How does moisture impact the insulating properties of materials?

Moisture significantly decreases the thermal resistance of insulation materials. When insulation becomes wet, its ability to resist heat transfer diminishes because water conducts heat much more effectively than dry air, which is a common insulating component. This leads to a reduced overall insulating performance, meaning that the insulated space can become less energy-efficient, allowing heat to escape in the winter and enter in the summer more easily. Therefore, the presence of moisture compromises the effectiveness of the insulation material, leading to higher energy costs and potential issues with comfort within the building. Understanding this impact is crucial for building analysts when evaluating insulation systems and ensuring energy efficiency in buildings.