LISTEN...

Air does many things to and in a building:

• Carries energy (i.e. heat), which can lead to higher energy costs if it is allowed to leak from our buildings.
• Carries moisture, which makes you feel more comfortable but could lead to condensation inside of assemblies
• Replaces stale with fresh as ventilation systems mix outside air with inside, exhausting stale air out. Humans need about 30 m³ (1060 ft³) per person per hour of fresh air.
• Can carry pollutants from outside to inside (e.g dust, pollen, smoke).

This is why we need Air Barriers and why our building code requires them.