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Aaron and Greg have put You onto some good info.

If You do use the RC channel remember to screw it to the studs through the edge with coarse thread drywall screws,,then,,use short fine thread(for metal)drywall screws to attache the drywall to the RC.That way if a screw does penetrate at a stud it does not also penetrate the stud. Any screw that goes through the drywall,through the RC,and then into the stud will make the drywall transmit sound. The screws going into light gauge metal might spin out easilly so be careful and do not leave a spun screw in place,remove it and try again nearby.

Ok,,now,,anybody want to build/drywall an X-Ray room?!?! LOL,,BTDT too! That leaded sheetrock is HEAVY!

I tried the underline feature for the 1st time in this post,,I tried to underline "does not".

Dean

[test] sorry

You might try covering the wall with acoustical tile (cheap and easy) If thats not enough then you will need to insulate wall, add sound board (acoustical tile) and redrywall. If thats not enough you will need another wall built inside existing wall using the same process.

Theres a product out called Roxul Safe & Sound. It is a Rock Wool mineral insulation that is not only a sound proofing barrier but also a firewall that slows fire from spreading. Its at Home depot.