Which air leakage reporting standard aims to ensure buildings are airtight?

The chosen answer is correct because ISO 9972:2015 specifically outlines the methodology for measuring the air permeability of buildings. This standard establishes protocols for airtightness testing, allowing for accurate assessments of a building's ability to prevent air leakage. By adhering to this standard, testing professionals can ensure that the buildings they assess meet specific airtightness criteria, which is critical for energy efficiency and indoor air quality.

ISO 9972:2015 provides guidelines for both the testing process and the reporting of results, ensuring that data is collected in a consistent manner across different buildings and projects. This is vital for achieving reliable and comparable results that can lead to improved building design and construction practices aimed at reducing energy waste and enhancing occupant comfort.

Other options may refer to standards related to building performance or energy efficiency, but they do not specifically focus on the methodology for measuring air leakage in the same comprehensive manner as ISO 9972:2015.