Loose-Fill (Blown-In)
Blown-in Cellulose Insulation
Complete guide to blown-in cellulose insulation: R-value, installed cost, pros, cons, and best applications.
Key Specifications
3.2–3.8
R-Value per Inch
$0.50–$0.80
Material Cost/sqft
$1.00–$1.50
Installed Cost/sqft
18"
Depth for R-60
Cost Analysis (1,200 sq ft Attic)
| Option | Low Estimate | High Estimate |
|---|---|---|
| Material only (DIY) | $600 | $960 |
| Professionally installed | $1,200 | $1,800 |
*Estimates for a full install to Climate Zone 5 R-60 depth. Use the calculator for your specific situation.
+ Pros
- ✓High R-value per inch (3.2–3.8)
- ✓Made from 75–85% recycled content
- ✓Excellent air-sealing capability when dense-packed
- ✓Fire retardant treated
- ✓Competitive installed cost
− Cons
- ✗Can absorb moisture if not properly installed
- ✗Settles 15–20% over time, reducing effective R-value
- ✗Heavier than fiberglass — check joist load capacity
- ✗Dust during installation requires respiratory protection
Best Applications
- →Environmentally conscious homeowners
- →Attics needing air sealing combined with insulation
- →Homes in moderate to cold climates
- →Top-up projects over existing insulation
Comparing Insulation Types
Blown-in Cellulose is a loose-fill (blown-in) insulation. With R-3.2–3.8 per inch, it is suited to applications where depth is not a constraint.
View full insulation type comparison →Explore Other Insulation Types
Is Blown-in Cellulose Right for Your Attic?
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