I failed to add that the gypsum will be applied directly to the floor joist and a suspended tile ceiling will be installed a couple feet below the gypsum. The gypsum, if not sealed at the joints could allow fire to enter the concealed joist space thus defeating the purpose of the gypsum. That's just what I envision but it may not pose a problem. My theory, however; will not be what he architect is looking for.
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