Which method is utilized for determining the airtightness of buildings?

The method utilized for determining the airtightness of buildings is ASTM E779. This standard outlines a procedure for measuring the air leakage rate of buildings under a specified pressure difference, which is critical for evaluating energy efficiency and overall building performance. ASTM E779 provides a systematic approach to quantify air infiltration rates and assists in identifying areas where improvements can be made, thereby supporting compliance with energy codes like ASHRAE 90.1 and LEED certification requirements.

While other standards, such as ASTM E1827, may involve air leakage testing, they focus more on specific scenarios or different methodologies. CEN Nondestructive Leak Testing is primarily relevant in a European context and may not directly correlate with the common practices used in LEED certification for airtightness evaluation in buildings. RESNET Standards primarily relate to home energy ratings and do not specifically address the testing for building airtightness as outlined in ASTM E779.