I'm not trying to put down a vapor or wind barrier. I was thinking of putting down a sheet of something over the fiberglass insulation so that the cellulose doesn't crush it down. However, after being up in the attic quite a bit this weekend, I don't think thats really going to be necessary. The amount of cellulose I'm putting in will weight roughly 1.5 lbs per sq ft. I don't think that'll crush the fiberglass much and it won't be worth the trouble of putting something down to seperate the two.
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