Understanding R-Value
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Description
| Insulation is rated by its R-value, which measures its thermal resistance or how well it holds back heat. The higher the R-value, the better. Bare concrete walls are about R-1, while attic insulation in newly-built Midwestern homes usually measures about R-44. R-value is proportional to the insulation's thickness, but it also depends on the type of material and its density. The more air pockets an insulating product has, the higher the R-value. For example, R-38 attic insulation may be 12 inches of fiberglass batts, 10 inches of rock wool loose-fill or seven inches of expanding foam. Type of insulation: Cellulose R-value per inch: 3.2-3.8 Inches needed for R-38: 10-12 Fiberglass R-value per inch: 2.2-2.7 Inches needed for R-38: 3.0-3.3 Rock Wool R-value per inch: 14-17 Inches needed for R-38: 11.5-3 |
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Understanding R-Value
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