A method for producing a thermal and/or acoustic insulation system as waterproofing for a flat or flat inclined outside surface of a building consisting of at least one insulation element made of mineral wool and having a major surface, and a lining element consisting of at least a first layer made of lining material and a second layer made of a glue activatable by heat and oriented to the major surface of the insulation element, whereby protrusions and cavities are removed from the major surface of the insulation element so that the major surface is planar, whereby the insulation element is placed on the outside surface of the building with the planar surface being oriented distant from the outside surface of the building, whereby the lining element is placed on the planar surface of the insulation element with its layer of glue being at least partly in contact with the major surface of the insulation element and whereby the glue is heated up to its melting temperature.