Building Thermography - Reporting and Interpretation of Results

摘要

The certification procedure for building thermographers in Finland was launched 2003, when also was published the first guidelines in interpretation of thermal images and reporting guidelines. After 12 years training courses a need has emerged to complement and modernize the interpretation and reporting, also to update what kind of thermal imagers can be used for various applications. Due to the technical progress, performance of devices has improved and image processing software have developed. The normal procedure is two-stage thermography in connection of air-tightness test. The templates for interpretation and reporting are often used as a minimum level, without proper information for the customer. Also there is still lack of knowledge in building physics, even it has weighted in training. Partially it is caused by varied background of thermographers. The outdoor and indoor conditions in the building are varying, too. In case of mechanical ventilation and mechanical exhaust, one must pay attention to pressure conditions. The ventilation system must be balanced or then switched off. The thermographers in field work should also take all possible factors into account effecting the surface temperatures - building envelope, heating and ventilation systems etc. In this paper the new guidelines are introduced, as well some examples of the most common errors of interpretation.