❓ FAQ
+What R-value do I need?
Depends on climate zone. Attics: R-30 to R-60. Walls: R-13 to R-21. Floors: R-13 to R-30. Check your local energy code.
+Which insulation type is best?
Batts: cheapest, DIY-friendly. Blown-in: best for attics. Spray foam: best air sealing + highest R per inch. Each has its place.
+Does old insulation need removal?
Usually no — you can add new insulation on top. Exception: if it is wet, moldy, or contains vermiculite (potential asbestos source).
+Where does air really leak?
Top air leak spots: attic hatches, recessed lights, plumbing/duct penetrations, electrical outlets on exterior walls, and rim joists.