Recent Review: A two-man crew took down the deterorated, bag enclosed rock wool insulation from a 9' X 35' attic wall and added the rock wool across the same type attic floor insulation. The deteriorated paper bags were removed from the attic. Fiberglass, R-19 24" KRAFT BATT insulation was then placed on the wall. The crew then filled in any gaps found around the HVAC system with the same fiberglass insulation. After three months of operation I can say that the amount of dust (rock wool) escaping the attic has been nearly eliminated, thanks to the extra effort of the installers.