My 2 cents:
A decoupler mat would help with the sound and give some air insulation as well. Sound travels through surfaces as much as pure air. A decoupler will usually have a hard vinyl sheet and closed cell foam layer. that combined with the hard surface the sound waves (noise) will be broken down and "decoupled" from the floor and frame. This is not the dynamat stuff. the dynamat type products are a barrier not a decoupler. barriers are good for some things too, but a decoupler would give you the double benefit on the floor. At the very least, put it between the joists and the subfloor.
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Doc Weaver '98 Freightliner FL60 pseudo toy hauler
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