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: Sealing system for roofs by means of two successive sealing layers. The first sealing layer is mechanically attached to the support and the second, self-adhesive, sealing layer is attached to the first sealing layer by cold self-adhesion. The first sealing layer comprises sealing sheets made up by the assembling of one asphalt-base sheet reinforced by an armature and of a film of a polymer having a high tear resistance.

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.