WEIGHT OF CELLULOSE INSULATION BLOWN-IN OVER …

You stated that you would like to increase your R-value to R-38. Your current R-value with the 2-1/2" of cellulose is approximately R-8. Therefore, you would need to add an R-30. This would be adding approximately 8-1/4". The weight ratio per square foot of 8-1/2" of cellulose is usually .97 pounds per square foot. ................
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