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i would like to know what the pro's and con's are of installing 4 mil or 6 mil poly over fiberglass insulation with or without kraft face?

i recently purchased an an old home that has 2" x 4" studs for exterior wall framing. i want to know what you recommend for maximizing energy at a reasonable cost. thank you.

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Resolved questions:

» In my attic some of the trusses are a little further apart than the batt paper will reach to - i can staple one side, but not the other. what's the best way to keep the insulation up? a specific tape?

» Where should I put the vapor barrier in my basement wall? I live in Oregon (cooler), which side of the insulation, the warm side or cool side

» Adding more attic insulation. What type should I use?

New unresolved questions:

» Moving insulation up to rafter cavity - do i need a separate vapor barrier?

» I need to know sr ft per bags of insulation

» New addition, any benifit using 2x8s for walls? also can i wrap exterior,use faced insulation,& add plastic sheeting inside?

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