What key data points are necessary for ASTM E3158?

The key data points necessary for ASTM E3158 include specific baseline and post-baseline readings that are crucial for accurately assessing the airtightness of a building under test conditions. ASTM E3158 outlines a systematic approach for conducting airtightness tests, requiring a combination of baseline measurements and subsequent pressure readings to ensure the reliability of the results.

The method mandates that a number of pressure readings are taken at required time intervals. These pressure readings establish how the building reacts to controlled pressure changes, which is essential for determining airtightness. The inclusion of both baseline and post-baseline readings allows for a thorough analysis of the data collected during the test, supporting accurate calculations of air leakage rates and identifying potential leaks in the building envelope.

Thus, the correct choice encompasses all necessary elements, affirming the importance of gathering comprehensive data through a range of readings that create a reliable dataset for evaluating a building's airtightness according to the ASTM E3158 standard.