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
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 buy attic insulation
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 Experts from the Department of Energy and Energy