I wanted to insulate my attic. It has 1963 vintage kraft faced insulation...probably 2 to 3" think. It is in ratty condition (matted down, some areas breached from prior work in the house, etc). Am I better off pulling it all out and dumping in fresh kraft faced insulation? Or covering over the top with unfaced insulation. From the sheetrock to the top of the joist is 9". I also saw on a home show, a builder cut strips of poly plastic sheeting and layed it in each joist and covered with unfaced insulation. Not sure if that is worth the effort, but it supposedly unfaced is considerable cheaper in cost.