Surface containment
Containment of polluted sites

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.

• The surface layer

  Its role is to separate the underlying layers of cover from the atmosphere. It must resist erosion by wind and water, and minimize the influence of atmospheric conditions.

  The most commonly used materials are: topsoil alone...