Mary has been (im) patiently waiting for a task she can tackle in this rather huge project. Fortunately for me, one of those tasks is stuffing insulation everywhere—I hate dealing with the stuff. I still have to staple and trim it, though. Fortunately, as most of the basement is above grade, the exterior walls in the back of the house have already been insulated, which saves us time and money.
By insulating the ceiling, sound transmission between the floors will be minimal, especially with the 2×3 stringers partially decoupling the ceiling from the joists.
All of the walls in the theater are being insulated, with the exception of the HVAC return channels, and the walls where the pocket doors are. While the insulation here will help with sound transmission, I’m not going for a soundproof room. In our last house, the number of times the wife and I weren’t watching a movie together could be counted on one hand, so I have no concerns about keeping the sound in the room so as not to disturb other people in the house. While the noise floor would be significantly reduced in a soundproof room, improving the room’s performance, the aesthetic compromises that would be necessary are unacceptable to me due to the space/size/placement constraints I already have. And of course upon resale, as we’d never recoup the cost that goes into soundproofing, I’d never get the dollars past the family CFO—and I’m already sandbagging the budget on several fronts.