When we think about sandwich panels, our mind usually thinks of their best-known version, i.e. a construction material made of two layers, a PU core and equipped with joints and fasteners making it a simple and construction-friendly solution. In cold rooms and refrigerated storages, thermal dispersion is a critical point: especially on corners, the use of joints to connect panels creates thermal bridges affecting insulation properties. In fact, if junctions are not excellent and the panels not perfectly aligned, the outside temperature will affect the inside one with significant consequences on the cold room purpose and use and causing waste of energy. Corner panels are the perfect solutions to avoid this problem: the lack of fastening and joints eliminates any risk of thermal dispersion.