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Old 01-08-2012, 09:59 AM   #16
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Insulation condensation

Originally Posted by k.hinton View Post
I live in Ontario Canada in a city on lake Ontario. The foam is 2" thick
Not enough thickness when using EPS for up there.

You need a vapor barrier in this application. A non-perforated radiant barrier will do the trick as well as adding a layer of rigid foil faced iso or poly skrimmed XPS.

2" of EPS is not enough in this case (roughly R-7).



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