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This question cannot be answered without knowing the specific brand of insulation. There is no such thing as a generic coverage chart for any loose fill insulation--cellulose or fiber glass. For cellulose, R-factors range from about 3.7 to about 3.9; density ranges from about 1.3 pcf to 1.8 pcf, and bag sizes range from 18 pounds to 40 pounds. All these factors affect coverage.

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Q: How many bags of cellulose insulation for 216 sq ft?
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