Cellulose high-density insulation has an R-value per inch of approximately what?

Cellulose high-density insulation has an R-value per inch of approximately what?

• A. 7.0
• B. 3.2
• C. 3.0
• D. 2.8

Answer: (B)

R-value per inch tells you how much resistance to heat you get for each inch of material thickness. For cellulose insulation installed as high-density or dense-pack, the typical rating is about 3.2 per inch. Dense packing reduces air movement and small convective loops inside the cavities, which boosts thermal resistance compared to looser fills, but it doesn’t push the per-inch value into the higher ranges seen with some other materials. So, per inch, you get roughly 3.2 in thermal resistance units. The other numbers don’t match common performance data for dense-pack cellulose: 7.0 would be unrealistically high for this material, while 3.0 or 2.8 are slightly lower than the standard 3.2 figure.

R-value per inch tells you how much resistance to heat you get for each inch of material thickness. For cellulose insulation installed as high-density or dense-pack, the typical rating is about 3.2 per inch. Dense packing reduces air movement and small convective loops inside the cavities, which boosts thermal resistance compared to looser fills, but it doesn’t push the per-inch value into the higher ranges seen with some other materials. So, per inch, you get roughly 3.2 in thermal resistance units. The other numbers don’t match common performance data for dense-pack cellulose: 7.0 would be unrealistically high for this material, while 3.0 or 2.8 are slightly lower than the standard 3.2 figure.