The wider the upper flange of a wall cladding element, such as FischerPANEEL, the more precisely the substructure must be aligned.

Even a substructure that is aligned in the plane, but where the flanges are twisted, causes problems.
Such substructures can lead to longitudinal waves in the wide belts of the installed panels. (Picture 2 + 3)
If you already suspect that the planned substructure is not exactly flush e.g. with the outer, narrow flanges of the liner tray profiles, a greater sheet thickness of the panels of 0.88 or even 1.0 mm must be recommended.

It is also important to point out that lateral pressure and tension on the panels during installation will cause convex or concave deformation. (Picture 1)

There have been some examples where it was possible to prove that unassembled elements are flat by removing uneven wall elements and placing them on a flat surface.

On page 7 of our FischerPANEEL brochure you will find the following:

When installing the FischerPANEEL, there must be no load on the panels in the transverse direction during screwing, because lateral tension means concave deformation and lateral pressure means convex deformation of the wide upper chords and thus an optical impairment.

In this respect, it is advisable to place a guide rail over the four upper chords during bolting to ensure that neither convex nor concave deformations occur in the transverse direction.

Picture 1: Tension or pressure in the transverse direction of the panel produces concave or convex transverse deformations (extreme example)
Picture 2: Concave deformation in longitudinal direction may lead to longitudinal waves
Picture 3: The example of this panel lying freely on pallets shows that bending due to its own weight creates waves in the longitudinal direction.

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