Koster KBE Liquid Film - Highly Elastic, Solvent-Free, Rubber/Bitumen Membrane - W 245

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Solvent-free, highly elastic bitumen / rubber based sealing compound. For high quality external waterproofing of construction members in ground contact, such as basements. Also suitable for waterproofing under protective screed (so called sandwich waterproofing), crack bridging waterproofing of concrete floors, flat roofs and much more. Elongation: > 900 %.

Unit Sizes

13.2 lb bucket (W 245 006)
52.8 lb pail (W 245 024)

Fields of Application For foundation waterproofing and intermediate waterproofing on horizontal areas such as terraces, balconies, wet and moist rooms (under screeds), for priming and for sealing the seams and edges of KOSTER KSK waterproofing membranes in above and below ground construction, and garages.

Elastic Waterproofing Of Areas In Ground Contact
KOSTER KBE Liquid Film is ideal for application over plaster or concrete, flush jointed masonry or KOSTER NB 1 Grey. Voids, open joints, etc. have to be closed prior to application using, for example, KOSTER Repair Mortar. In the area of wall/floor junctions, on construction joints and especially in areas at risk of cracking, KOSTER Glass Fiber Mesh or KOSTER Flex Fabric, has to be embedded into the fresh first layer. Prior to backfilling, the coating has to be protected against mechanical damage, for example with KOSTER Protection and Drainage Sheet 3-400. The installation of a suitable drainage system is also recommended. KOSTER KBE Liquid Film is also suitable for waterproofing floor areas against rising damp. Expose the coating to stresses such as movement, water etc., only after the waterproofing layer has completely dried. On horizontal areas, two layers of PE-foil are placed as a gliding layer on top of the cured waterproofing layer before the screed is installed.

Balconies and terraces
KOSTER KBE Liquid Film is especially suited for waterproofing balconies and terraces. Waterproofing drains, around downspouts and gutter connections can be applied in one seamless application without complicated detailing work. Embed KOSTER Glass Fiber Mesh or KOSTER Flex Fabric into the fresh first layer of KOSTER KBE Liquid Film over the entire area as well as at all connections. In cases of extreme joint movement or at wall / floor junctions, embed KOSTER BD Flex Tape K 120. On top of the fully dried KBE Liquid Film coating, place two layers of 16 mil polyethylene sheet as a gliding layer. Afterwards, install a reinforced screed at a min. layer thickness of 1.25 inches



KOSTER American Corporation is a subsidiary of KOSTER Bauchemie AG of Germany.

Founded in 1982 KÖSTER BAUCHEMIE AG specializes in the development and production of high-quality waterproofing products and systems. Today, KÖSTER forms a group of more than 20 companies with worldwide activities in more than 50 countries. Its headquarters are located in Aurich, Germany.

Our R&D facility, production and technical department are all located on the same campus in Virginia Beach, VA. This allows each department to work closely together to ensure each product conforms to the highest standards of quality. 

KOSTER operates two production facilities in Virginia Beach. The liquid facility produces all of our epoxy coatings while the powder facility produces our self-leveling underlayments as well as other cementitious waterproofing products. 

We place tremendous value on producing our products ourselves in order to ensure the highest level of quality control from development to application. We strongly believe in providing our customers with an excellent and safe experience with our products.