07 Jun '12, 10pm

Follow up question about the roof. #green

I just posted a question about the wall cavity. I should have asked about the roof which consists of 2x12's 24" O.C. with 11-1/4" blown-in cellulose R-40+ then 1/2" CDX and over that 5-1/2" SIPS R-32. Over the SIPS I'm going to 1" strapping vertically and than 1/2" CDX to create a cold roof. I'll have over a R-70. My concern is with insulation in the framing cavity I might be letting the dew point move closer to the heated side of the house.

Full article: http://www.greenbuildingadvisor.com/community/forum/energ...

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