rigid insulation and vapor barriers

   / rigid insulation and vapor barriers #1  

randy41

Veteran Member
Joined
Jul 2, 2005
Messages
1,803
Location
Linden VA
this is a bit confusing to me. there are generally 2 kinds of rigid insulation. there's eps and polyisocyanurate. how do they deal with moisture? is eps unaffected and polyiso needs a vapor barrier? is the covering on polyiso a vapor barrier?
i am building a walk in cooler and researching insulation options. the rigid insulation will be used in conjunction with roxul. i read 2 articles online and they are contradictory.
 
   / rigid insulation and vapor barriers #2  
The foil insulation on the poly is a vapor barrier. It is best to foil tape any seams. EPS will let vapor pass through.

Ken
 

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