How to deal with an interior vapor barrier on a rigid foam retrofit.
I would like to add foam board to the exterior of my house to beef up the R value. The walls currently are 2x6 with fiberglass batts and plastic sheeting as a vapor barrier between the studs and drywall. Most of the stuff I've seen says you don't want a vapor barrier on the inside so your sheeting can dry to the inside but I haven't found much information on what to do if the vapor barrier is already in place. Thanks!
Posted Aug 28, 2014 1:16 PM ET
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