Originally Posted by katzak
For that matter, the sheetrock ceiling should be cut and removed for the top framing.
not neccessary. Depending on which way the rafters run inthe ceiling, you can cause the drywall to sag. Really what your suggesting would do more harm than good. Since the drywall is permanent, the new framing can attach directly to it, A stud finder will locate the studs, and the new wall would be secure.