Insulation tile and method for its manufacture

An insulation tile having a first planar surface, a second planar surface and four side surfaces, the insulation tile consisting of:

• a casting compound layer having a first and a second surface and four side surfaces, and an insulation material layer having a first and a second surface and four side surfaces;
• the first surface of the casting compound layer forming the first planar surface of the tile and the second surface of the casting compound layer being adjacent to the first surface of the insulation material layer, and
• the first surface of the insulation layer having parallel grooves extending perpendicularly against two of the side surfaces of the insulation layer, and the second surface of the insulation material layer forming the second planar surface of the insulation tile;
• wherein the second surface of the casting compound layer extends partially into the grooves attaching the casting compound layer and the insulation material layer together and leaving a space between bottom of the grooves and the casting material layer forming ventilation channels inside the insulation material layer, and wherein
• the insulation material layer is made of extruded polystyrene (XPS), expanded polystyrene (EPS), polyurethane (PIR/PUR) or phenolic foam, the compression strength of which is at least 10 kPa.