Abstract: An insulation wall is constructed from insulation plates. The edge sides of the insulation plates are provided with edge connecting elements such as a tongue, a groove or a ridge for forming a tongue and groove joint or a half lap joint between adjacent insulation plates in the insulation wall. At least one drainage channel is provided through the insulation wall for draining away moisture that has penetrated between the insulation plates into the insulation wall. This at least one drainage channel includes adjoining drainage channel sections which are provided in the longitudinal direction on the edge connecting elements of the interconnected insulation plates.