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Below is standard construction for My Pa. area and it gets to 0 degrees here at times
Siding
1'2 exterior sheeting
tyvex ( house wrap" over exterior sheeting)
2x6 stud walls with 6" "R" 19 glass insul
vapor barrier on face of inside studs.
1/2" drywall
So check it out and make sure there is not 4' insul in the walls which would be "R" 13
Leah4 Not to depress you but you are in serious trouble. I can't believe that a building inspector would allow 'R" 13 for and exterior wall!! when the temps get to 0 degrees. If thats the case than you or anybody else there has been lucky. This 'R" 13 is NOT and opinion situation here. I don't care what anybody says here. Its to borderline on the "R" 13. Now lets go to summer and see how hard that home will be to Air condition.ooohhh
Insulation is not just about heating.
Is this an addition or a whole home?
I will give you and example hear on how codes and insulation can get fouled up.
Would you believe me If I told you it snowed and sleeted in Maryland in June! And a part of Maryland gets as much a 6 feet of snow every year. My wife use to live in Maryland Garret County Deep creek Maryland. So the codes Geo overlap is sometimes missed.
Sorry for the bad news. The old days they used 2x4 ext walls on new homes in the 50 and 60s back then its was rock wool blown in insulation which breathed more and it still had problems. The frosting on those walls usually too place inside the wall cavity's more. Also the wasn't a vapor barrier back then. The other difference was it was planking on the exterior and clapboard siding or asbestos brittle lap shingle style siding. All of this application let more air breath in the wall more and didn't trap any moisture because of no real vapor barrier.
Bottom Line hear 'R" 13 WILL not be right if your Geo reaches 0 degrees or even in the teens and mid 20s The map below doesn't completely address altitude which changes " 13 WILL not be right if your Geo reaches 0 degrees or even in the teens and mid 20s The map below doesn't completely address altitude which changes " vales in Geo's
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