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Good call, but I'm installing flooring up there
I actually had a nice blown-in layer up there, but my wife wants more storage space... I've always heard that one should use rolled under flooring. What I ended up doing is buying the 23" R-19 and ripping it straight down the middle (actually not nearly as bad a job as I thought). Tomorrow, I'll go back over with a perpendicular set of joists, and another layer of R-19, then put in the floor boards.
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