Ted White
07-04-08, 10:23 AM
This comes up from time to time so I thought I'd post some data.
http://irc.nrc-cnrc.gc.ca/pubs/fulltext/ir766/ir766.pdf Courtesy of the NRC in Canada
http://www.soundproofingcompany.com/upload/IR-766.gif
Note that there's not much performance gain after R19
http://irc.nrc-cnrc.gc.ca/pubs/fulltext/ir766/ir766.pdf Courtesy of the NRC in Canada
http://www.soundproofingcompany.com/upload/IR-766.gif
Note that there's not much performance gain after R19