What is the R-value of loose fill perlite insulation per inch?

Loose fill perlite insulation typically has an R-value of approximately R-2.4 per inch. This value reflects the thermal resistance properties of perlite, which is made from volcanic glass that has been expanded and processed into a lightweight material. Its effectiveness as an insulating material is due to the air pockets trapped within its structure, which slow down heat transfer.

When considering the R-value of insulation, it’s essential to understand that a higher R-value indicates better insulating efficiency. While some other insulations may have lower R-values, perlite's position at around R-2.4 suggests that it offers a substantial level of thermal resistance, suitable for various applications.

Other options provide values that do not align closely with perlite’s established R-value, showing that while they reflect general ranges for different insulation types, they do not accurately represent loose fill perlite specifically. Recognizing the precise R-value of materials like perlite is crucial for effective insulation design and energy efficiency in buildings.