Vapor-permeable

A vapor-permeable construction allows moisture (water vapor) to pass through the building materials in a controlled way. Instead of trapping humidity inside the walls, the structure can “breathe,” letting moisture escape while still keeping out rain and wind.

Why it matters:

• Prevents condensation and mold growth inside the walls.
• Helps natural materials like wood, clay, or wool stay healthy and durable.
• Creates a more balanced indoor climate without relying only on mechanical ventilation.