Tanking and Underground Works

Preventing the ingress of water or damp into underground premises is a problem often faced by building contractors. It needs to be taken into consideration from design stage onwards.
Performance requirements

The protection of underground walls against the action of water is a complex matter in design terms. To make a choice of a right solution, it is necessary to take into consideration the following aspects:

  • The water table, whose level may vary (rainfall, or high water levels in neighbouring water courses);
  • Groundwater runoff against or infiltration into the outer walls of the underground part of buildings;
  • Damp capillary rise, which can lead to water rising up walls;
  • Wind-blown rain on building facades;
  • Condensation of the water vapour contained in moist air in contact with walls that are cold.
Tanking Solutions

Teranap TP Tanking system is a certified system (BBA certificate n° 12/4934) that has been installed worldwide during the last 20 years.
Teranap TP Tanking System is a comprehensive system featuring Teranap 431 TP, elastomeric bitumen extra wide (4mm thick, 2 m wide) geomembrane, Parafor M3S covering strip on overlaps and Terastop waterbar for compartmentalization and injection.
The double protection of Teranap 431TP by polyester film surfacing and thick polyester reinforcement allows for looselaid application to the outer surfaces of the structure, withstanding permanent water pressure (up to 7 bars).
TERANAP TP Tanking system could also be installed in case of internal walls.

Siplast elastomeric bitumen Teranap TP geomembranes provide:
- Excellent resistance to ageing of the Teranap TP geomembrane due to the elastomeric bitumen compound enabling the material to retain its elasticity for extensive periods;
- High level of mechanical properties, especially resistance to puncturing due to the double protection by polyester film surfacing and a thick polyester fabric reinforcement;
- Easier application by torching for anchoring and joining works to concrete structures.
- Elongation and flexibility for all details treatment (expansion joints, pile caps, etc...)
- High chemical resistance to the most common potentially harmful chemicals present in the ground.
- Compartmentalization and injection system.

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