The project entails product development and tests of a method and product for drying and restoring water damage in floor constructions with cavity drainage constructions, e.g. Platonmatta. The method enables a radical shift from today's way of working, i.e. to tear up the floor structure to enable drying of the underlying foundation. By enabling restoration without demolition, this method provides both economic and environmental savings, and benefits in terms of drying time, total lead time and customer satisfaction.