Anhydrite screed offers numerous benefits. A particularly important one for the floor covering industry is that the edges do not ride up and large areas can be laid with virtually no joints. These properties were used to positive effect in the Rhineland Regional State Association's building project at the abbey in Brauweiler near Cologne. The screed here had to be laid exactly five millimetres below the metal rails for a sliding shelving system, as the top surface, a rubber coating, had to be flush with the upper edge of the rails. Unevenness caused by the screed riding up and level discrepancies at the joints, inevitable with a cement screed, would subsequently have prevented the filing cabinets sliding smoothly.
Stanislaus Lampret of Kürten in the Rheinisch-Bergisch district, a specialist screed laying company of 30 years' standing, used its experience to persuade the building owners to use conventional anhydrite screed formulated with the binder Bayer Anhydritbinder AB 20 from Bayer Chemicals AG of Leverkusen instead of the planned cement screed.
Around 1,600 square metres of screed were laid in the Rhineland Regional State Association's archive in the abbey. Twelve 20-metre-long rails divide this surface up into 1.5-metre-wide strips; the conventional anhydrite screed was applied over the whole length without a joint and so that it lay accurately against the rails.