| 摘要 |
<p>A multilayer sheath (1), particularly for insulating walls and lofts of buildings, comprising a first lower protective layer (2) and a second upper protective layer (3), which are impermeable to water and water vapor, and between which there are means (5), which can be activated upon contact with water or water vapor, that are adapted to restore the waterproofness of the sheath (1) at discontinuities or damaged regions of the first or second protective layers (2, 3).
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