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Faced or unfaced attic insulation. Climate zone 3.

1367 Views 8 Replies 4 Participants Last post by  carpdad
I am in climate zone 3. North of the warm-humid line. I am insulating an attic. Should I use faced or unfaced insulation? Unfaced is less than faced, so I'd like to go that way, if possible.
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Thinking about it over the years, if I had to do thing over, I would use faced. Face down touching the drywall below then 2nd layer facing up. Face paper is supposed to be a vapor barrier but with proper air seal and acrylic paint used now, how much moisture from below? With proper air management above, how much moisture from above and outside? My reasoning is that fiberglass insulation will be more efficient with less air moving through it with kraftpaper left on. At most, few cuts would let the moisture out?
My problem with articles like it is that it talks a lot about the walls which is a different install from attic insulation installs. It's all about how vapor may travel but attic is different from air sealing the walls. I know that if I left the face paper on top it can trap the moisture in the air and condense into water, but air flowing over the insulation seems to be a problem too. It's like we're giving up on attic air problem because drying out is more important?

I still have to add some insulation in my attic. How about if I added unfaced insulation and loosely cover the insulation with something like tyvek? Would tyvek allow drying out? I'm not looking for the absolutes, btw.:smile: I also plan to run the attic vent fan which increases the air movement.
"reduced value calculated in", paraphrased, is a new info. That was easy enough.:smile: Again, thanks.
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