Loose-Fill Fiberglass insulation
Photo: David Hamsley
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Loose-Fill Fiberglass

Fluffy bits of spun glass that are noncombustible and can't decay. Blown in dry. Tends to settle. R-value declines by as much as 50 percent at temps below 0 degrees F.

Good for: Attic insulation, new construction, or retrofit work
R-value per inch: 4
Vapor barrier needed: Yes
Cost: 21¢ per sq. ft.
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