Air Pressure Testing.  Air permeability tests the uncontrolled flow / leakage of air through the envelope cavities that can be created by structural damage, poor workmanship, weather, design or deterioration of materials.

Air Pressure Testing. Air permeability tests the uncontrolled flow / leakage of air through the envelope cavities that can be created by structural damage, poor workmanship, weather, design or deterioration of materials.