diffusionsåbne

Diffusionsåbne refers to a property of building materials that allows water vapor to pass through them. This characteristic is crucial in construction for managing moisture within a building envelope. Materials that are diffusionsåbne permit water vapor to escape from the interior of a building to the exterior, preventing condensation from forming within the wall or roof structure. This is achieved because the material has a high water vapor diffusion resistance factor (Sd-value). A low Sd-value indicates that the material is more permeable to water vapor.

The concept of diffusion openness is particularly important in strategies for creating energy-efficient and durable buildings, especially those aiming for passive house standards. By allowing moisture to escape, diffusionsåbne materials help to maintain the thermal insulation properties of building components, as moisture can significantly reduce insulation effectiveness. Furthermore, preventing moisture buildup is essential for avoiding mold growth and structural damage. Common examples of diffusionsåbne materials include certain types of insulation, membranes, and wood-based boards. The careful selection and layering of materials with appropriate diffusion properties are key to designing a healthy and long-lasting building.