Hey all, I am struggling with what is probably a typical problem. My attic has a large area of plywood flooring underneath which is an inadequate layer of old, dirty and somewhat compressed fiberglass batts. I know in an ideal world I would tear up all the flooring and add several more inches of insulation. However, I don't really have the time to tackle such a project. Plus we are using some of this area as storage. I am wondering if adding a layer of polyiso on top of the plywood would be an effective way to add some r-value. I think polyiso could handle the weight of holiday decorations and such. Would adding rigid panels create any moisture problems since there is already a vapor barrier on the fiberglass? Also, could I just roll unfaced fiberglass batts over some of the plywood that I don't need for storage?