This European Standard applies to prefabricated walk-in cold room kits and components. It provides test or calculation methods to assess thermal insulation performances. Performance characteristics of Walk-in cold rooms are assessed in terms of thermal insulating properties, in order to give a basis on which assessing Energy Consumption related properties of Walk-in cold rooms, and of their components. Performance Characteristics will be assessed for every single component of the Walk-in cold room, and for the assembled Walk-in cold room as a whole. This European Standard provides also a guide for installation.