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Thread: How to use table 508.4 IBC

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    How to use table 508.4 IBC

    Hi everybody, I am just getting started as a building inspector so I have lots of questions. My friend told me about this website so I figured I would post up.

    I am looking at the 2009 IBC table 508.4

    Lets say we have an S2 and an F1 occupancy. If I look at the F2 in the horizontal column and S1 in the vertical I get a 2 hour fire separation in a non-sprinkled building.

    Now run it backwards

    S1 in the horizontal column and F2 in the vertical and I get a dashed line.

    As far as I have ever seen a table should run the same both ways? I don't see any explanation on how to run the table, and I don't see it in the commentary book either. I also don't see a dash defined anywhere?

    Again I am very green at this so I am sure I am just missing something. But thanks for the help.

    DLC

    PS I am assuming this is in the correct section because that is the book I was referencing.

  2. #2
    Sawhorse north star's Avatar
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    = ~ =
    DLC,

    Welcome to The Building Codes Forum!

    You have mixed different occupancy groups in your example.
    [ "S2 & F1"..........
    and..........."F2 & S1" ].........Please clarify some
    more.

    I have always read down in the first column and then across
    to find the fire rating application.

    = ~ =


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    i've understood that to be a "it doesn't work", we're stillin 06, it's the same table, differenrt heading, welcome aboard, the questions never stop, nor does the learning

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    The dashed line is there to show where not to look. You only look at the area that has a reference 1hr, 2hr, 3hr, 4hr, no separation, and not permitted.

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    Welcome and enjoy the forum

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    Sawhorse north star's Avatar
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    ~ + ~
    We kept the `03 Table when we adopted the `06 I-codes family.
    It is more restrictive, but it is also easier to understand and apply.
    ~ + ~


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    Quote Originally Posted by gbhammer View Post
    The dashed line is there to show where not to look. You only look at the area that has a reference 1hr, 2hr, 3hr, 4hr, no separation, and not permitted.
    Maybe that's the answer right there. So am I understanding the dash is there to keep you from getting the other alternative answer?

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    Oh and thanks for the well wishes, it's appreciated. I got A LOT to learn....

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    Sawhorse
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    Come on in the water is fine

    Suggest you attend as many code classes as you can

    Welcome, from still code confused


    Do you want to say what state you are in??

  10. #10
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    Quote Originally Posted by DLC View Post
    Maybe that's the answer right there. So am I understanding the dash is there to keep you from getting the other alternative answer?
    you got it now.

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    Administrator fatboy's Avatar
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    Welcome to the forum DLC, wealth of info available here.
    Arguing with an inspector is like wrestling with a pig in mud, pretty soon you realize that the pig is enjoying it!

    This response brought to you by one of the paying members of the Building Code Forum.
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    Quote Originally Posted by DLC View Post
    Maybe that's the answer right there. So am I understanding the dash is there to keep you from getting the other alternative answer?
    It makes sure there is only one answer.

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    Very good guys. I am in Wa. Thanks for all the help. I'm sure you'll all be hearing from me soon =)

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    Sawhorse
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    Welcome DLC

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    Welcome my son, The Table is no longer redundant. You start with the first category alphabetically and then scan across until you find the second. The answer is the answer.

    All the dashes down below simply mean that the answer has already been provided. Would suggest it might be worthwhile to spend some time in the commentary.

    Good Luck.

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