What does permeability measure in a material?

Permeability measures the ease with which water can penetrate or pass through a material. This property is crucial in roofing and construction as it directly impacts water resistance and overall durability. A high permeability indicates that water can easily pass through, which may not be desirable in roofing materials where water infiltration can lead to issues like structural damage or mold growth. Conversely, low permeability suggests that a material is more effective at resisting water, thus enhancing the integrity and longevity of roofing systems. Understanding a material’s permeability is essential for selecting appropriate materials based on their intended use in roofing applications.