Compound for laminated plasterboard. Inorganic load-based powder, whose special additives permit mixing with water to obtain a joint compound for applying to laminated plasterboard systems. It incorporates a water repellent that provides resistance to humidity for use in indoor zones with greater exposure to high humidity levels (such as bathrooms and kitchens). The resulting compound hardens by drying in contact with air. Drying time varies depending on the atmospheric conditions in which it is applied, ranging from 12 to 48 hours (higher temperatures and lower humidity means longer drying times).