Cellulose loose-fill is best compared to fiberglass loose-fill because both offer the benefit of more effectively sealing the building envelope from heat transfer. Cellulose tends to offer a better R-value per inch (see chart below), and it is not a possible carcinogen. It also boasts some environmental credentials above those fiberglass can claim: it has a greater percentage of recycled content, its manufacture is about 8 times less energy-intensive and, when it is removed from a house frame, it can theoretically be composted. However, cellulose tends to be more expensive, and its installation can be more labor-intensive than that of fiberglass blankets. It’s especially important to ensure proper installation of sprayed-in cellulose because if it is left too wet, mold, mildew and even rot can form in the house frame.

Comparative Chart

Prices for the material and installation of fiberglass and cellulose vary so much by region and contractor that a price comparison is impossible. Ask your local contractors for their rates and compare carefully.

For more information, please read this pdf.file, a publication of the Department of Energy that compares various types of loose-fill insulation:

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