Compound for laminated plasterboard. Inorganic load-based compound for the treatment of joints between Pladur system plasterboards and their subsequent fine layer skim plastering (average thickness 1 to 1.5 mm), to obtain a smooth, continuous surface, thus reducing the risk of marks and shadows, for a Eurogypsum and Atedy classification Q4 finish. It has the required additives for mixing with water before application. It is a setting compound, so it has a predetermined use time.