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Experts from the Department of Energy and Energy Star evaluate these materials based on their —the measure of thermal resistance. Insulation Type Typical R-Value (per inch) Key Advantage Spray Foam Performance & Air Sealing ~3.5 - 6.5 (Closed Cell) Unmatched air sealing Cellulose Filling Gaps & Irregular Spaces ~3.2 - 3.8 Eco-friendly (recycled paper) Fiberglass (Blown-in) Budget-Friendly Retrofits ~2.2 - 2.7 Easy to add over existing layers Fiberglass (Batts) New Construction/Empty Joists ~2.9 - 3.8 Precise and easy for DIY Expert & Community Insights

Frequently cited as the "gold standard" by specialists like SolarTech , it provides superior heat resistance and structural strength. However, it is the most expensive and usually requires professional installation. Cellulose: Recommended by many home improvement communities buy attic insulation

Buying attic insulation is one of the most effective ways to lower energy bills and improve home comfort. The best choice depends on whether you are prioritizing a , high performance , or budget . Top Attic Insulation Types Comparison Experts from the Department of Energy and Energy

are praised by reviewers at Rubcorp for their energy efficiency and ease of handling for standard joist widths. Important Buying Considerations Important Buying Considerations for its ability to densely

for its ability to densely pack into tight corners, though it can be dusty during the "blown-in" process. Products like Owens Corning R-38 Kraft Faced Batts