PPD: Code Check for Exit Requirements

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2 comments

  • Avatar
    Luis Vargas

    question 1, the door appears to be in the middle of the office wall, and F occupancy would be the most stringent. I say is 75' max Common Path of Egress Traver

    question 2, same as above 75' max.

    question 3, you are allowed to have to 4 dwellings to share one single stair. with a max TD 125'. 

    question 4, 30ft distance : looks like they want a corridor between the stairs no larger than 30ft, limiting the  diagonal up to 120' for two stairs....

    not familiar with hi-rise but I do a lot of commercial and I use the 75' max in an small 2nd floor with a single enclosed stair all the time.

    hope this helps

  • Avatar
    Tsai Tse Josh Lo (Edited )

    Luis,

    Thanks for your inputs, and appreciate the conservatism approach. Sometimes things are just not so black and white when it comes to code. Below are my two cents.

    I'd welcome more people to weigh in...

     

    Question #1.

    - I'll first check the occupant loads of "F" and "S" to see if 1 exit door is allowed for these rooms. If 2 doors are needed, I think 2 doors should be provided for room "B" that is further downstream. If 1 door suffice, I'll take the next and following step...

    - See if 1 exit door is allowed for room "B" by checking the cumulative occupant load (B+F+S) against the max. allowable for "B" (which is 49), and by checking the common path in room "B" against the max. allowable for "B" (which is 100 ft).

    - If 2 exit doors are in fact needed for room "B", I'll go back and check the common paths in rooms "F" and "S" against the max. allowable (which are 75 ft and 100 ft respectively).

    *In reality, I think the model shop and storage being accessories to the office shall be classified as "B" occupancy as well.

     

    Question #2.

    - I'll check the travel distance for each room with the max. allowable for each occupancy which are 75 ft for "B" and 100 ft for "S".

    *In reality, I think the storage being an accessary to the office shall be classified as "B" occupancy as well.

     

    Question #3.

    - Looking at the code, seems like an individual dwelling unit needs 2 exit doors if there is only 1 exit stair serving the story it is in. Is your interpretation the same?

     

    Question #4.

    Believe the 30 ft exit stair remoteness requirement is in addition to (not in leu of) the 1/2 diagonal exit separation requirement. Typical diagonal of an office building is around 200 ft.

    I think the remoteness requirement is related to the destruction of stair shaft, rather than blockage of exit. 

     

    Thanks,

    Josh

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