How many pre and post baseline measurements are required by ASTM E779 - 19?

The requirement for baseline measurements in accordance with ASTM E779 - 19 specifies that a total of 10 measurements must be taken to establish both pre and post baselines. This is critical because accurate baseline data is essential for determining the building's airtightness before and after any testing or interventions are conducted.

Each set of measurements contributes to a more reliable assessment of the building's performance, ensuring that any changes in airtightness can be accurately attributed to specific factors or modifications. This protocol helps to maintain consistency and reliability in testing results, ultimately leading to better performance evaluations.

The number of measurements is designed to provide sufficient data to account for any variations that might occur due to environmental factors or testing discrepancies, ensuring a robust dataset for analysis.