本标准规定了一种定性方法，通过热成像检查，用于检测建筑信封中的热不规则。该方法最初用于识别构成建筑物外部信封的部件的热性质（包括气密性）的宽泛变化

This standard specifies a qualitative method, by thermographic examination, for detecting thermal irregularities in building envelopes. The method is used initially to identify wide variations in the thermal properties, including air tightness, of the components constituting the external envelopes of buildings.