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GBlist: Re: vapor permeability of Icynene



The NAHB Research Center completed an Advanced Housing Technology 
Program case study of Icynene funded in part by the US Department of 
Energy in 1994.  The case study included computer modeling of 
moisture movement through conventional wall assemblies with Icynene 
as the cavity insulation.  In general, the vapor permeability of the 
wall assemblies with Icynene suggested that a separate vapor retarder 
was only indicated for regions with pretty cold winters (7500 or more 
degree days).  A vapor retardant primer paint included in the model 
with Icynene solved the issue for application in these cold climates. 
 It's tough to model moisture movement due to air infiltration, 
perhaps a bigger problem in wall assemblies than general moisture 
diffusion.  For a copy of the Icynene case study report, call the 
Research Center at (301) 249 -4000 and ask for Tami Baki and the 
Icynene AHTP case study report--there will be a nominal copying and 
handling fee.
Peter Yost
pyost@nahbrc.org
301-249-4000 x542
http://www.nahbrc.org
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