Unvented roof deck with dense-packed cellulose — vapor barrier?
Hi I just dense packed my attic ceiling (it is a livable space, not crawl) with dense pack cellulose (8″), held in with insulweb. we put the cellulose right up against the roof deck. I am concerned whether I need a vapor barrier and where it should go. My plan was to just put rough cut wood (not tongue and groove ontop of it for the ceiling, but a few people who looked at it thought I might need a vapor or air barrier. The roof is not vented. Though I also need a new roof come spring, so possibly just putting a metal roof ontop of the old one will solve this – or they are two separate issues. I guess it is too ate to ask whether it is ok that it is against the roof deck. But before putting the wood up (I don’t have it yet and money is short), should I put plastic or tyvek up..? Any suggestions?
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