This European Standard provides test or calculation methods to assess thermal insulation performances for customized walk-in cold rooms and components under normal end-use conditions. The normal end-use conditions of a walk-in cold room are considered to be: installation inside an existing building; not exposed to external weather conditions; internal side of panels subject to temperatures within the indicative range "40 °C d" T d" 12 °C; external side of panels subject to temperatures within the indicative range "8 °C d" T d" 30 °C; temperatures below 0 °C, or higher than 20 °C, can be reached if the walk-in cold room is located inside not air-conditioned premises. NOTE In case the customized walk-in cold room working at medium storage temperature is used as a food processing room or a clean room, the standard is applied.