Q&A Forums
What is the REAL perm rate for sealection500 Post New Topic | Post Reply
| Author | Comments |
|---|---|
|
Posted: Aug 18, 2007 04:30 PM
|
What is the REAL perm rate for sealection500
I wish Demilec would just pick a number and stick with it..From the DEmilec usa website tech data page.. 3.6 perms for 2" http://www.sealection500.com/dem/s500/index.php?key=ProductSpec From the demilec usa website steel brochure 5.49 perms at 3" http://www.sealection500.com/dem/s500/index.php?key=brochures from demilec usa website, building science, 3.6 perms per inch http://www.sealection500.com/dem/s500/index.php?mod=content&id=56 from twinsulation.com 5.47 perms per inch http://www.twinsulation.com/tech.html from Cornel chemicals-- 97 perms! http://72.14.253.104/search?q=cache:dt7HcATemJ4J:www.cornellchemicals.com/SEALECTION%2520500%2520DS%2520anglais.pdf+sealection+perm+astm&hl=en&ct=clnk&cd=1&gl=us From Canada research council--- 25 perms per inch http://irc.nrc-cnrc.gc.ca/ccmc/registry/07/216/12697_e.pdf I'm trying to call BS on the "you wont need a vapor retarder" story from our local foam guys. When its as cold as my part of Colorado, every wall performs better with a vapor barrier. |
