If the solid wall is sufficiently level, one-piece substructures can be used.

However, it should be noted that each trade must or may move within the respective permissible tolerances.

So carcass works have relatively large permissible tolerances.

If the solid wall to be cladded consists of masonry, a permissible unevenness of 10mm applies in accordance with DIN 18202, Table 3, Line 5 "Non-surface finished walls and undersides of ceilings with e.g. 1 meter measuring point distance.

According to 18202, Table 3, Line 6 " Finished walls and undersides of ceilings, e.g. plastered walls, wall coverings, suspended ceilings", the permissible tolerance for finished wall surfaces is only 5 mmm at 1 meter measuring point distance.

This means that the builder of a wall covering, e.g. from trapezoidal profiles, must be able to compensate for the possible larger, permissible tolerances of the solid wall. This is hardly possible with one-piece substructures, but here, for example, one must work with 2 Z-profiles or consoles and continuous profiles.

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