Very dimensionally stable, special underlay without adhesive coating for the reliable, residue-free, reversible installation of textile and CV sheeting. It reliably protects the substrate from soiling and contamination of adhesives. Can be used on virtually all types of wear surfaces such as PVC, CV, quartz vinyl tiles, wood floors, stone and ceramic floors, linoleum, carpeting and needle punch coverings. Naturally, it can also be installed on chipboards, levelled screeds, sufficiently levelled deal floors as well as on all substrates ready for covering.