Insulation Industry Knowledge & Tips | Rosewool Insulation
Jan 12. 2026
Is the external wall insulation composite aluminum foil rock wool board 20mm thick? The composite aluminum foil rock wool board (20mm thick) is an insulation board made of high-density hydrophobic rock wool as the core material, with one or both sides covered with high reflectivity aluminum foil (usually embossed aluminum foil). It is commonly used for thermal insulation, moisture prevention, and energy conservation in areas with limited space.