Does ASTM E779 - 19 allow for single-point and two-point testing only?

ASTM E779 - 19 is a standard that provides methodologies for measuring the air leakage of buildings through pressurization and depressurization methods. This standard encompasses several testing approaches, which include single-point and two-point testing as well as multi-point testing.

Multi-point testing allows for a more comprehensive evaluation of a building's airtightness by conducting tests at various pressure differences or airflow rates. This method provides a broader data set, making it easier to identify patterns of air leakage across different sections of a building, enhancing the overall accuracy and reliability of the testing results.

By allowing multi-point testing in addition to single and two-point methods, ASTM E779 - 19 recognizes the importance of diverse testing strategies to assess building performance adequately. This flexibility is particularly important for complex building designs where a single measurement may not capture all potential air leakage issues.