Cellulose Insulation (Blown-In)

Updated Mar 26, 2026

Recycled paper fiber insulation blown into wall cavities and attics. R-3.5 per inch. Treated with borates for fire/pest resistance. Dense-pack (3.5 lb/ft³) or loose-fill (1.5 lb/ft³). High recycled content.

TAGS

insulation cellulose blown-in recycled attic

DETAILS

density

1.5-3.5 lb/ft³

cost per sf

$0.40-$0.90

csi division

r value per inch

R-3.5

sustainability grade

SOURCES

🔗https://www.insulationinstitute.org/

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