Loose-fill
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Blown Insulation for Attics: Fiberglass vs. Cellulose
Both perform better than batts and are less expensive than spray polyurethane. Neither is perfect.
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How to Install Cellulose Insulation
Insulation expert Bill Hulstrunk provides detailed instructions for blowing loose-fill cellulose on attic floors and dense-packing walls
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Blown-In or Loose-Fill Insulation
Fill the Whole Framing Cavity — Even Irregularly Shaped Ones