I came across this site in looking for soundproofing materials for my upcoming HT addition. The new room will be on the second floor of my home and I was concerned about sound leaking through the subfloor to the rooms below. The company is Quiet Solutions and their website is
http://www.quietsolution.com. I spoke with their reseller in my area and he said the Quiet Wood product (4’X 8’ T&G subfloor/roof material) was especially good. They also make a sheetrock product (Quiet Rock) that is good for adjoining room soundproofing. It is a little spendy but might be worth checking out if keeping sound in or out is necessary.
Update;
Saw something about Green Glue (audioalloy.com) on another site. Looks good if you believe their data.
