vapor barrier or no over existing?


Old 03-04-01, 09:55 PM
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getting ready to do the big insulation job this weekend. but, getting differing opinions as to faced or unfaced insulation.

currently, have very thin layer of "rock" wool insulation on attic floor. this insulation consists of white cottony looking stuff in the middle, encased in paper (all the way around). i don't plan on removing this. if i install over this, would this layer be considered enough for a vapor barrier? or do i still have to purchase insulation with a vb, to put over existing? also, there are some bare spots, with no insulation at all.

thanks in advance for your help.
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Old 03-05-01, 03:05 PM
Join Date: Mar 2000
Location: Arlington, WA
Posts: 9,238
Sounds like you are going with fiberglass batts. In that case, rake the rock wool out to cover the bare spots, getting it fairly uniform in thickness. Then lay UNFACED batts over everything. I think you would be better served blowing cellulose in, but that's just my opinion.

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