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


  • 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.

General information




KÖSTER Deuxan 2C is a two component, polystyrene-free, fibrated, polymer modified bitumen thick film sealant for the secure waterproofing of building structures. The coating bridges cracks in the substrate against pressurized water. KÖSTER Deuxan2C is radonproof


Bitumen rubber with a reactive powder

Uniclass 2015

Pr_35_31_68_17 Cold-applied polymer-modified bitumen waterproof coatingsPrimary


J30/10 Cold applied damp proofing

J30/110 Cold applied tanking . . . . . .

J30/130 Cold applied damp proofing . . . . . .

Specification data - Cold-applied polymer-modified bitumen waterproof coatings

Product Reference

Köster Deuxan® 2C

Standard product features


Bitumen/ Rubber with a reactive powder.

Coating system:

Two layers.

Dry layer thickness (minimum):

  • Waterproofing against ground moisture, non-retained seepage or non-pressurized water: 3 mm (4 mm wet layer thickness at 4.0 kg/m²).
  • Waterproofing against retained seepage: 4 mm (6 mm wet layer thickness at 6 kg/m²).

Mixture density:

1.07 g/cm³.

Heat resistance:


Waterproof after full cure (DIN 1048–5):

< 5 bar.

Curing time (at 20°C):

Approximately 24 hours.

Application temperature:

  • Ambient: 5–35°C.
  • Substrate: 5–30°C.

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