True or False: Measuring air tightness to meet a performance target is a qualitative measure.

Measuring air tightness to meet a performance target is considered a quantitative measure. This means that it involves the collection of numerical data to assess the air infiltration rates in a building. Assessing air tightness typically involves using standardized tests, such as a blower door test, which quantifies the amount of air leakage in terms of volume per hour or similar metrics.

This quantitative approach allows for clear comparisons against established performance targets, making it possible to determine if a building meets specific energy efficiency or air quality standards. In contrast, qualitative measures would involve subjective assessments without numerical backing, which do not accurately reflect the airtightness performance of a building. Therefore, stating that measuring air tightness is a qualitative measure is incorrect.

This understanding highlights the importance of precise measurement in achieving building performance goals, emphasizing data-driven analysis in the field of building science.