In order to ensure the building envelope is meeting performance requirements, whole building air barrier testing may be conducted. Air barrier testing can identify leakage and the airflow paths, which illustrate the potential amount of energy lost.
Standard test ASTM E779, is conducted using orifice blower door fans that induce a series of positive and negative pressures on the building envelope.
We do not want the tested air leakage to exceed 0.40 cfm/ft2 at 75 pa. If the air leakage exceeds the limit, we conduct: