In a message dated 4/25/2006 10:25:03 A.M. Eastern Standard Time,  
[log in to unmask] writes:

I  agree--closed cell won't breathe so it serves as a moisture barrier.   
Make sure you know where your dew point will be (where in the wall  condensation 
will occur) to avoid letting moisture come in contact with wood  or concrete


In my former capacity, we always insisted that backer rod for  caulking be 
closed-cell polyurethane foam, because outgassing from the open-cell  stuff had 
been found to percolate out through the sealant and ruin it.  Why  isn't there 
going to be some deleterious effect (on paint?) of open-cell  polyurethane 
insulation?
 
Seems to me there's an inconsistency between Bruce wanting  open-cell 
polyurethane insulation and me wanting closed-cell backer rod.   Or am I missing 
something?
 
Ralph

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