Facing element for a building

An insulation board (1) for a wall of a building, comprising:

• an inner boundary surface (2) facing towards the wall and the building and an outer boundary surface (3) facing away from the wall and the building;
• a cavity (6) formed between the inner boundary surface (2) and the outer boundary surface (3);
• wherein the cavity (6) extends from a lower boundary surface (4) of the insulation board (1) up to an upper boundary surface (5) of the insulation board (1);
• at least one perforation (7, 7′) extending from the inner boundary surface (2) facing the wall to the cavity (6);
• and
• an inner part (8) facing the building and an outer part (9) of the insulation board (1) are spaced apart from one another by spacers (10) to form the cavity (6), wherein the spacers are discrete protuberances (10),
• wherein the discrete protuberances (10) that are closest to the edges of the insulation board are the outermost protuberances and are located a distance to the edges of the insulation board (1) and
• wherein the at least one perforation (7, 7′) extends through the inner part (8) from the inner boundary surface (2) facing and adjacent to the wall to an exterior surface (2′) of the inner part (8) facing away from the wall and into the cavity (6).