The invention relates to a method for sealing an above-ground or underground construction. In particular, the method comprises the use of non-reactive hot-melt adhesives and flexible polyolefin films. In particular, said method has the advantages that good, long-lasting adhesion can be quickly achieved and that sealing strips that are tack-free at room temperature and that can be processed and glued easily at the construction site are obtained in a simple manner, in particular by using polyolefin strips that are coated with non-reactive hot-melt adhesives.