Attic Insulation 2026 — Blown-In vs Batts vs Spray Foam Comparison
Three types of attic insulation. Blown-in is easiest retrofit. Batts are cheapest. Spray foam is best but most expensive.
Most California homes built before 2008 have under-insulated attics. Three retrofit options. The right choice depends on your budget and access.
Quick Comparison
| Pick | Best For | Approx Price |
|---|---|---|
| Blown-In | Owens Corning AttiCat Expanding Attic Insulation | $30-$50 / bag |
Our Picks
Blown-In Cellulose
Best for retrofits with limited access. Settles around obstacles. Achievable R-value: R-30 to R-49.
Fiberglass Batts
Cheapest. Works for new construction or open-access attics. R-value depends on thickness.
Spray Foam
Best R-value per inch. Air sealing built-in. Most expensive. Pro install required.
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Frequently Asked Questions
Cheapest option?
Fiberglass batts (~$1.50/sqft material).
Best for retrofits?
Blown-in cellulose. Owens Corning AttiCat is the consumer DIY brand.
Spray foam worth it?
For high-end energy efficiency, yes. Cost-prohibitive for most retrofits.
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