When to Use Permeable vs Non-Permeable Air Barriers

High-performing, energy-efficient homes require a tight building envelope that prevents air (and moisture) from infiltrating the wall system. Air infiltration into a house can lead to significant energy loss. It will also cause condensation (moisture) to collect in the walls, resulting in structurally damaging and unhealthy mold and rot. The International Residential Code (IRC) requires weather-resistant barriers for most homes to prevent air- and moisture infiltration.