Abstract: The present invention relates to a thin slab of plastic material adapted to cover the terraces of buildings.Thin slab of plastic material adapted to cover the terraces of buildings, particularly for use in covering arrangements of the type of thin slabs on blocks, characterized in that it has, on the one hand, on its undersurface, a partitioned structure constituted by recesses or depressions (1) and partitions (5), on the other hand, a border (2) at its periphery, and, finally, on its upper surface, a flange (6) defining a space (7) adapted to receive a surface coating, as well as, on its lateral surfaces, means (3, 10) permitting assembly with adjacent thin slabs.

Abstract: Process for producing airtight sealing of buildings, characterized in that it consists in causing to adhere fully on the zone to be treated a manfactured sheet of constant thickness comprising a reinforcement of organc fibres covered in a mass of bituminous binder, so as to produce a continuous dressing, whatever the nature and the shape of the substrate.