PDD Practice question- Party Wall
Hi all,
I need help to understand this question, I am not sure why the answer is A. regarding the requirements option C will be the correct answer, because it doesn't say in the requirement that each part will be 2 hours fire rated, and it says 1/2" gypsum (1 hour rated) so this will give us 2 hours for assembly (unless I misreading the question), also how can they attach the gypsum board inside the cavity?
Please see the question attached
Appreciate your help.
Best,
Dalia Nori
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I believe the 3rd bullet point is critical - if the wall is faced in gyp only on the interior/finished side, it will not run from exterior wall to exterior wall or from floor to roof sheathing. And given that each wall has to function independently, each 'side' has to have a 2 HR rating. I agree that the phrasing is confusing though.
Regarding constructibility, the cavity surface could be faced in gyp by sheathing that face on the ground before tilting up into place. Then tilt up, secure the top and bottom plate as typical, infill with batting, and sheath the interior side.
Hope this helps.
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These party walls aka partition walls will be what separates apartment units. Option A is one entire wall system. The air gap helps with the fire control as well as having a total of 4 layers of GWB in the assembly. Similar to this type of wall:
https://www.usg.com/content/usgcom/en/design-studio/wall-assemblies/assembly-detail.30221.html
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