Top up your attic insulation in just 3 easy steps with Roxul RockFill Top Up Attic Insulation. There is no need to rent a blowing machine, just Open - Aerate - Spread to maximize R-value, increase comfort and lower energy costs. While your attic is probably insulated, over time, insulation can settle or compact, reducing its r-value. Or if your attic is breezy, insulation can drift and shift, leaving gaps where heat can escape. When installed, RockFill Top Up Attic Insulation won't move or settle over time. And, RockFill is made of inorganic stone wool and thus will not grow mould or mildew
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