This solution requires some experience and is especially for difficult coverings, i.e. for lightweight outer (painted) panels. The variant is very flexible because it can be attached almost anywhere, but the mounting effort is relatively high. Usually, an outer surface and a further internal panel, a cavity in between are a prerequisite of approx. 4-8 cm, which can be empty or filled with insulating material. Such structures were typical for pre-fab lightweight buildings between 1960 and 1980.

In the case of a section of the wall, three panels would appear, an inner one (made of plasterboard), an outer one consisting of fiber cement or the like, and a middle one, which is counted as the outer skin. In exceptional cases, a strong panel on the outside with a cavity behind it is sufficient. In this case, however, it should be noted that then all load is applied to only one panel and deformations may occur.

In the ideal case, there are 2 consecutive panels with a cavity. If there is a (foamed) insulation layer instead of a cavity, as much insulating material as possible is milled away from the outside by means of a drilling machine that creates as large a cavity as possible around the fastening axis. Then, a screen sleeve SD 16085 is placed so that it allows the second inner panel to be gripped, then the screen sleeve and the surrounding cavity are filled with composite mortar and a cross holder WH 10151, WH 08111 or WM 08133 is pressed in and glued. Alternatively, the corresponding dowels can also be glued into the screen sleeve, then the cross-holder can be detached again as required. The adhesive should not be applied sparingly; it is best to use a complete cartridge of mortar per attachment point. After bonding, a pressure-resistant composite of the two panels or at least a 'pile' is produced behind the outer panel, which allows the cross-holder to be braced at all by help of the disk and the adjusting nut.