Which standard does not include an option for multi-point testing?

The correct answer identifies a standard that does not provide an option for multi-point testing. ASTM E1827 is specifically focused on the testing method for airtightness of buildings, allowing for the measurement of air leakage when using a blower door test, but it does not provide provisions for conducting tests at multiple pressure points.

In contrast, ASTM E779, ISO 9972, and USACE 2012 all include methodologies that can accommodate multi-point testing, which allows for a more nuanced understanding of a building's airtightness performance by measuring at various pressure levels. This can provide valuable data for assessing how a building behaves under different conditions and helps in identifying specific leakage areas more accurately.

Understanding the options available within different standards is crucial for professionals involved in building performance testing, as the choice of methodology directly impacts the quality of the results obtained and the subsequent decisions made regarding building envelope performance.