Replies

1. 
   john7g | Jan 21, 2008 03:29am | #1

   what gain are you aiming for?

   If you're looking for sound suppression you won't get very much from insul

1. 
   Ninecats | Jan 21, 2008 06:52am | #5

   Nothing to do with sound deadening, more insulation itself.  The foyer is about 15x30x20 high and not well heated or cooled, looking to maintain the conditions in the bedroom and video room

    

2. 
   clinkard | Jan 21, 2008 03:32am | #2

   Cats,
   Try roxul safe and sound insulation, a bit of a PIA to install, but deadens sound pretty quickly. The foam wrap on electrical outlets, switches with help to stop sound transmission.
   It should be pretty straight forward installation, although safe n' sound is terrible, use a mask and gloves, long sleeves etc.
   Good luck.

3. 
   USAnigel | Jan 21, 2008 06:18am | #3

   Each side of the wall should have its own stud system to prevent sound transmission. Next weave sound deadening material between the stud system. Next 5/8" sheetrock and finish. Should be effective at reducing noise transmission.

4. 
   DonK | Jan 21, 2008 06:43am | #4

   From what I've read in other threads, the sound can travel directly through the studs, so it's best to try to break the connection between the walls. You can use special rubber insulation as part of a wall system, or cross fir it. I've had pretty good results by cross firring with 1x3 on both sides and insulation in the middle. There are also  steel studs that can be used, but I prefer working with wood.

   Don K.

   EJG Homes    Renovations - New Construction - Rentals

    

5. 
   Riversong | Jan 21, 2008 07:04am | #6

   What problems?

   If the foyer is already poorly heated, then isolating it from the conditioned space will make it colder.  Perhaps that's not a problem.

   Since you're separating two at least partly conditioned spaces, you don't need a vapor barrier, and unfaced batts are always easier to install without voids than faced batts.

   You might also consider weatherstripping any connecting doors or at least installing a sweep to block airflow underneath.  This would make the foyer effectively an air-lock entry.