Abstract: The disclosure relates to a thermal and/or acoustic insulation system as waterproofing for a flat or flat inclined outside surface of a building, especially for a flat roof or a flat inclined roof, consisting of at least one insulation element made of mineral wool, preferably made of stone 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 the major surface of the insulation element is free of protrusions, especially flights, and cavities thereby being planar and whereby the area connection between the insulation element and the lining element is at least 70%, preferably at least 80% of the major surface area of the insulation element.