Thermal Insulation Board

A thermal insulation board for use in thermal insulation of a structure, comprising a first face and a second face opposite to the first face, the insulation board having a thickness of thermal insulation material between the first face and the second face defining the thermal insulation direction of the board, wherein the insulation board comprises one or more gas channels formed to the insulation material and extending between the first face and the second face, each gas channel having a first end and a second end, and at least one of the first end and the second end is closed preventing gas flow via said channel end, and that the one or more gas channels are arranged at least partly to an angled orientation such that the first end of the channel residing closer to the first face is vertically lower, in a usage position of the thermal insulation board, than the second end of the gas channel residing closer to the second face of the insulation board.