Fire rating? Where can I find these info in AGS or IBC?

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    Michelle Gonzales (Edited )

    Hi Jingyu,

    The main difference between the partitions lie with the GWB, which is under finishes. In Chapter 9 - Finishes of AGS, there is a table that explains the different types of GWB and the different uses. They also show different partition types for fire ratings. I have the 10th Edition of AGS but it should be the same chapter in all editions since AGS tends to organize their chapters, for the most part, to mimic CSI MasterFormat (e.g. gypsum wall board is division 9 so its info is in Chapter 9).

    I hope that helps. 

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    Jingyu Lee

    Thank you so much, Michelle, it is on Chapter 12 for the 12th edition. Probably because I am A type person... I still cannot find the magic table or equation to determine what determines 2hr rating. How do I know choice A or C is not 2 hr rating? It seems it could be per ASC...?

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    Michelle Gonzales

    I


    Wow...now I know your pain. Not sure why the writers of ASC messed up such a good format. Here are the charts i spoke about... I highlighted the 1” Type X that is used for shafts. 

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    Jingyu Lee

    Thank you so much, Michelle! I cannot believe this chart is not in the 12th edition. I will use your chart over and over again in my career!! Thank you

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    Chelsea Hoffman

    USG's website might be helpful to look at as well. Granted there are an overwhelming amount of wall types, but you can use the filters on the left to help sort through different wall types and fire ratings.

    http://www.usgdesignstudio.com/wall-selector.asp

     

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    Scott Barber

    I also used USG to get a better handle on fire and acoustical ratings before I took PDD. I just googled "partition fire ratings" and used the first PDF that came up. It may not be as in-depth as what Chelsea shared above - may or may not be a good thing...

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    Chelsea Hoffman

    Agreed. The link I posted is something I'll use at work when I need to know what UL to reference for an assembly. I do like how it breaks down the different components though. There's just A LOT of different wall types it might be too overwhelming to actually study.

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    Jonathan Chertok

    the reference michelle was kind enough to post (12.4 in 15th ed of AHPP) is quite helpful for this. basically one needs over 1” of thickness each side (as in 1 1/4” from 5/8 + 5/8). the insulation and wood or metal stud is wholly ignorable (presumably as long as it is nominal 4” thick).

    for instance the reference shows the following for 1 hour fire rated wall combos (gyp each side with 2x4 wood stud wall or metal stud equivalent). which would not meet 2 hour rating of course:

    1/2 + 1/4 = 3/4”
    1/2 + 3/8 = 7/8”
    5/8 + 1/4 = 7/8”
    5/8 + 3/8 = 1”

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