INSULATING ELEMENT

An insulating element for sealing off a structural element in a motor vehicle includes a carrier and an expandable material that is arranged on the carrier. The insulating element has a top side and a bottom side, wherein at least three contact points are arranged on each of the top side and the bottom side, which are designed in such a way that, when a plurality of identical insulating elements are stacked, adjacent insulating elements respectively lie on one another via these contact points and are thus arranged parallel to one another.