[bpape]

If it's dry, there should be no need. Standard carpet pad and carpet will be fine. If you have the height, budget, and want a bit of feel, you can use Dri-Cor over the concrete prior to carpet.

Bryan

 

[bpape]

Depending on how you're going to do the ceiling (clips and channel, green glue, etc.) the Safe and Sound may not do much of anything but spend money.

You certainly don't need the floor again depending on the isolation desires. It's more for feel and to help stop flanking through the slab.

Bryan

 

[bpape]

From an isolation standpoint, you're limited using drop tiles. The Roxul will help a little. From the standpoint of allowing the ceiling to be a large broadband bass absorber, it won't change much.

Bryan

 

[bpape]

Like I said, from a purely isolation standpoint, the Roxul will do a little bit better. From an in-room performance standpoint, not much - unless you can fill the whole cavity above the drop with std insulation rather than just say 4" of Roxul.

Bryan

 

[bpape]

That will work just fine.

Bryan

 

[bpape]

Good thought but it really won't do anything for absorption or for isolation. Just not the right material.

Bryan

 

[bpape]

Which are you trying to accomplish? Isolation? If so, one easy and relatively inexpensive way to go is to simply cut drywall and glue it to the underside of the subfloor above. That will increase the mass and reduce the transmission while only reducing the cavity depth for insulation by 1/2"

Bryan