A thermal-insulation and drying panel having a shape composed of two essentially cuboid layers: an inner layer and an outer layer, said layers (2, 3) being offset with respect to each other along two perpendicular edges and constitute an integral element, whereby in a transition area of outer layer into inner layer a displacement region is present, wherein a first side of the inner layer is designed to contact an insulated wall, and the other side of the outer layer which is not in contact with the inner layer, in an assembled state is arranged to face the surroundings of the insulated wall and is designed to be covered with a finishing material, whereby the panel sides other than the first side and the second side constitute side walls of the panel, whereby in the inner layer, at the first side designed to contact the insulated wall, ventilation slots are spaced at regular intervals, and parallel to each other, extending perpendicularly to longer sides of the panel, whereby lower portions of slots are extended so that along the run of ventilation slots within a single thermal-insulation and drying panel ventilation slots comprise, starting from the bottom, an extended portion of an essentially constant width, a contracting portion of a variable width and a non-extended portion of an essentially constant width, whereby in the displacement region between the inner layer and the outer layer, oblong splines and keys are provided, extending along side walls of the thermal-insulation and drying panel, whereby a horizontal key is extending along an upper edge of the outer layer, while a vertical key is extending along a right edge of outer layer, when viewed from the outer side of the thermal-insulation and drying panel, whereby a horizontal spline is extending along a lower edge of the outer layer, so that extensions of ventilation slots pass therethrough, while a vertical spline is extending along a left edge of the outer layer, when viewed from the outer side of the thermal-insulation and drying panel, whereby all oblong keys (10, 11) and splines (12, 13) have slightly convergent cross-section, whereby a depth of the horizontal key in the thermal-insulation and drying panel is greater than a length of the horizontal spline, whereby at surface portions of the inner layer uncovered by the outer layer, cavities for fixing elements are provided for fixing the thermal-insulation and drying panel to the insulated wall, characterised in that the lower surface of the horizontal key is additionally deepened towards the lower edge of the thermal-insulation and drying panel, whereby said deepening forms a ventilation duct, extending essentially perpendicularly to the ventilation slots, which contact the ventilation duct at least at the half height of the ventilation duct measured from a bottom of the duct, and preferably contact the ventilation duct at least at a section being 0.6 times the height of the ventilation duct. whereby in a transition area of outer layer into inner layer a displacement region is present, wherein a first side of the inner layer is designed to contact an insulated wall, and the other side of the outer layer which is not in contact with the inner layer, in an assembled state is arranged to face the surroundings of the insulated wall and is designed to be covered with a finishing material, whereby the panel sides other than the first side and the second side constitute side walls of the panel, whereby in the inner layer, at the first side designed to contact the insulated wall, ventilation slots are spaced at regular intervals, and parallel to each other, extending perpendicularly to longer sides of the panel, whereby lower portions of slots are extended so that along the run of ventilation slots within a single thermal-insulation and drying panel ventilation slots comprise, starting from the bottom, an extended portion of an essentially constant width, a contracting portion of a variable width and a non-extended portion of an essentially constant width, whereby in the displacement region between the inner layer and the outer layer, oblong splines and keys are provided, extending along side walls of the thermal-insulation and drying panel, whereby a horizontal key is extending along an upper edge of the outer layer, while a vertical key is extending along a right edge of outer layer, when viewed from the outer side of the thermal-insulation and drying panel, whereby a horizontal spline is extending along a lower edge of the outer layer, so that extensions of ventilation slots pass therethrough, while a vertical spline is extending along a left edge of the outer layer, when viewed from the outer side of the thermal-insulation and drying panel, whereby all oblong keys (10, 11) and splines (12, 13) have slightly convergent cross-section, whereby a depth of the horizontal key in the thermal-insulation and drying panel is greater than a length of the horizontal spline, whereby at surface portions of the inner layer uncovered by the outer layer, cavities for fixing elements are provided for fixing the thermal-insulation and drying panel to the insulated wall, characterised in that the lower surface of the horizontal key is additionally deepened towards the lower edge of the thermal-insulation and drying panel, whereby said deepening forms a ventilation duct, extending essentially perpendicularly to the ventilation slots, which contact the ventilation duct at least at the half height of the ventilation duct measured from a bottom of the duct, and preferably contact the ventilation duct at least at a section being 0.6 times the height of the ventilation duct.