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2. Surface containment
2.1 General principle
The surface covering is generally made up of a multi-layer device consisting of superimposed elements which are, from top to bottom (figure 5 ):
a surface layer ;
a protective layer ;
a rainwater drainage layer;
a sealing layer ;
a foundation layer for the upper elements of the roof, to ensure gas drainage if necessary.
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The surface layer
Its role is to separate the underlying layers of cover from the atmosphere....
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Surface containment
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