[Petee_C]

David,

You may find that 2 layers of Drywall (5/8" if u have the room) plus green glue may be cheaper than the OC Quietrock.... (at least Material wise)... I think that a 4x8 sheet of QR was in the $100+ range.

2 sheets of drywall should be about $30
1.5 -2 tubes of GG is $25-34

Total cost for 32sq ft = $55-64

Peter

 

[Petee_C]

If your starting from studs/framing, then the typical route is Roxul Safe'N'Sound for insulation but even fiberglass batt insulation will work. All cavities must be filled, no air spaces. Next up is RSIC clips/resilient channel typically,

Cheers,
Kaoru

Kaoru,

Good post. A couple points

- staggered stud walls may help to decouple the wall and can be an alternative to the RSIC clip/hat channel, or Isomax clip. It also might be the cheapest /bang for buck option. Figure on less than $2 / linear foot of wall space.

- each joist cavity (ceiling) , or stud cavity in wall should be treated. I don't believe ceiling joists need to be filled to full thickness, air spaces can be left in the ceiling. The RSIC / Isomax clips leave an intentional air space in HT construction.

- Air can be important in reducing noice (airlock / communicating door) entrance into a HT.