They differ only insignificantly from the frost protection layers. Depending on the requirements, they should be very dense in contrast to the frost protection layer (FSS). The main difference are the grading curve bandwidths, which permit only slight fluctuations.

RÖHRIGgranit^® offers a large number of base layers according to the relevant regulations. Depending on the specifications, they can be composed in such a way that they are very dense or also open-pored. The greatest advantages are the frost and de-icing salt resistance, as well as the high shear strength of the granite.