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Instructor, ex-contractor
Trade:
Construction trades Instructor
Join Date: Nov 2008
Location: Northumberland, Pa
Posts: 86
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You're on the right track, guys. A minimum of 1" rigid Dow or equal in combo with a 2x4 wall frame filled with r-13 glass can move the 37 to 40 degree occurence somewhere into the rigid foam layer, eliminating most dew point condensation which would otherwis occur in the fiberglass. With mold/mildew/athsma/allergy litigation building momentum on us, it is wise to learn all you can about levels of vapor retarders; and when and where to use them. Check out buildingscience.com or something like that. Just google buildingscience and you'll find it. Then go to Mold Control.....BTW insulated siding is a joke!
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