Cellulose insulation
Photo: David Hamsley
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Made from pulverized newspapers and treated with boron to resist fire and pests. Blown into place dry or wet. An adhesive reduces its tendency to settle.

Good for: Retrofit work, attic insulation
R-value per inch: 3.8
Vapor barrier needed: No, if packed to a density of at least 2.6 lb./cu. ft.
Cost: 17¢ per sq. ft.
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