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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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