You still want the walls to be structurally sound. Yes, some flanking sound will go along the ceiling joists between the two walls, but unless someone uses clips to isolate the walls from the ceiling:


I didn't do this and I am very happy with the soundproofing with my staggered stud wall for 2 of my walls (the other 2 were basically double walls with the inside studded and the outside concrete with a 3 inch gap). I then focused on decoupling the ceiling, and doing double drywall and greenglue. If I could prevent a lot of the noise from even getting to the ceiling joists, then it wouldn't matter for the flanking sound. It too seems to work well.

So long story short, nail those suckers in at this point. Short of starting over and using those hangers, the walls are touching the joists anyway.

Farewell - June 4, 2020