Thermal insulators when wet and dry?

Thermal insulators are materials that reduce the transfer of heat, and their effectiveness can vary significantly when wet compared to when they are dry. When dry, materials like fiberglass, foam, and wool provide Excellent insulation due to trapped air pockets that impede heat flow. However, when these materials become wet, water fills the air spaces, greatly increasing thermal conductivity and diminishing their insulating properties. This can lead to increased heat loss in buildings and other applications, making it crucial to manage moisture in insulation systems.