Independent/foreign ? Quiet like Run Lola Run or Pulp Fiction or .........
my point is: indie and foreign are just as noisy as any movie. Part of your job is to insure that your guests/clients/viewers get the movie they paid for and not the loud parts of the movie in the next room.
You have to stoip the film sound from coming through. Is there a drop ceiling. What is the ceiling?
If it's a sheet rocked/permaent ceil you should be okay and if you are not you can always shoot foam. Build it. Crank the tunes and see if you can hear it in the next room. If you can. You need more.
twin seperated walls of 2x4 with fiberglass insulation , 2 layers of sheetrock on each exterior wall, one dead airspace between the two walls, and caulk all cracks should do it.
If you are going to spend all the money to build a theatre don't cut it short on the sound materials.
Michael Hurley
Impresario