Standardization in the field of building and civil works, thermal and hygrothermal performance of materials, products, components, elements and systems, including completed buildings, new or existing, and their interaction with building technical systems, thermal insulation materials, products and systems for building and industrial applications, including insulation of equipment installed in buildings. It also covers methods for testing and calculating heat and moisture transfer and temperature and humidity conditions, energy consumption of buildings, including industrial built environment, heating loads and air conditioning of buildings, for natural lighting, ventilation and air infiltration, in-situ test methods relating to thermal, hygrothermal and energy performance of buildings and building components, input data for calculations, including climatic data, specifications for thermal insulation materials, products and systems, together with associated test methods and conformity criteria and terminology.