SAMPLE QUESTION 6-PDD

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7 comments

  • I think this sample question is getting at to test your understanding on different types of materials and how you should use them appropriately.  A shaft wall liner is the inappropriate material in this instance because it is separating a lecture hall and a hallway, not a hallway and an elevator shaft, or a lecture hall and a mechanical shaft.  Also, you might want to look up on YouTube the installation methods of shaft wall gypsum board and maybe that can shed some light also to why this material is inappropriate in this instance.  The wall thickness is of the shaft wall is 6 1/4" vs 6 1/8 of option C, resulting in a minimal wall thickness and keeping the 2 hour rating.

    I hope my explanation helps!  

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    StephenF

    Shaft walls only have one finished side that can be taped and mudded. The other side is left unfinished where the 1" liner panels slide between the "H" legs of the metal stud. It's only used where one side is not visible to the occupants.

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    Meredith Guy

    Thanks so much for everyone's help!  That makes sense!  

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    George Kreatsoulas

    How are we supposed to know that this is a shaft assembly based on the picture? I guessed and got the correct answer just based on the thickness of each total wall assembly not based on the rationale given by NCARB.

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    Theodore Diamond

    The 1" gyp. bd. and them joint shown between the panels on the shaft side, as well as using the two layers of 5/8" gyp. bd. on the other side are dead giveaways for a shaft wall.

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    Jingyu Lee

    Theodore, Could you explain a little further? "The 1" gyp. bd. and them joint shown between the panels on the shaft side, as well as using the two layers of 5/8" gyp. bd. on the other side are dead giveaways for a shaft wall." Is this based on work experience? Which literature (IBC or American Graphatic Standard) show that this is shaft wall?

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    Theodore Diamond

    This is primarily from work experience.  I have usually found this construction in UL books (which I realize aren't part of the study materials).  A good way to familiarize yourself with this is to look through USG and other manufacturer's materials.  They will provide the testing that their construction meets.

    AGS has a pretty good section on Gypsum Wallboard Construction, which gives a really good overview of this, as well.

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