Loose-fill thermal insulation settles over time, causing a decrease in thickness and changes in density and thermal resistance. An experiment was conducted to study how settling affects the thermal resistance of materials like mineral wool and cellulose. Results showed that the settling of loose-fill insulation materials can impact their thermal resistance, as measured by ISO 8302 standards for rock, glass wool, and cellulose. The study did not explore how humidity affects the materials' thermal conductivity.