Here's a great site that enabled me to find 3 local dealers of neoprene rubber rolls/sheets of 1/2" 80 durometer rubber to float the floors. Hope this will be of help to others:
http://www.rubber-ez.com/rubber/0056068 ... 3_101.html
NEOPRENE RUBBER SEARCH SITE
Originally posted at johnlsayers.com, topic 899.