3. tuzi

    tuzi Registered User

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    [​IMG]
    The corridor I circled only serves the R2, does it mean it could be max. 50 ft, although I have A-2 on this level?
     
  4. RLGA

    RLGA Sawhorse

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    The image didn't come through, but if the corridor is only serving the Group R, then yes, the longer distance for a dead end corridor would be permitted.
     
  5. tuzi

    tuzi Registered User

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  6. cda

    cda Sawhorse

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    You either have to be a paying Sawhorse to post direct

    Or turn it into a link and post the link
     
  7. cda

    cda Sawhorse

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    While waiting for the floor plan.

    Where your concern is with the dead end,

    Are you required two means of exit ??
     
  8. tuzi

    tuzi Registered User

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  9. cda

    cda Sawhorse

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    Add a door across the corridor in the dead end.

    Not sure if you put it on a mag door holder, if it is still legal????
     
  10. tuzi

    tuzi Registered User

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    That's what I did now, but I just wonder if code allows without the door.
     
  11. cda

    cda Sawhorse

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    So what is the measurement of the dead end??
     
  12. tuzi

    tuzi Registered User

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    [​IMG]


    I am at 48'-6". I can reduce it to under 20' by adding a door in the corridor.
     
  13. cda

    cda Sawhorse

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    Which edition of IBC?
     
  14. cda

    cda Sawhorse

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    Looks like as said by RGLA

    Corridor used by assembly

    20 ft max or widen the dead end portion
     
  15. tuzi

    tuzi Registered User

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    2015IBC
     
  16. tuzi

    tuzi Registered User

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    Yeah, I think I need to add the door.

    Thanks, everybody for helps!
     
  17. cda

    cda Sawhorse

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    You know you can become a Sawhorse and support this great site

    We have the unlimited plan, keep asking questions till you get an answer you like!!!
     
  18. Builder Bob

    Builder Bob Sawhorse

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    Why can't you shift the doorways 20 feet forward and increase the apartment square footage?
     

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  19. tuzi

    tuzi Registered User

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    I guess that is possible, too. Thanks,
     
  20. mtlogcabin

    mtlogcabin Sawhorse

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    I assume the entire building is sprinkled so you get the 125 ft of common path of travel that would be permitted and not the 75 ft limit without sprinklers
     

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