What is the default air tightness standard used in European countries?

The default air tightness standard used in many European countries is ISO 9972:2015. This standard specifies the methodology for measuring the air permeability of buildings, which is critical for assessing energy performance and ensuring the structural integrity of the building envelope. ISO 9972:2015 provides guidelines and test procedures for determining the air leakage rate under standardized conditions, helping professionals ensure compliance with regulations aimed at reducing energy loss and enhancing indoor air quality.

Understanding this standard is particularly important in the context of building design, construction, and renovation, as it helps identify areas where improvements can be made to minimize air infiltration and exfiltration. The standard aligns with broader European initiatives aimed at improving energy efficiency in buildings, which is a priority in many regions due to environmental concerns and energy conservation mandates.