A device for the positioning and the re-tensioning of waterproof material in sheets, on a surfaces to be protected, characterized in that it comprises a first outer reeling element, in the shape of a channel, a second internal restraining element, arranged longitudinally to the previous one, and means for fixing one of said restraining elements to the surface to be protected, said device also comprising means for connecting and for bringing the elements of tensioning together, retaining and tensioning the sheets of material arranged against the surface to be protected and interposed between the said elements of prestressing. (Machine-translation by Google Translate, not legally binding)
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