Cellulose loose-fill insulation has an R-value per inch of approximately what?

Cellulose loose-fill insulation has an R-value per inch of approximately what?

• A. 3.7
• B. 2.7
• C. 1.5
• D. 5.0

Answer: (A)

R-value per inch expresses how much resistance to heat flow one inch of insulating material provides. For cellulose loose-fill insulation, the typical value is about 3.7 per inch, meaning each inch adds roughly R-3.7 of thermal resistance. Use this to estimate total performance by multiplying thickness by 3.7 (for example, 8 inches gives about R-29.6). This value reflects cellulose’s ability to fill cavities and reduce air leakage when blown in, which enhances its effective insulation. While the exact number can vary with density and installation, 3.7 per inch is the commonly cited approximation for this material.

R-value per inch expresses how much resistance to heat flow one inch of insulating material provides. For cellulose loose-fill insulation, the typical value is about 3.7 per inch, meaning each inch adds roughly R-3.7 of thermal resistance. Use this to estimate total performance by multiplying thickness by 3.7 (for example, 8 inches gives about R-29.6). This value reflects cellulose’s ability to fill cavities and reduce air leakage when blown in, which enhances its effective insulation. While the exact number can vary with density and installation, 3.7 per inch is the commonly cited approximation for this material.