Koster Deuxan 2C - Cold applied polymer modified bitumen waterproof coating

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The object content is configured for use in UK, but it may also be suitable for use in other locations.



  • Polystyrene-free, fibrated and polymer modified.
  • Bridges substrate cracks safely and against pressurized water.
  • Radon-proof.


  • Designed for the safe and permanent outside waterproofing of basement walls, foundations, floor plates, etc.
  • For intermediate waterproofing of balconies and terraces.
  • Also suitable for the intermediate waterproofing underneath screeds and for bonding insulation and drainage boards.


  • Mineral substrates: Köster Polysil® TG 500.
  • Polystyrene substrates: No primer necessary.


Embed Köster Glass Fibre Mesh at corners, fillets and areas strongly in danger of cracking.

Expansion joints:

Seal expansion joints by applying Köster Special Joint Tape in the joint areas of the thick film sealant.


  • Prior to backfilling, the fully cured coating must be protected from mechanical damage.
  • The use of Delta Geo-Drain Quattro Protection and Drainage Sheet is recommended.
  • Polystyrene drainage boards, perimeter insulation, etc. can be spot-bonded.
  • Bond protection boards with Köster Deuxan® 2C.
Platform Compatible Version Certified to
IFC IFC - 1 2.0
Revit Revit 2016 + 2 2.0

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