What does dishing or cupping mean?

Dishing or cupping in PU-bound rubber granulate panels refers to the sinking of the central panel area and the slight lifting of its edges and corners. This phenomenon is typically a sign of improper installation on gravel, sand, or small stones. Under normal use, the loose material beneath the panels is gradually pushed towards the corners, causing the panel to sink in the middle and adapt to the shape of the underlying surface – similar to the shape of a soup plate. In the case of cheaper panels, poor construction can also be the cause. To avoid dishing or cupping, rubber granulate panels should not be laid directly on sand, gravel, or small stones. For installations without drainage, it is recommended to use a grass grid as a stable base.