PLEASE DISREGARD THIS QUESTION: I'M AN IDIOT
I made a real bonehead mistake, and after some crawling around and prying
things apart, I see I was wrong about the 2 floor assemblies; the ceiling in
the basement IS the subfloor of the upstairs.
Sorry about that, everybody, but thanks for looking at the post and being
willing to help.
Complete (and I mean COMPLETE) Newb
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