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Comparing insulation value
Adding insulation? Check the material’s R-value — the insulation’s ability to resist heat transfer. R-value depends on material, thickness, and density. A higher R-value indicates more effective insulation, saving energy dollars. Compare R-values and common uses for several types of insulation:
| Type of insulation | R-value per inch (range) | Common uses | Installation method |
|---|---|---|---|
| Batts. Rolls | |||
| Fiberglass | 3.17 (3.0-4.0) | Wall, floor, and ceiling cavities | Fitted between studs, joists, or rafters |
| Rock wool | 3.17 (3.0-3.7) | Wall, floor, and ceiling cavities | Fitted between studs, joists, or rafters |
| Cotton | 3.2 | Wall, floor, and ceiling cavities | Fitted between studs, joists, or rafters |
| Loose, Poured, or blown | |||
| Fiberglass | 2.2 (2.2-4.0) | Ceiling cavities | Poured or fluffed, or blown by machine |
| Rock wool | 3.1 (2.8-3.7) | Ceiling cavities | Poured or fluffed, or blown by machine |
| Dry cellulose | 3.2 (2.8-3.7) | Ceiling cavities | Blown by machine |
| Wet-spray cellulose | 3.5 (3.0-3.7) | Wall cavities | Sprayed into cavities |
| Perlite | 2.7 (2.5-4.0) | Hollow concrete block | Poured |
| Polyurethane | 6.2 (5.8-6.8) | Wall and ceiling cavities | Foamed into cavities |
| Open-cell Isocyanurate (IcyneneTM) | 3.6 | Wall and ceiling cavities | Foamed into open or closed cavities |
| Magnesium silicate (Air KreteTM) | 3.9 | Wall cavities | Foamed into open cavities |