30 Apr '12, 5pm

Green Building Q&A: Will Bin (shellac based primer) over 1.5" of 2 pound foam over 6" of polyiso in 2x10 rafter

In a Massachusetts coastal home I have 6" of polyiso in the rafter bays. If I spray 1.5" of 2 pound closed cell foam I get close to a vapor barrier. Will painting/sealing the cured foam with a shellac based primer (like Bin or Killz) give the code required warm side vapor barrier?

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

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